// Components for manipulating sequences of characters -*- C++ -*- // Copyright (C) 1997-2020 Free Software Foundation, Inc. // // This file is part of the GNU ISO C++ Library. This library is free // software; you can redistribute it and/or modify it under the // terms of the GNU General Public License as published by the // Free Software Foundation; either version 3, or (at your option) // any later version. // This library is distributed in the hope that it will be useful, // but WITHOUT ANY WARRANTY; without even the implied warranty of // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the // GNU General Public License for more details. // Under Section 7 of GPL version 3, you are granted additional // permissions described in the GCC Runtime Library Exception, version // 3.1, as published by the Free Software Foundation. // You should have received a copy of the GNU General Public License and // a copy of the GCC Runtime Library Exception along with this program; // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see // <http://www.gnu.org/licenses/>. /** @file bits/basic_string.h * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{string} */ // // ISO C++ 14882: 21 Strings library // #ifndef _BASIC_STRING_H #define _BASIC_STRING_H 1 #pragma GCC system_header #include <ext/atomicity.h> #include <ext/alloc_traits.h> #include <debug/debug.h> #if __cplusplus >= 201103L #include <initializer_list> #endif #if __cplusplus >= 201703L # include <string_view> #endif namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION #if _GLIBCXX_USE_CXX11_ABI _GLIBCXX_BEGIN_NAMESPACE_CXX11 /** * @class basic_string basic_string.h <string> * @brief Managing sequences of characters and character-like objects. * * @ingroup strings * @ingroup sequences * * @tparam _CharT Type of character * @tparam _Traits Traits for character type, defaults to * char_traits<_CharT>. * @tparam _Alloc Allocator type, defaults to allocator<_CharT>. * * Meets the requirements of a <a href="tables.html#65">container</a>, a * <a href="tables.html#66">reversible container</a>, and a * <a href="tables.html#67">sequence</a>. Of the * <a href="tables.html#68">optional sequence requirements</a>, only * @c push_back, @c at, and @c %array access are supported. */ template<typename _CharT, typename _Traits, typename _Alloc> class basic_string { typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template rebind<_CharT>::other _Char_alloc_type; typedef __gnu_cxx::__alloc_traits<_Char_alloc_type> _Alloc_traits; // Types: public: typedef _Traits traits_type; typedef typename _Traits::char_type value_type; typedef _Char_alloc_type allocator_type; typedef typename _Alloc_traits::size_type size_type; typedef typename _Alloc_traits::difference_type difference_type; typedef typename _Alloc_traits::reference reference; typedef typename _Alloc_traits::const_reference const_reference; typedef typename _Alloc_traits::pointer pointer; typedef typename _Alloc_traits::const_pointer const_pointer; typedef __gnu_cxx::__normal_iterator<pointer, basic_string> iterator; typedef __gnu_cxx::__normal_iterator<const_pointer, basic_string> const_iterator; typedef std::reverse_iterator<const_iterator> const_reverse_iterator; typedef std::reverse_iterator<iterator> reverse_iterator; /// Value returned by various member functions when they fail. static const size_type npos = static_cast<size_type>(-1); protected: // type used for positions in insert, erase etc. #if __cplusplus < 201103L typedef iterator __const_iterator; #else typedef const_iterator __const_iterator; #endif private: #if __cplusplus >= 201703L // A helper type for avoiding boiler-plate. typedef basic_string_view<_CharT, _Traits> __sv_type; template<typename _Tp, typename _Res> using _If_sv = enable_if_t< __and_<is_convertible<const _Tp&, __sv_type>, __not_<is_convertible<const _Tp*, const basic_string*>>, __not_<is_convertible<const _Tp&, const _CharT*>>>::value, _Res>; // Allows an implicit conversion to __sv_type. static __sv_type _S_to_string_view(__sv_type __svt) noexcept { return __svt; } // Wraps a string_view by explicit conversion and thus // allows to add an internal constructor that does not // participate in overload resolution when a string_view // is provided. struct __sv_wrapper { explicit __sv_wrapper(__sv_type __sv) noexcept : _M_sv(__sv) { } __sv_type _M_sv; }; /** * @brief Only internally used: Construct string from a string view * wrapper. * @param __svw string view wrapper. * @param __a Allocator to use. */ explicit basic_string(__sv_wrapper __svw, const _Alloc& __a) : basic_string(__svw._M_sv.data(), __svw._M_sv.size(), __a) { } #endif // Use empty-base optimization: http://www.cantrip.org/emptyopt.html struct _Alloc_hider : allocator_type // TODO check __is_final { #if __cplusplus < 201103L _Alloc_hider(pointer __dat, const _Alloc& __a = _Alloc()) : allocator_type(__a), _M_p(__dat) { } #else _Alloc_hider(pointer __dat, const _Alloc& __a) : allocator_type(__a), _M_p(__dat) { } _Alloc_hider(pointer __dat, _Alloc&& __a = _Alloc()) : allocator_type(std::move(__a)), _M_p(__dat) { } #endif pointer _M_p; // The actual data. }; _Alloc_hider _M_dataplus; size_type _M_string_length; enum { _S_local_capacity = 15 / sizeof(_CharT) }; union { _CharT _M_local_buf[_S_local_capacity + 1]; size_type _M_allocated_capacity; }; void _M_data(pointer __p) { _M_dataplus._M_p = __p; } void _M_length(size_type __length) { _M_string_length = __length; } pointer _M_data() const { return _M_dataplus._M_p; } pointer _M_local_data() { #if __cplusplus >= 201103L return std::pointer_traits<pointer>::pointer_to(*_M_local_buf); #else return pointer(_M_local_buf); #endif } const_pointer _M_local_data() const { #if __cplusplus >= 201103L return std::pointer_traits<const_pointer>::pointer_to(*_M_local_buf); #else return const_pointer(_M_local_buf); #endif } void _M_capacity(size_type __capacity) { _M_allocated_capacity = __capacity; } void _M_set_length(size_type __n) { _M_length(__n); traits_type::assign(_M_data()[__n], _CharT()); } bool _M_is_local() const { return _M_data() == _M_local_data(); } // Create & Destroy pointer _M_create(size_type&, size_type); void _M_dispose() { if (!_M_is_local()) _M_destroy(_M_allocated_capacity); } void _M_destroy(size_type __size) throw() { _Alloc_traits::deallocate(_M_get_allocator(), _M_data(), __size + 1); } // _M_construct_aux is used to implement the 21.3.1 para 15 which // requires special behaviour if _InIterator is an integral type template<typename _InIterator> void _M_construct_aux(_InIterator __beg, _InIterator __end, std::__false_type) { typedef typename iterator_traits<_InIterator>::iterator_category _Tag; _M_construct(__beg, __end, _Tag()); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 438. Ambiguity in the "do the right thing" clause template<typename _Integer> void _M_construct_aux(_Integer __beg, _Integer __end, std::__true_type) { _M_construct_aux_2(static_cast<size_type>(__beg), __end); } void _M_construct_aux_2(size_type __req, _CharT __c) { _M_construct(__req, __c); } template<typename _InIterator> void _M_construct(_InIterator __beg, _InIterator __end) { typedef typename std::__is_integer<_InIterator>::__type _Integral; _M_construct_aux(__beg, __end, _Integral()); } // For Input Iterators, used in istreambuf_iterators, etc. template<typename _InIterator> void _M_construct(_InIterator __beg, _InIterator __end, std::input_iterator_tag); // For forward_iterators up to random_access_iterators, used for // string::iterator, _CharT*, etc. template<typename _FwdIterator> void _M_construct(_FwdIterator __beg, _FwdIterator __end, std::forward_iterator_tag); void _M_construct(size_type __req, _CharT __c); allocator_type& _M_get_allocator() { return _M_dataplus; } const allocator_type& _M_get_allocator() const { return _M_dataplus; } private: #ifdef _GLIBCXX_DISAMBIGUATE_REPLACE_INST // The explicit instantiations in misc-inst.cc require this due to // https://gcc.gnu.org/bugzilla/show_bug.cgi?id=64063 template<typename _Tp, bool _Requires = !__are_same<_Tp, _CharT*>::__value && !__are_same<_Tp, const _CharT*>::__value && !__are_same<_Tp, iterator>::__value && !__are_same<_Tp, const_iterator>::__value> struct __enable_if_not_native_iterator { typedef basic_string& __type; }; template<typename _Tp> struct __enable_if_not_native_iterator<_Tp, false> { }; #endif size_type _M_check(size_type __pos, const char* __s) const { if (__pos > this->size()) __throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > " "this->size() (which is %zu)"), __s, __pos, this->size()); return __pos; } void _M_check_length(size_type __n1, size_type __n2, const char* __s) const { if (this->max_size() - (this->size() - __n1) < __n2) __throw_length_error(__N(__s)); } // NB: _M_limit doesn't check for a bad __pos value. size_type _M_limit(size_type __pos, size_type __off) const _GLIBCXX_NOEXCEPT { const bool __testoff = __off < this->size() - __pos; return __testoff ? __off : this->size() - __pos; } // True if _Rep and source do not overlap. bool _M_disjunct(const _CharT* __s) const _GLIBCXX_NOEXCEPT { return (less<const _CharT*>()(__s, _M_data()) || less<const _CharT*>()(_M_data() + this->size(), __s)); } // When __n = 1 way faster than the general multichar // traits_type::copy/move/assign. static void _S_copy(_CharT* __d, const _CharT* __s, size_type __n) { if (__n == 1) traits_type::assign(*__d, *__s); else traits_type::copy(__d, __s, __n); } static void _S_move(_CharT* __d, const _CharT* __s, size_type __n) { if (__n == 1) traits_type::assign(*__d, *__s); else traits_type::move(__d, __s, __n); } static void _S_assign(_CharT* __d, size_type __n, _CharT __c) { if (__n == 1) traits_type::assign(*__d, __c); else traits_type::assign(__d, __n, __c); } // _S_copy_chars is a separate template to permit specialization // to optimize for the common case of pointers as iterators. template<class _Iterator> static void _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2) { for (; __k1 != __k2; ++__k1, (void)++__p) traits_type::assign(*__p, *__k1); // These types are off. } static void _S_copy_chars(_CharT* __p, iterator __k1, iterator __k2) _GLIBCXX_NOEXCEPT { _S_copy_chars(__p, __k1.base(), __k2.base()); } static void _S_copy_chars(_CharT* __p, const_iterator __k1, const_iterator __k2) _GLIBCXX_NOEXCEPT { _S_copy_chars(__p, __k1.base(), __k2.base()); } static void _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2) _GLIBCXX_NOEXCEPT { _S_copy(__p, __k1, __k2 - __k1); } static void _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2) _GLIBCXX_NOEXCEPT { _S_copy(__p, __k1, __k2 - __k1); } static int _S_compare(size_type __n1, size_type __n2) _GLIBCXX_NOEXCEPT { const difference_type __d = difference_type(__n1 - __n2); if (__d > __gnu_cxx::__numeric_traits<int>::__max) return __gnu_cxx::__numeric_traits<int>::__max; else if (__d < __gnu_cxx::__numeric_traits<int>::__min) return __gnu_cxx::__numeric_traits<int>::__min; else return int(__d); } void _M_assign(const basic_string&); void _M_mutate(size_type __pos, size_type __len1, const _CharT* __s, size_type __len2); void _M_erase(size_type __pos, size_type __n); public: // Construct/copy/destroy: // NB: We overload ctors in some cases instead of using default // arguments, per 17.4.4.4 para. 2 item 2. /** * @brief Default constructor creates an empty string. */ basic_string() _GLIBCXX_NOEXCEPT_IF(is_nothrow_default_constructible<_Alloc>::value) : _M_dataplus(_M_local_data()) { _M_set_length(0); } /** * @brief Construct an empty string using allocator @a a. */ explicit basic_string(const _Alloc& __a) _GLIBCXX_NOEXCEPT : _M_dataplus(_M_local_data(), __a) { _M_set_length(0); } /** * @brief Construct string with copy of value of @a __str. * @param __str Source string. */ basic_string(const basic_string& __str) : _M_dataplus(_M_local_data(), _Alloc_traits::_S_select_on_copy(__str._M_get_allocator())) { _M_construct(__str._M_data(), __str._M_data() + __str.length()); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2583. no way to supply an allocator for basic_string(str, pos) /** * @brief Construct string as copy of a substring. * @param __str Source string. * @param __pos Index of first character to copy from. * @param __a Allocator to use. */ basic_string(const basic_string& __str, size_type __pos, const _Alloc& __a = _Alloc()) : _M_dataplus(_M_local_data(), __a) { const _CharT* __start = __str._M_data() + __str._M_check(__pos, "basic_string::basic_string"); _M_construct(__start, __start + __str._M_limit(__pos, npos)); } /** * @brief Construct string as copy of a substring. * @param __str Source string. * @param __pos Index of first character to copy from. * @param __n Number of characters to copy. */ basic_string(const basic_string& __str, size_type __pos, size_type __n) : _M_dataplus(_M_local_data()) { const _CharT* __start = __str._M_data() + __str._M_check(__pos, "basic_string::basic_string"); _M_construct(__start, __start + __str._M_limit(__pos, __n)); } /** * @brief Construct string as copy of a substring. * @param __str Source string. * @param __pos Index of first character to copy from. * @param __n Number of characters to copy. * @param __a Allocator to use. */ basic_string(const basic_string& __str, size_type __pos, size_type __n, const _Alloc& __a) : _M_dataplus(_M_local_data(), __a) { const _CharT* __start = __str._M_data() + __str._M_check(__pos, "string::string"); _M_construct(__start, __start + __str._M_limit(__pos, __n)); } /** * @brief Construct string initialized by a character %array. * @param __s Source character %array. * @param __n Number of characters to copy. * @param __a Allocator to use (default is default allocator). * * NB: @a __s must have at least @a __n characters, '\\0' * has no special meaning. */ basic_string(const _CharT* __s, size_type __n, const _Alloc& __a = _Alloc()) : _M_dataplus(_M_local_data(), __a) { _M_construct(__s, __s + __n); } /** * @brief Construct string as copy of a C string. * @param __s Source C string. * @param __a Allocator to use (default is default allocator). */ #if __cpp_deduction_guides && ! defined _GLIBCXX_DEFINING_STRING_INSTANTIATIONS // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3076. basic_string CTAD ambiguity template<typename = _RequireAllocator<_Alloc>> #endif basic_string(const _CharT* __s, const _Alloc& __a = _Alloc()) : _M_dataplus(_M_local_data(), __a) { _M_construct(__s, __s ? __s + traits_type::length(__s) : __s+npos); } /** * @brief Construct string as multiple characters. * @param __n Number of characters. * @param __c Character to use. * @param __a Allocator to use (default is default allocator). */ #if __cpp_deduction_guides && ! defined _GLIBCXX_DEFINING_STRING_INSTANTIATIONS // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3076. basic_string CTAD ambiguity template<typename = _RequireAllocator<_Alloc>> #endif basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc()) : _M_dataplus(_M_local_data(), __a) { _M_construct(__n, __c); } #if __cplusplus >= 201103L /** * @brief Move construct string. * @param __str Source string. * * The newly-created string contains the exact contents of @a __str. * @a __str is a valid, but unspecified string. **/ basic_string(basic_string&& __str) noexcept : _M_dataplus(_M_local_data(), std::move(__str._M_get_allocator())) { if (__str._M_is_local()) { traits_type::copy(_M_local_buf, __str._M_local_buf, _S_local_capacity + 1); } else { _M_data(__str._M_data()); _M_capacity(__str._M_allocated_capacity); } // Must use _M_length() here not _M_set_length() because // basic_stringbuf relies on writing into unallocated capacity so // we mess up the contents if we put a '\0' in the string. _M_length(__str.length()); __str._M_data(__str._M_local_data()); __str._M_set_length(0); } /** * @brief Construct string from an initializer %list. * @param __l std::initializer_list of characters. * @param __a Allocator to use (default is default allocator). */ basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc()) : _M_dataplus(_M_local_data(), __a) { _M_construct(__l.begin(), __l.end()); } basic_string(const basic_string& __str, const _Alloc& __a) : _M_dataplus(_M_local_data(), __a) { _M_construct(__str.begin(), __str.end()); } basic_string(basic_string&& __str, const _Alloc& __a) noexcept(_Alloc_traits::_S_always_equal()) : _M_dataplus(_M_local_data(), __a) { if (__str._M_is_local()) { traits_type::copy(_M_local_buf, __str._M_local_buf, _S_local_capacity + 1); _M_length(__str.length()); __str._M_set_length(0); } else if (_Alloc_traits::_S_always_equal() || __str.get_allocator() == __a) { _M_data(__str._M_data()); _M_length(__str.length()); _M_capacity(__str._M_allocated_capacity); __str._M_data(__str._M_local_buf); __str._M_set_length(0); } else _M_construct(__str.begin(), __str.end()); } #endif // C++11 /** * @brief Construct string as copy of a range. * @param __beg Start of range. * @param __end End of range. * @param __a Allocator to use (default is default allocator). */ #if __cplusplus >= 201103L template<typename _InputIterator, typename = std::_RequireInputIter<_InputIterator>> #else template<typename _InputIterator> #endif basic_string(_InputIterator __beg, _InputIterator __end, const _Alloc& __a = _Alloc()) : _M_dataplus(_M_local_data(), __a) { _M_construct(__beg, __end); } #if __cplusplus >= 201703L /** * @brief Construct string from a substring of a string_view. * @param __t Source object convertible to string view. * @param __pos The index of the first character to copy from __t. * @param __n The number of characters to copy from __t. * @param __a Allocator to use. */ template<typename _Tp, typename = _If_sv<_Tp, void>> basic_string(const _Tp& __t, size_type __pos, size_type __n, const _Alloc& __a = _Alloc()) : basic_string(_S_to_string_view(__t).substr(__pos, __n), __a) { } /** * @brief Construct string from a string_view. * @param __t Source object convertible to string view. * @param __a Allocator to use (default is default allocator). */ template<typename _Tp, typename = _If_sv<_Tp, void>> explicit basic_string(const _Tp& __t, const _Alloc& __a = _Alloc()) : basic_string(__sv_wrapper(_S_to_string_view(__t)), __a) { } #endif // C++17 /** * @brief Destroy the string instance. */ ~basic_string() { _M_dispose(); } /** * @brief Assign the value of @a str to this string. * @param __str Source string. */ basic_string& operator=(const basic_string& __str) { return this->assign(__str); } /** * @brief Copy contents of @a s into this string. * @param __s Source null-terminated string. */ basic_string& operator=(const _CharT* __s) { return this->assign(__s); } /** * @brief Set value to string of length 1. * @param __c Source character. * * Assigning to a character makes this string length 1 and * (*this)[0] == @a c. */ basic_string& operator=(_CharT __c) { this->assign(1, __c); return *this; } #if __cplusplus >= 201103L /** * @brief Move assign the value of @a str to this string. * @param __str Source string. * * The contents of @a str are moved into this string (without copying). * @a str is a valid, but unspecified string. **/ // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2063. Contradictory requirements for string move assignment basic_string& operator=(basic_string&& __str) noexcept(_Alloc_traits::_S_nothrow_move()) { if (!_M_is_local() && _Alloc_traits::_S_propagate_on_move_assign() && !_Alloc_traits::_S_always_equal() && _M_get_allocator() != __str._M_get_allocator()) { // Destroy existing storage before replacing allocator. _M_destroy(_M_allocated_capacity); _M_data(_M_local_data()); _M_set_length(0); } // Replace allocator if POCMA is true. std::__alloc_on_move(_M_get_allocator(), __str._M_get_allocator()); if (__str._M_is_local()) { // We've always got room for a short string, just copy it. if (__str.size()) this->_S_copy(_M_data(), __str._M_data(), __str.size()); _M_set_length(__str.size()); } else if (_Alloc_traits::_S_propagate_on_move_assign() || _Alloc_traits::_S_always_equal() || _M_get_allocator() == __str._M_get_allocator()) { // Just move the allocated pointer, our allocator can free it. pointer __data = nullptr; size_type __capacity; if (!_M_is_local()) { if (_Alloc_traits::_S_always_equal()) { // __str can reuse our existing storage. __data = _M_data(); __capacity = _M_allocated_capacity; } else // __str can't use it, so free it. _M_destroy(_M_allocated_capacity); } _M_data(__str._M_data()); _M_length(__str.length()); _M_capacity(__str._M_allocated_capacity); if (__data) { __str._M_data(__data); __str._M_capacity(__capacity); } else __str._M_data(__str._M_local_buf); } else // Need to do a deep copy assign(__str); __str.clear(); return *this; } /** * @brief Set value to string constructed from initializer %list. * @param __l std::initializer_list. */ basic_string& operator=(initializer_list<_CharT> __l) { this->assign(__l.begin(), __l.size()); return *this; } #endif // C++11 #if __cplusplus >= 201703L /** * @brief Set value to string constructed from a string_view. * @param __svt An object convertible to string_view. */ template<typename _Tp> _If_sv<_Tp, basic_string&> operator=(const _Tp& __svt) { return this->assign(__svt); } /** * @brief Convert to a string_view. * @return A string_view. */ operator __sv_type() const noexcept { return __sv_type(data(), size()); } #endif // C++17 // Iterators: /** * Returns a read/write iterator that points to the first character in * the %string. */ iterator begin() _GLIBCXX_NOEXCEPT { return iterator(_M_data()); } /** * Returns a read-only (constant) iterator that points to the first * character in the %string. */ const_iterator begin() const _GLIBCXX_NOEXCEPT { return const_iterator(_M_data()); } /** * Returns a read/write iterator that points one past the last * character in the %string. */ iterator end() _GLIBCXX_NOEXCEPT { return iterator(_M_data() + this->size()); } /** * Returns a read-only (constant) iterator that points one past the * last character in the %string. */ const_iterator end() const _GLIBCXX_NOEXCEPT { return const_iterator(_M_data() + this->size()); } /** * Returns a read/write reverse iterator that points to the last * character in the %string. Iteration is done in reverse element * order. */ reverse_iterator rbegin() _GLIBCXX_NOEXCEPT { return reverse_iterator(this->end()); } /** * Returns a read-only (constant) reverse iterator that points * to the last character in the %string. Iteration is done in * reverse element order. */ const_reverse_iterator rbegin() const _GLIBCXX_NOEXCEPT { return const_reverse_iterator(this->end()); } /** * Returns a read/write reverse iterator that points to one before the * first character in the %string. Iteration is done in reverse * element order. */ reverse_iterator rend() _GLIBCXX_NOEXCEPT { return reverse_iterator(this->begin()); } /** * Returns a read-only (constant) reverse iterator that points * to one before the first character in the %string. Iteration * is done in reverse element order. */ const_reverse_iterator rend() const _GLIBCXX_NOEXCEPT { return const_reverse_iterator(this->begin()); } #if __cplusplus >= 201103L /** * Returns a read-only (constant) iterator that points to the first * character in the %string. */ const_iterator cbegin() const noexcept { return const_iterator(this->_M_data()); } /** * Returns a read-only (constant) iterator that points one past the * last character in the %string. */ const_iterator cend() const noexcept { return const_iterator(this->_M_data() + this->size()); } /** * Returns a read-only (constant) reverse iterator that points * to the last character in the %string. Iteration is done in * reverse element order. */ const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(this->end()); } /** * Returns a read-only (constant) reverse iterator that points * to one before the first character in the %string. Iteration * is done in reverse element order. */ const_reverse_iterator crend() const noexcept { return const_reverse_iterator(this->begin()); } #endif public: // Capacity: /// Returns the number of characters in the string, not including any /// null-termination. size_type size() const _GLIBCXX_NOEXCEPT { return _M_string_length; } /// Returns the number of characters in the string, not including any /// null-termination. size_type length() const _GLIBCXX_NOEXCEPT { return _M_string_length; } /// Returns the size() of the largest possible %string. size_type max_size() const _GLIBCXX_NOEXCEPT { return (_Alloc_traits::max_size(_M_get_allocator()) - 1) / 2; } /** * @brief Resizes the %string to the specified number of characters. * @param __n Number of characters the %string should contain. * @param __c Character to fill any new elements. * * This function will %resize the %string to the specified * number of characters. If the number is smaller than the * %string's current size the %string is truncated, otherwise * the %string is extended and new elements are %set to @a __c. */ void resize(size_type __n, _CharT __c); /** * @brief Resizes the %string to the specified number of characters. * @param __n Number of characters the %string should contain. * * This function will resize the %string to the specified length. If * the new size is smaller than the %string's current size the %string * is truncated, otherwise the %string is extended and new characters * are default-constructed. For basic types such as char, this means * setting them to 0. */ void resize(size_type __n) { this->resize(__n, _CharT()); } #if __cplusplus >= 201103L /// A non-binding request to reduce capacity() to size(). void shrink_to_fit() noexcept { #if __cpp_exceptions if (capacity() > size()) { try { reserve(0); } catch(...) { } } #endif } #endif /** * Returns the total number of characters that the %string can hold * before needing to allocate more memory. */ size_type capacity() const _GLIBCXX_NOEXCEPT { return _M_is_local() ? size_type(_S_local_capacity) : _M_allocated_capacity; } /** * @brief Attempt to preallocate enough memory for specified number of * characters. * @param __res_arg Number of characters required. * @throw std::length_error If @a __res_arg exceeds @c max_size(). * * This function attempts to reserve enough memory for the * %string to hold the specified number of characters. If the * number requested is more than max_size(), length_error is * thrown. * * The advantage of this function is that if optimal code is a * necessity and the user can determine the string length that will be * required, the user can reserve the memory in %advance, and thus * prevent a possible reallocation of memory and copying of %string * data. */ void reserve(size_type __res_arg = 0); /** * Erases the string, making it empty. */ void clear() _GLIBCXX_NOEXCEPT { _M_set_length(0); } /** * Returns true if the %string is empty. Equivalent to * <code>*this == ""</code>. */ _GLIBCXX_NODISCARD bool empty() const _GLIBCXX_NOEXCEPT { return this->size() == 0; } // Element access: /** * @brief Subscript access to the data contained in the %string. * @param __pos The index of the character to access. * @return Read-only (constant) reference to the character. * * This operator allows for easy, array-style, data access. * Note that data access with this operator is unchecked and * out_of_range lookups are not defined. (For checked lookups * see at().) */ const_reference operator[] (size_type __pos) const _GLIBCXX_NOEXCEPT { __glibcxx_assert(__pos <= size()); return _M_data()[__pos]; } /** * @brief Subscript access to the data contained in the %string. * @param __pos The index of the character to access. * @return Read/write reference to the character. * * This operator allows for easy, array-style, data access. * Note that data access with this operator is unchecked and * out_of_range lookups are not defined. (For checked lookups * see at().) */ reference operator[](size_type __pos) { // Allow pos == size() both in C++98 mode, as v3 extension, // and in C++11 mode. __glibcxx_assert(__pos <= size()); // In pedantic mode be strict in C++98 mode. _GLIBCXX_DEBUG_PEDASSERT(__cplusplus >= 201103L || __pos < size()); return _M_data()[__pos]; } /** * @brief Provides access to the data contained in the %string. * @param __n The index of the character to access. * @return Read-only (const) reference to the character. * @throw std::out_of_range If @a n is an invalid index. * * This function provides for safer data access. The parameter is * first checked that it is in the range of the string. The function * throws out_of_range if the check fails. */ const_reference at(size_type __n) const { if (__n >= this->size()) __throw_out_of_range_fmt(__N("basic_string::at: __n " "(which is %zu) >= this->size() " "(which is %zu)"), __n, this->size()); return _M_data()[__n]; } /** * @brief Provides access to the data contained in the %string. * @param __n The index of the character to access. * @return Read/write reference to the character. * @throw std::out_of_range If @a n is an invalid index. * * This function provides for safer data access. The parameter is * first checked that it is in the range of the string. The function * throws out_of_range if the check fails. */ reference at(size_type __n) { if (__n >= size()) __throw_out_of_range_fmt(__N("basic_string::at: __n " "(which is %zu) >= this->size() " "(which is %zu)"), __n, this->size()); return _M_data()[__n]; } #if __cplusplus >= 201103L /** * Returns a read/write reference to the data at the first * element of the %string. */ reference front() noexcept { __glibcxx_assert(!empty()); return operator[](0); } /** * Returns a read-only (constant) reference to the data at the first * element of the %string. */ const_reference front() const noexcept { __glibcxx_assert(!empty()); return operator[](0); } /** * Returns a read/write reference to the data at the last * element of the %string. */ reference back() noexcept { __glibcxx_assert(!empty()); return operator[](this->size() - 1); } /** * Returns a read-only (constant) reference to the data at the * last element of the %string. */ const_reference back() const noexcept { __glibcxx_assert(!empty()); return operator[](this->size() - 1); } #endif // Modifiers: /** * @brief Append a string to this string. * @param __str The string to append. * @return Reference to this string. */ basic_string& operator+=(const basic_string& __str) { return this->append(__str); } /** * @brief Append a C string. * @param __s The C string to append. * @return Reference to this string. */ basic_string& operator+=(const _CharT* __s) { return this->append(__s); } /** * @brief Append a character. * @param __c The character to append. * @return Reference to this string. */ basic_string& operator+=(_CharT __c) { this->push_back(__c); return *this; } #if __cplusplus >= 201103L /** * @brief Append an initializer_list of characters. * @param __l The initializer_list of characters to be appended. * @return Reference to this string. */ basic_string& operator+=(initializer_list<_CharT> __l) { return this->append(__l.begin(), __l.size()); } #endif // C++11 #if __cplusplus >= 201703L /** * @brief Append a string_view. * @param __svt An object convertible to string_view to be appended. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> operator+=(const _Tp& __svt) { return this->append(__svt); } #endif // C++17 /** * @brief Append a string to this string. * @param __str The string to append. * @return Reference to this string. */ basic_string& append(const basic_string& __str) { return _M_append(__str._M_data(), __str.size()); } /** * @brief Append a substring. * @param __str The string to append. * @param __pos Index of the first character of str to append. * @param __n The number of characters to append. * @return Reference to this string. * @throw std::out_of_range if @a __pos is not a valid index. * * This function appends @a __n characters from @a __str * starting at @a __pos to this string. If @a __n is is larger * than the number of available characters in @a __str, the * remainder of @a __str is appended. */ basic_string& append(const basic_string& __str, size_type __pos, size_type __n = npos) { return _M_append(__str._M_data() + __str._M_check(__pos, "basic_string::append"), __str._M_limit(__pos, __n)); } /** * @brief Append a C substring. * @param __s The C string to append. * @param __n The number of characters to append. * @return Reference to this string. */ basic_string& append(const _CharT* __s, size_type __n) { __glibcxx_requires_string_len(__s, __n); _M_check_length(size_type(0), __n, "basic_string::append"); return _M_append(__s, __n); } /** * @brief Append a C string. * @param __s The C string to append. * @return Reference to this string. */ basic_string& append(const _CharT* __s) { __glibcxx_requires_string(__s); const size_type __n = traits_type::length(__s); _M_check_length(size_type(0), __n, "basic_string::append"); return _M_append(__s, __n); } /** * @brief Append multiple characters. * @param __n The number of characters to append. * @param __c The character to use. * @return Reference to this string. * * Appends __n copies of __c to this string. */ basic_string& append(size_type __n, _CharT __c) { return _M_replace_aux(this->size(), size_type(0), __n, __c); } #if __cplusplus >= 201103L /** * @brief Append an initializer_list of characters. * @param __l The initializer_list of characters to append. * @return Reference to this string. */ basic_string& append(initializer_list<_CharT> __l) { return this->append(__l.begin(), __l.size()); } #endif // C++11 /** * @brief Append a range of characters. * @param __first Iterator referencing the first character to append. * @param __last Iterator marking the end of the range. * @return Reference to this string. * * Appends characters in the range [__first,__last) to this string. */ #if __cplusplus >= 201103L template<class _InputIterator, typename = std::_RequireInputIter<_InputIterator>> #else template<class _InputIterator> #endif basic_string& append(_InputIterator __first, _InputIterator __last) { return this->replace(end(), end(), __first, __last); } #if __cplusplus >= 201703L /** * @brief Append a string_view. * @param __svt An object convertible to string_view to be appended. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> append(const _Tp& __svt) { __sv_type __sv = __svt; return this->append(__sv.data(), __sv.size()); } /** * @brief Append a range of characters from a string_view. * @param __svt An object convertible to string_view to be appended from. * @param __pos The position in the string_view to append from. * @param __n The number of characters to append from the string_view. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> append(const _Tp& __svt, size_type __pos, size_type __n = npos) { __sv_type __sv = __svt; return _M_append(__sv.data() + std::__sv_check(__sv.size(), __pos, "basic_string::append"), std::__sv_limit(__sv.size(), __pos, __n)); } #endif // C++17 /** * @brief Append a single character. * @param __c Character to append. */ void push_back(_CharT __c) { const size_type __size = this->size(); if (__size + 1 > this->capacity()) this->_M_mutate(__size, size_type(0), 0, size_type(1)); traits_type::assign(this->_M_data()[__size], __c); this->_M_set_length(__size + 1); } /** * @brief Set value to contents of another string. * @param __str Source string to use. * @return Reference to this string. */ basic_string& assign(const basic_string& __str) { #if __cplusplus >= 201103L if (_Alloc_traits::_S_propagate_on_copy_assign()) { if (!_Alloc_traits::_S_always_equal() && !_M_is_local() && _M_get_allocator() != __str._M_get_allocator()) { // Propagating allocator cannot free existing storage so must // deallocate it before replacing current allocator. if (__str.size() <= _S_local_capacity) { _M_destroy(_M_allocated_capacity); _M_data(_M_local_data()); _M_set_length(0); } else { const auto __len = __str.size(); auto __alloc = __str._M_get_allocator(); // If this allocation throws there are no effects: auto __ptr = _Alloc_traits::allocate(__alloc, __len + 1); _M_destroy(_M_allocated_capacity); _M_data(__ptr); _M_capacity(__len); _M_set_length(__len); } } std::__alloc_on_copy(_M_get_allocator(), __str._M_get_allocator()); } #endif this->_M_assign(__str); return *this; } #if __cplusplus >= 201103L /** * @brief Set value to contents of another string. * @param __str Source string to use. * @return Reference to this string. * * This function sets this string to the exact contents of @a __str. * @a __str is a valid, but unspecified string. */ basic_string& assign(basic_string&& __str) noexcept(_Alloc_traits::_S_nothrow_move()) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2063. Contradictory requirements for string move assignment return *this = std::move(__str); } #endif // C++11 /** * @brief Set value to a substring of a string. * @param __str The string to use. * @param __pos Index of the first character of str. * @param __n Number of characters to use. * @return Reference to this string. * @throw std::out_of_range if @a pos is not a valid index. * * This function sets this string to the substring of @a __str * consisting of @a __n characters at @a __pos. If @a __n is * is larger than the number of available characters in @a * __str, the remainder of @a __str is used. */ basic_string& assign(const basic_string& __str, size_type __pos, size_type __n = npos) { return _M_replace(size_type(0), this->size(), __str._M_data() + __str._M_check(__pos, "basic_string::assign"), __str._M_limit(__pos, __n)); } /** * @brief Set value to a C substring. * @param __s The C string to use. * @param __n Number of characters to use. * @return Reference to this string. * * This function sets the value of this string to the first @a __n * characters of @a __s. If @a __n is is larger than the number of * available characters in @a __s, the remainder of @a __s is used. */ basic_string& assign(const _CharT* __s, size_type __n) { __glibcxx_requires_string_len(__s, __n); return _M_replace(size_type(0), this->size(), __s, __n); } /** * @brief Set value to contents of a C string. * @param __s The C string to use. * @return Reference to this string. * * This function sets the value of this string to the value of @a __s. * The data is copied, so there is no dependence on @a __s once the * function returns. */ basic_string& assign(const _CharT* __s) { __glibcxx_requires_string(__s); return _M_replace(size_type(0), this->size(), __s, traits_type::length(__s)); } /** * @brief Set value to multiple characters. * @param __n Length of the resulting string. * @param __c The character to use. * @return Reference to this string. * * This function sets the value of this string to @a __n copies of * character @a __c. */ basic_string& assign(size_type __n, _CharT __c) { return _M_replace_aux(size_type(0), this->size(), __n, __c); } /** * @brief Set value to a range of characters. * @param __first Iterator referencing the first character to append. * @param __last Iterator marking the end of the range. * @return Reference to this string. * * Sets value of string to characters in the range [__first,__last). */ #if __cplusplus >= 201103L template<class _InputIterator, typename = std::_RequireInputIter<_InputIterator>> #else template<class _InputIterator> #endif basic_string& assign(_InputIterator __first, _InputIterator __last) { return this->replace(begin(), end(), __first, __last); } #if __cplusplus >= 201103L /** * @brief Set value to an initializer_list of characters. * @param __l The initializer_list of characters to assign. * @return Reference to this string. */ basic_string& assign(initializer_list<_CharT> __l) { return this->assign(__l.begin(), __l.size()); } #endif // C++11 #if __cplusplus >= 201703L /** * @brief Set value from a string_view. * @param __svt The source object convertible to string_view. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> assign(const _Tp& __svt) { __sv_type __sv = __svt; return this->assign(__sv.data(), __sv.size()); } /** * @brief Set value from a range of characters in a string_view. * @param __svt The source object convertible to string_view. * @param __pos The position in the string_view to assign from. * @param __n The number of characters to assign. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> assign(const _Tp& __svt, size_type __pos, size_type __n = npos) { __sv_type __sv = __svt; return _M_replace(size_type(0), this->size(), __sv.data() + std::__sv_check(__sv.size(), __pos, "basic_string::assign"), std::__sv_limit(__sv.size(), __pos, __n)); } #endif // C++17 #if __cplusplus >= 201103L /** * @brief Insert multiple characters. * @param __p Const_iterator referencing location in string to * insert at. * @param __n Number of characters to insert * @param __c The character to insert. * @return Iterator referencing the first inserted char. * @throw std::length_error If new length exceeds @c max_size(). * * Inserts @a __n copies of character @a __c starting at the * position referenced by iterator @a __p. If adding * characters causes the length to exceed max_size(), * length_error is thrown. The value of the string doesn't * change if an error is thrown. */ iterator insert(const_iterator __p, size_type __n, _CharT __c) { _GLIBCXX_DEBUG_PEDASSERT(__p >= begin() && __p <= end()); const size_type __pos = __p - begin(); this->replace(__p, __p, __n, __c); return iterator(this->_M_data() + __pos); } #else /** * @brief Insert multiple characters. * @param __p Iterator referencing location in string to insert at. * @param __n Number of characters to insert * @param __c The character to insert. * @throw std::length_error If new length exceeds @c max_size(). * * Inserts @a __n copies of character @a __c starting at the * position referenced by iterator @a __p. If adding * characters causes the length to exceed max_size(), * length_error is thrown. The value of the string doesn't * change if an error is thrown. */ void insert(iterator __p, size_type __n, _CharT __c) { this->replace(__p, __p, __n, __c); } #endif #if __cplusplus >= 201103L /** * @brief Insert a range of characters. * @param __p Const_iterator referencing location in string to * insert at. * @param __beg Start of range. * @param __end End of range. * @return Iterator referencing the first inserted char. * @throw std::length_error If new length exceeds @c max_size(). * * Inserts characters in range [beg,end). If adding characters * causes the length to exceed max_size(), length_error is * thrown. The value of the string doesn't change if an error * is thrown. */ template<class _InputIterator, typename = std::_RequireInputIter<_InputIterator>> iterator insert(const_iterator __p, _InputIterator __beg, _InputIterator __end) { _GLIBCXX_DEBUG_PEDASSERT(__p >= begin() && __p <= end()); const size_type __pos = __p - begin(); this->replace(__p, __p, __beg, __end); return iterator(this->_M_data() + __pos); } #else /** * @brief Insert a range of characters. * @param __p Iterator referencing location in string to insert at. * @param __beg Start of range. * @param __end End of range. * @throw std::length_error If new length exceeds @c max_size(). * * Inserts characters in range [__beg,__end). If adding * characters causes the length to exceed max_size(), * length_error is thrown. The value of the string doesn't * change if an error is thrown. */ template<class _InputIterator> void insert(iterator __p, _InputIterator __beg, _InputIterator __end) { this->replace(__p, __p, __beg, __end); } #endif #if __cplusplus >= 201103L /** * @brief Insert an initializer_list of characters. * @param __p Iterator referencing location in string to insert at. * @param __l The initializer_list of characters to insert. * @throw std::length_error If new length exceeds @c max_size(). */ iterator insert(const_iterator __p, initializer_list<_CharT> __l) { return this->insert(__p, __l.begin(), __l.end()); } #ifdef _GLIBCXX_DEFINING_STRING_INSTANTIATIONS // See PR libstdc++/83328 void insert(iterator __p, initializer_list<_CharT> __l) { _GLIBCXX_DEBUG_PEDASSERT(__p >= begin() && __p <= end()); this->insert(__p - begin(), __l.begin(), __l.size()); } #endif #endif // C++11 /** * @brief Insert value of a string. * @param __pos1 Position in string to insert at. * @param __str The string to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Inserts value of @a __str starting at @a __pos1. If adding * characters causes the length to exceed max_size(), * length_error is thrown. The value of the string doesn't * change if an error is thrown. */ basic_string& insert(size_type __pos1, const basic_string& __str) { return this->replace(__pos1, size_type(0), __str._M_data(), __str.size()); } /** * @brief Insert a substring. * @param __pos1 Position in string to insert at. * @param __str The string to insert. * @param __pos2 Start of characters in str to insert. * @param __n Number of characters to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * @throw std::out_of_range If @a pos1 > size() or * @a __pos2 > @a str.size(). * * Starting at @a pos1, insert @a __n character of @a __str * beginning with @a __pos2. If adding characters causes the * length to exceed max_size(), length_error is thrown. If @a * __pos1 is beyond the end of this string or @a __pos2 is * beyond the end of @a __str, out_of_range is thrown. The * value of the string doesn't change if an error is thrown. */ basic_string& insert(size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n = npos) { return this->replace(__pos1, size_type(0), __str._M_data() + __str._M_check(__pos2, "basic_string::insert"), __str._M_limit(__pos2, __n)); } /** * @brief Insert a C substring. * @param __pos Position in string to insert at. * @param __s The C string to insert. * @param __n The number of characters to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * @throw std::out_of_range If @a __pos is beyond the end of this * string. * * Inserts the first @a __n characters of @a __s starting at @a * __pos. If adding characters causes the length to exceed * max_size(), length_error is thrown. If @a __pos is beyond * end(), out_of_range is thrown. The value of the string * doesn't change if an error is thrown. */ basic_string& insert(size_type __pos, const _CharT* __s, size_type __n) { return this->replace(__pos, size_type(0), __s, __n); } /** * @brief Insert a C string. * @param __pos Position in string to insert at. * @param __s The C string to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * @throw std::out_of_range If @a pos is beyond the end of this * string. * * Inserts the first @a n characters of @a __s starting at @a __pos. If * adding characters causes the length to exceed max_size(), * length_error is thrown. If @a __pos is beyond end(), out_of_range is * thrown. The value of the string doesn't change if an error is * thrown. */ basic_string& insert(size_type __pos, const _CharT* __s) { __glibcxx_requires_string(__s); return this->replace(__pos, size_type(0), __s, traits_type::length(__s)); } /** * @brief Insert multiple characters. * @param __pos Index in string to insert at. * @param __n Number of characters to insert * @param __c The character to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * @throw std::out_of_range If @a __pos is beyond the end of this * string. * * Inserts @a __n copies of character @a __c starting at index * @a __pos. If adding characters causes the length to exceed * max_size(), length_error is thrown. If @a __pos > length(), * out_of_range is thrown. The value of the string doesn't * change if an error is thrown. */ basic_string& insert(size_type __pos, size_type __n, _CharT __c) { return _M_replace_aux(_M_check(__pos, "basic_string::insert"), size_type(0), __n, __c); } /** * @brief Insert one character. * @param __p Iterator referencing position in string to insert at. * @param __c The character to insert. * @return Iterator referencing newly inserted char. * @throw std::length_error If new length exceeds @c max_size(). * * Inserts character @a __c at position referenced by @a __p. * If adding character causes the length to exceed max_size(), * length_error is thrown. If @a __p is beyond end of string, * out_of_range is thrown. The value of the string doesn't * change if an error is thrown. */ iterator insert(__const_iterator __p, _CharT __c) { _GLIBCXX_DEBUG_PEDASSERT(__p >= begin() && __p <= end()); const size_type __pos = __p - begin(); _M_replace_aux(__pos, size_type(0), size_type(1), __c); return iterator(_M_data() + __pos); } #if __cplusplus >= 201703L /** * @brief Insert a string_view. * @param __pos Position in string to insert at. * @param __svt The object convertible to string_view to insert. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> insert(size_type __pos, const _Tp& __svt) { __sv_type __sv = __svt; return this->insert(__pos, __sv.data(), __sv.size()); } /** * @brief Insert a string_view. * @param __pos1 Position in string to insert at. * @param __svt The object convertible to string_view to insert from. * @param __pos2 Start of characters in str to insert. * @param __n The number of characters to insert. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> insert(size_type __pos1, const _Tp& __svt, size_type __pos2, size_type __n = npos) { __sv_type __sv = __svt; return this->replace(__pos1, size_type(0), __sv.data() + std::__sv_check(__sv.size(), __pos2, "basic_string::insert"), std::__sv_limit(__sv.size(), __pos2, __n)); } #endif // C++17 /** * @brief Remove characters. * @param __pos Index of first character to remove (default 0). * @param __n Number of characters to remove (default remainder). * @return Reference to this string. * @throw std::out_of_range If @a pos is beyond the end of this * string. * * Removes @a __n characters from this string starting at @a * __pos. The length of the string is reduced by @a __n. If * there are < @a __n characters to remove, the remainder of * the string is truncated. If @a __p is beyond end of string, * out_of_range is thrown. The value of the string doesn't * change if an error is thrown. */ basic_string& erase(size_type __pos = 0, size_type __n = npos) { _M_check(__pos, "basic_string::erase"); if (__n == npos) this->_M_set_length(__pos); else if (__n != 0) this->_M_erase(__pos, _M_limit(__pos, __n)); return *this; } /** * @brief Remove one character. * @param __position Iterator referencing the character to remove. * @return iterator referencing same location after removal. * * Removes the character at @a __position from this string. The value * of the string doesn't change if an error is thrown. */ iterator erase(__const_iterator __position) { _GLIBCXX_DEBUG_PEDASSERT(__position >= begin() && __position < end()); const size_type __pos = __position - begin(); this->_M_erase(__pos, size_type(1)); return iterator(_M_data() + __pos); } /** * @brief Remove a range of characters. * @param __first Iterator referencing the first character to remove. * @param __last Iterator referencing the end of the range. * @return Iterator referencing location of first after removal. * * Removes the characters in the range [first,last) from this string. * The value of the string doesn't change if an error is thrown. */ iterator erase(__const_iterator __first, __const_iterator __last) { _GLIBCXX_DEBUG_PEDASSERT(__first >= begin() && __first <= __last && __last <= end()); const size_type __pos = __first - begin(); if (__last == end()) this->_M_set_length(__pos); else this->_M_erase(__pos, __last - __first); return iterator(this->_M_data() + __pos); } #if __cplusplus >= 201103L /** * @brief Remove the last character. * * The string must be non-empty. */ void pop_back() noexcept { __glibcxx_assert(!empty()); _M_erase(size() - 1, 1); } #endif // C++11 /** * @brief Replace characters with value from another string. * @param __pos Index of first character to replace. * @param __n Number of characters to be replaced. * @param __str String to insert. * @return Reference to this string. * @throw std::out_of_range If @a pos is beyond the end of this * string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__pos,__pos+__n) from * this string. In place, the value of @a __str is inserted. * If @a __pos is beyond end of string, out_of_range is thrown. * If the length of the result exceeds max_size(), length_error * is thrown. The value of the string doesn't change if an * error is thrown. */ basic_string& replace(size_type __pos, size_type __n, const basic_string& __str) { return this->replace(__pos, __n, __str._M_data(), __str.size()); } /** * @brief Replace characters with value from another string. * @param __pos1 Index of first character to replace. * @param __n1 Number of characters to be replaced. * @param __str String to insert. * @param __pos2 Index of first character of str to use. * @param __n2 Number of characters from str to use. * @return Reference to this string. * @throw std::out_of_range If @a __pos1 > size() or @a __pos2 > * __str.size(). * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__pos1,__pos1 + n) from this * string. In place, the value of @a __str is inserted. If @a __pos is * beyond end of string, out_of_range is thrown. If the length of the * result exceeds max_size(), length_error is thrown. The value of the * string doesn't change if an error is thrown. */ basic_string& replace(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2 = npos) { return this->replace(__pos1, __n1, __str._M_data() + __str._M_check(__pos2, "basic_string::replace"), __str._M_limit(__pos2, __n2)); } /** * @brief Replace characters with value of a C substring. * @param __pos Index of first character to replace. * @param __n1 Number of characters to be replaced. * @param __s C string to insert. * @param __n2 Number of characters from @a s to use. * @return Reference to this string. * @throw std::out_of_range If @a pos1 > size(). * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__pos,__pos + __n1) * from this string. In place, the first @a __n2 characters of * @a __s are inserted, or all of @a __s if @a __n2 is too large. If * @a __pos is beyond end of string, out_of_range is thrown. If * the length of result exceeds max_size(), length_error is * thrown. The value of the string doesn't change if an error * is thrown. */ basic_string& replace(size_type __pos, size_type __n1, const _CharT* __s, size_type __n2) { __glibcxx_requires_string_len(__s, __n2); return _M_replace(_M_check(__pos, "basic_string::replace"), _M_limit(__pos, __n1), __s, __n2); } /** * @brief Replace characters with value of a C string. * @param __pos Index of first character to replace. * @param __n1 Number of characters to be replaced. * @param __s C string to insert. * @return Reference to this string. * @throw std::out_of_range If @a pos > size(). * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__pos,__pos + __n1) * from this string. In place, the characters of @a __s are * inserted. If @a __pos is beyond end of string, out_of_range * is thrown. If the length of result exceeds max_size(), * length_error is thrown. The value of the string doesn't * change if an error is thrown. */ basic_string& replace(size_type __pos, size_type __n1, const _CharT* __s) { __glibcxx_requires_string(__s); return this->replace(__pos, __n1, __s, traits_type::length(__s)); } /** * @brief Replace characters with multiple characters. * @param __pos Index of first character to replace. * @param __n1 Number of characters to be replaced. * @param __n2 Number of characters to insert. * @param __c Character to insert. * @return Reference to this string. * @throw std::out_of_range If @a __pos > size(). * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [pos,pos + n1) from this * string. In place, @a __n2 copies of @a __c are inserted. * If @a __pos is beyond end of string, out_of_range is thrown. * If the length of result exceeds max_size(), length_error is * thrown. The value of the string doesn't change if an error * is thrown. */ basic_string& replace(size_type __pos, size_type __n1, size_type __n2, _CharT __c) { return _M_replace_aux(_M_check(__pos, "basic_string::replace"), _M_limit(__pos, __n1), __n2, __c); } /** * @brief Replace range of characters with string. * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __str String value to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * the value of @a __str is inserted. If the length of result * exceeds max_size(), length_error is thrown. The value of * the string doesn't change if an error is thrown. */ basic_string& replace(__const_iterator __i1, __const_iterator __i2, const basic_string& __str) { return this->replace(__i1, __i2, __str._M_data(), __str.size()); } /** * @brief Replace range of characters with C substring. * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __s C string value to insert. * @param __n Number of characters from s to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * the first @a __n characters of @a __s are inserted. If the * length of result exceeds max_size(), length_error is thrown. * The value of the string doesn't change if an error is * thrown. */ basic_string& replace(__const_iterator __i1, __const_iterator __i2, const _CharT* __s, size_type __n) { _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2 && __i2 <= end()); return this->replace(__i1 - begin(), __i2 - __i1, __s, __n); } /** * @brief Replace range of characters with C string. * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __s C string value to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * the characters of @a __s are inserted. If the length of * result exceeds max_size(), length_error is thrown. The * value of the string doesn't change if an error is thrown. */ basic_string& replace(__const_iterator __i1, __const_iterator __i2, const _CharT* __s) { __glibcxx_requires_string(__s); return this->replace(__i1, __i2, __s, traits_type::length(__s)); } /** * @brief Replace range of characters with multiple characters * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __n Number of characters to insert. * @param __c Character to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * @a __n copies of @a __c are inserted. If the length of * result exceeds max_size(), length_error is thrown. The * value of the string doesn't change if an error is thrown. */ basic_string& replace(__const_iterator __i1, __const_iterator __i2, size_type __n, _CharT __c) { _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2 && __i2 <= end()); return _M_replace_aux(__i1 - begin(), __i2 - __i1, __n, __c); } /** * @brief Replace range of characters with range. * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __k1 Iterator referencing start of range to insert. * @param __k2 Iterator referencing end of range to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * characters in the range [__k1,__k2) are inserted. If the * length of result exceeds max_size(), length_error is thrown. * The value of the string doesn't change if an error is * thrown. */ #if __cplusplus >= 201103L template<class _InputIterator, typename = std::_RequireInputIter<_InputIterator>> basic_string& replace(const_iterator __i1, const_iterator __i2, _InputIterator __k1, _InputIterator __k2) { _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2 && __i2 <= end()); __glibcxx_requires_valid_range(__k1, __k2); return this->_M_replace_dispatch(__i1, __i2, __k1, __k2, std::__false_type()); } #else template<class _InputIterator> #ifdef _GLIBCXX_DISAMBIGUATE_REPLACE_INST typename __enable_if_not_native_iterator<_InputIterator>::__type #else basic_string& #endif replace(iterator __i1, iterator __i2, _InputIterator __k1, _InputIterator __k2) { _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2 && __i2 <= end()); __glibcxx_requires_valid_range(__k1, __k2); typedef typename std::__is_integer<_InputIterator>::__type _Integral; return _M_replace_dispatch(__i1, __i2, __k1, __k2, _Integral()); } #endif // Specializations for the common case of pointer and iterator: // useful to avoid the overhead of temporary buffering in _M_replace. basic_string& replace(__const_iterator __i1, __const_iterator __i2, _CharT* __k1, _CharT* __k2) { _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2 && __i2 <= end()); __glibcxx_requires_valid_range(__k1, __k2); return this->replace(__i1 - begin(), __i2 - __i1, __k1, __k2 - __k1); } basic_string& replace(__const_iterator __i1, __const_iterator __i2, const _CharT* __k1, const _CharT* __k2) { _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2 && __i2 <= end()); __glibcxx_requires_valid_range(__k1, __k2); return this->replace(__i1 - begin(), __i2 - __i1, __k1, __k2 - __k1); } basic_string& replace(__const_iterator __i1, __const_iterator __i2, iterator __k1, iterator __k2) { _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2 && __i2 <= end()); __glibcxx_requires_valid_range(__k1, __k2); return this->replace(__i1 - begin(), __i2 - __i1, __k1.base(), __k2 - __k1); } basic_string& replace(__const_iterator __i1, __const_iterator __i2, const_iterator __k1, const_iterator __k2) { _GLIBCXX_DEBUG_PEDASSERT(begin() <= __i1 && __i1 <= __i2 && __i2 <= end()); __glibcxx_requires_valid_range(__k1, __k2); return this->replace(__i1 - begin(), __i2 - __i1, __k1.base(), __k2 - __k1); } #if __cplusplus >= 201103L /** * @brief Replace range of characters with initializer_list. * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __l The initializer_list of characters to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * characters in the range [__k1,__k2) are inserted. If the * length of result exceeds max_size(), length_error is thrown. * The value of the string doesn't change if an error is * thrown. */ basic_string& replace(const_iterator __i1, const_iterator __i2, initializer_list<_CharT> __l) { return this->replace(__i1, __i2, __l.begin(), __l.size()); } #endif // C++11 #if __cplusplus >= 201703L /** * @brief Replace range of characters with string_view. * @param __pos The position to replace at. * @param __n The number of characters to replace. * @param __svt The object convertible to string_view to insert. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> replace(size_type __pos, size_type __n, const _Tp& __svt) { __sv_type __sv = __svt; return this->replace(__pos, __n, __sv.data(), __sv.size()); } /** * @brief Replace range of characters with string_view. * @param __pos1 The position to replace at. * @param __n1 The number of characters to replace. * @param __svt The object convertible to string_view to insert from. * @param __pos2 The position in the string_view to insert from. * @param __n2 The number of characters to insert. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> replace(size_type __pos1, size_type __n1, const _Tp& __svt, size_type __pos2, size_type __n2 = npos) { __sv_type __sv = __svt; return this->replace(__pos1, __n1, __sv.data() + std::__sv_check(__sv.size(), __pos2, "basic_string::replace"), std::__sv_limit(__sv.size(), __pos2, __n2)); } /** * @brief Replace range of characters with string_view. * @param __i1 An iterator referencing the start position to replace at. * @param __i2 An iterator referencing the end position for the replace. * @param __svt The object convertible to string_view to insert from. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> replace(const_iterator __i1, const_iterator __i2, const _Tp& __svt) { __sv_type __sv = __svt; return this->replace(__i1 - begin(), __i2 - __i1, __sv); } #endif // C++17 private: template<class _Integer> basic_string& _M_replace_dispatch(const_iterator __i1, const_iterator __i2, _Integer __n, _Integer __val, __true_type) { return _M_replace_aux(__i1 - begin(), __i2 - __i1, __n, __val); } template<class _InputIterator> basic_string& _M_replace_dispatch(const_iterator __i1, const_iterator __i2, _InputIterator __k1, _InputIterator __k2, __false_type); basic_string& _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2, _CharT __c); basic_string& _M_replace(size_type __pos, size_type __len1, const _CharT* __s, const size_type __len2); basic_string& _M_append(const _CharT* __s, size_type __n); public: /** * @brief Copy substring into C string. * @param __s C string to copy value into. * @param __n Number of characters to copy. * @param __pos Index of first character to copy. * @return Number of characters actually copied * @throw std::out_of_range If __pos > size(). * * Copies up to @a __n characters starting at @a __pos into the * C string @a __s. If @a __pos is %greater than size(), * out_of_range is thrown. */ size_type copy(_CharT* __s, size_type __n, size_type __pos = 0) const; /** * @brief Swap contents with another string. * @param __s String to swap with. * * Exchanges the contents of this string with that of @a __s in constant * time. */ void swap(basic_string& __s) _GLIBCXX_NOEXCEPT; // String operations: /** * @brief Return const pointer to null-terminated contents. * * This is a handle to internal data. Do not modify or dire things may * happen. */ const _CharT* c_str() const _GLIBCXX_NOEXCEPT { return _M_data(); } /** * @brief Return const pointer to contents. * * This is a pointer to internal data. It is undefined to modify * the contents through the returned pointer. To get a pointer that * allows modifying the contents use @c &str[0] instead, * (or in C++17 the non-const @c str.data() overload). */ const _CharT* data() const _GLIBCXX_NOEXCEPT { return _M_data(); } #if __cplusplus >= 201703L /** * @brief Return non-const pointer to contents. * * This is a pointer to the character sequence held by the string. * Modifying the characters in the sequence is allowed. */ _CharT* data() noexcept { return _M_data(); } #endif /** * @brief Return copy of allocator used to construct this string. */ allocator_type get_allocator() const _GLIBCXX_NOEXCEPT { return _M_get_allocator(); } /** * @brief Find position of a C substring. * @param __s C string to locate. * @param __pos Index of character to search from. * @param __n Number of characters from @a s to search for. * @return Index of start of first occurrence. * * Starting from @a __pos, searches forward for the first @a * __n characters in @a __s within this string. If found, * returns the index where it begins. If not found, returns * npos. */ size_type find(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find position of a string. * @param __str String to locate. * @param __pos Index of character to search from (default 0). * @return Index of start of first occurrence. * * Starting from @a __pos, searches forward for value of @a __str within * this string. If found, returns the index where it begins. If not * found, returns npos. */ size_type find(const basic_string& __str, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { return this->find(__str.data(), __pos, __str.size()); } #if __cplusplus >= 201703L /** * @brief Find position of a string_view. * @param __svt The object convertible to string_view to locate. * @param __pos Index of character to search from (default 0). * @return Index of start of first occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> find(const _Tp& __svt, size_type __pos = 0) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->find(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find position of a C string. * @param __s C string to locate. * @param __pos Index of character to search from (default 0). * @return Index of start of first occurrence. * * Starting from @a __pos, searches forward for the value of @a * __s within this string. If found, returns the index where * it begins. If not found, returns npos. */ size_type find(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->find(__s, __pos, traits_type::length(__s)); } /** * @brief Find position of a character. * @param __c Character to locate. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for @a __c within * this string. If found, returns the index where it was * found. If not found, returns npos. */ size_type find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT; /** * @brief Find last position of a string. * @param __str String to locate. * @param __pos Index of character to search back from (default end). * @return Index of start of last occurrence. * * Starting from @a __pos, searches backward for value of @a * __str within this string. If found, returns the index where * it begins. If not found, returns npos. */ size_type rfind(const basic_string& __str, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { return this->rfind(__str.data(), __pos, __str.size()); } #if __cplusplus >= 201703L /** * @brief Find last position of a string_view. * @param __svt The object convertible to string_view to locate. * @param __pos Index of character to search back from (default end). * @return Index of start of last occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> rfind(const _Tp& __svt, size_type __pos = npos) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->rfind(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find last position of a C substring. * @param __s C string to locate. * @param __pos Index of character to search back from. * @param __n Number of characters from s to search for. * @return Index of start of last occurrence. * * Starting from @a __pos, searches backward for the first @a * __n characters in @a __s within this string. If found, * returns the index where it begins. If not found, returns * npos. */ size_type rfind(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find last position of a C string. * @param __s C string to locate. * @param __pos Index of character to start search at (default end). * @return Index of start of last occurrence. * * Starting from @a __pos, searches backward for the value of * @a __s within this string. If found, returns the index * where it begins. If not found, returns npos. */ size_type rfind(const _CharT* __s, size_type __pos = npos) const { __glibcxx_requires_string(__s); return this->rfind(__s, __pos, traits_type::length(__s)); } /** * @brief Find last position of a character. * @param __c Character to locate. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for @a __c within * this string. If found, returns the index where it was * found. If not found, returns npos. */ size_type rfind(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT; /** * @brief Find position of a character of string. * @param __str String containing characters to locate. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for one of the * characters of @a __str within this string. If found, * returns the index where it was found. If not found, returns * npos. */ size_type find_first_of(const basic_string& __str, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { return this->find_first_of(__str.data(), __pos, __str.size()); } #if __cplusplus >= 201703L /** * @brief Find position of a character of a string_view. * @param __svt An object convertible to string_view containing * characters to locate. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> find_first_of(const _Tp& __svt, size_type __pos = 0) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->find_first_of(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find position of a character of C substring. * @param __s String containing characters to locate. * @param __pos Index of character to search from. * @param __n Number of characters from s to search for. * @return Index of first occurrence. * * Starting from @a __pos, searches forward for one of the * first @a __n characters of @a __s within this string. If * found, returns the index where it was found. If not found, * returns npos. */ size_type find_first_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find position of a character of C string. * @param __s String containing characters to locate. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for one of the * characters of @a __s within this string. If found, returns * the index where it was found. If not found, returns npos. */ size_type find_first_of(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->find_first_of(__s, __pos, traits_type::length(__s)); } /** * @brief Find position of a character. * @param __c Character to locate. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for the character * @a __c within this string. If found, returns the index * where it was found. If not found, returns npos. * * Note: equivalent to find(__c, __pos). */ size_type find_first_of(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { return this->find(__c, __pos); } /** * @brief Find last position of a character of string. * @param __str String containing characters to locate. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for one of the * characters of @a __str within this string. If found, * returns the index where it was found. If not found, returns * npos. */ size_type find_last_of(const basic_string& __str, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { return this->find_last_of(__str.data(), __pos, __str.size()); } #if __cplusplus >= 201703L /** * @brief Find last position of a character of string. * @param __svt An object convertible to string_view containing * characters to locate. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> find_last_of(const _Tp& __svt, size_type __pos = npos) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->find_last_of(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find last position of a character of C substring. * @param __s C string containing characters to locate. * @param __pos Index of character to search back from. * @param __n Number of characters from s to search for. * @return Index of last occurrence. * * Starting from @a __pos, searches backward for one of the * first @a __n characters of @a __s within this string. If * found, returns the index where it was found. If not found, * returns npos. */ size_type find_last_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find last position of a character of C string. * @param __s C string containing characters to locate. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for one of the * characters of @a __s within this string. If found, returns * the index where it was found. If not found, returns npos. */ size_type find_last_of(const _CharT* __s, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->find_last_of(__s, __pos, traits_type::length(__s)); } /** * @brief Find last position of a character. * @param __c Character to locate. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for @a __c within * this string. If found, returns the index where it was * found. If not found, returns npos. * * Note: equivalent to rfind(__c, __pos). */ size_type find_last_of(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { return this->rfind(__c, __pos); } /** * @brief Find position of a character not in string. * @param __str String containing characters to avoid. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for a character not contained * in @a __str within this string. If found, returns the index where it * was found. If not found, returns npos. */ size_type find_first_not_of(const basic_string& __str, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { return this->find_first_not_of(__str.data(), __pos, __str.size()); } #if __cplusplus >= 201703L /** * @brief Find position of a character not in a string_view. * @param __svt A object convertible to string_view containing * characters to avoid. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> find_first_not_of(const _Tp& __svt, size_type __pos = 0) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->find_first_not_of(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find position of a character not in C substring. * @param __s C string containing characters to avoid. * @param __pos Index of character to search from. * @param __n Number of characters from __s to consider. * @return Index of first occurrence. * * Starting from @a __pos, searches forward for a character not * contained in the first @a __n characters of @a __s within * this string. If found, returns the index where it was * found. If not found, returns npos. */ size_type find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find position of a character not in C string. * @param __s C string containing characters to avoid. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for a character not * contained in @a __s within this string. If found, returns * the index where it was found. If not found, returns npos. */ size_type find_first_not_of(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->find_first_not_of(__s, __pos, traits_type::length(__s)); } /** * @brief Find position of a different character. * @param __c Character to avoid. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for a character * other than @a __c within this string. If found, returns the * index where it was found. If not found, returns npos. */ size_type find_first_not_of(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT; /** * @brief Find last position of a character not in string. * @param __str String containing characters to avoid. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for a character * not contained in @a __str within this string. If found, * returns the index where it was found. If not found, returns * npos. */ size_type find_last_not_of(const basic_string& __str, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { return this->find_last_not_of(__str.data(), __pos, __str.size()); } #if __cplusplus >= 201703L /** * @brief Find last position of a character not in a string_view. * @param __svt An object convertible to string_view containing * characters to avoid. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> find_last_not_of(const _Tp& __svt, size_type __pos = npos) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->find_last_not_of(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find last position of a character not in C substring. * @param __s C string containing characters to avoid. * @param __pos Index of character to search back from. * @param __n Number of characters from s to consider. * @return Index of last occurrence. * * Starting from @a __pos, searches backward for a character not * contained in the first @a __n characters of @a __s within this string. * If found, returns the index where it was found. If not found, * returns npos. */ size_type find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find last position of a character not in C string. * @param __s C string containing characters to avoid. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for a character * not contained in @a __s within this string. If found, * returns the index where it was found. If not found, returns * npos. */ size_type find_last_not_of(const _CharT* __s, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->find_last_not_of(__s, __pos, traits_type::length(__s)); } /** * @brief Find last position of a different character. * @param __c Character to avoid. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for a character other than * @a __c within this string. If found, returns the index where it was * found. If not found, returns npos. */ size_type find_last_not_of(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT; /** * @brief Get a substring. * @param __pos Index of first character (default 0). * @param __n Number of characters in substring (default remainder). * @return The new string. * @throw std::out_of_range If __pos > size(). * * Construct and return a new string using the @a __n * characters starting at @a __pos. If the string is too * short, use the remainder of the characters. If @a __pos is * beyond the end of the string, out_of_range is thrown. */ basic_string substr(size_type __pos = 0, size_type __n = npos) const { return basic_string(*this, _M_check(__pos, "basic_string::substr"), __n); } /** * @brief Compare to a string. * @param __str String to compare against. * @return Integer < 0, 0, or > 0. * * Returns an integer < 0 if this string is ordered before @a * __str, 0 if their values are equivalent, or > 0 if this * string is ordered after @a __str. Determines the effective * length rlen of the strings to compare as the smallest of * size() and str.size(). The function then compares the two * strings by calling traits::compare(data(), str.data(),rlen). * If the result of the comparison is nonzero returns it, * otherwise the shorter one is ordered first. */ int compare(const basic_string& __str) const { const size_type __size = this->size(); const size_type __osize = __str.size(); const size_type __len = std::min(__size, __osize); int __r = traits_type::compare(_M_data(), __str.data(), __len); if (!__r) __r = _S_compare(__size, __osize); return __r; } #if __cplusplus >= 201703L /** * @brief Compare to a string_view. * @param __svt An object convertible to string_view to compare against. * @return Integer < 0, 0, or > 0. */ template<typename _Tp> _If_sv<_Tp, int> compare(const _Tp& __svt) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; const size_type __size = this->size(); const size_type __osize = __sv.size(); const size_type __len = std::min(__size, __osize); int __r = traits_type::compare(_M_data(), __sv.data(), __len); if (!__r) __r = _S_compare(__size, __osize); return __r; } /** * @brief Compare to a string_view. * @param __pos A position in the string to start comparing from. * @param __n The number of characters to compare. * @param __svt An object convertible to string_view to compare * against. * @return Integer < 0, 0, or > 0. */ template<typename _Tp> _If_sv<_Tp, int> compare(size_type __pos, size_type __n, const _Tp& __svt) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return __sv_type(*this).substr(__pos, __n).compare(__sv); } /** * @brief Compare to a string_view. * @param __pos1 A position in the string to start comparing from. * @param __n1 The number of characters to compare. * @param __svt An object convertible to string_view to compare * against. * @param __pos2 A position in the string_view to start comparing from. * @param __n2 The number of characters to compare. * @return Integer < 0, 0, or > 0. */ template<typename _Tp> _If_sv<_Tp, int> compare(size_type __pos1, size_type __n1, const _Tp& __svt, size_type __pos2, size_type __n2 = npos) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return __sv_type(*this) .substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2)); } #endif // C++17 /** * @brief Compare substring to a string. * @param __pos Index of first character of substring. * @param __n Number of characters in substring. * @param __str String to compare against. * @return Integer < 0, 0, or > 0. * * Form the substring of this string from the @a __n characters * starting at @a __pos. Returns an integer < 0 if the * substring is ordered before @a __str, 0 if their values are * equivalent, or > 0 if the substring is ordered after @a * __str. Determines the effective length rlen of the strings * to compare as the smallest of the length of the substring * and @a __str.size(). The function then compares the two * strings by calling * traits::compare(substring.data(),str.data(),rlen). If the * result of the comparison is nonzero returns it, otherwise * the shorter one is ordered first. */ int compare(size_type __pos, size_type __n, const basic_string& __str) const; /** * @brief Compare substring to a substring. * @param __pos1 Index of first character of substring. * @param __n1 Number of characters in substring. * @param __str String to compare against. * @param __pos2 Index of first character of substring of str. * @param __n2 Number of characters in substring of str. * @return Integer < 0, 0, or > 0. * * Form the substring of this string from the @a __n1 * characters starting at @a __pos1. Form the substring of @a * __str from the @a __n2 characters starting at @a __pos2. * Returns an integer < 0 if this substring is ordered before * the substring of @a __str, 0 if their values are equivalent, * or > 0 if this substring is ordered after the substring of * @a __str. Determines the effective length rlen of the * strings to compare as the smallest of the lengths of the * substrings. The function then compares the two strings by * calling * traits::compare(substring.data(),str.substr(pos2,n2).data(),rlen). * If the result of the comparison is nonzero returns it, * otherwise the shorter one is ordered first. */ int compare(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2 = npos) const; /** * @brief Compare to a C string. * @param __s C string to compare against. * @return Integer < 0, 0, or > 0. * * Returns an integer < 0 if this string is ordered before @a __s, 0 if * their values are equivalent, or > 0 if this string is ordered after * @a __s. Determines the effective length rlen of the strings to * compare as the smallest of size() and the length of a string * constructed from @a __s. The function then compares the two strings * by calling traits::compare(data(),s,rlen). If the result of the * comparison is nonzero returns it, otherwise the shorter one is * ordered first. */ int compare(const _CharT* __s) const _GLIBCXX_NOEXCEPT; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 5 String::compare specification questionable /** * @brief Compare substring to a C string. * @param __pos Index of first character of substring. * @param __n1 Number of characters in substring. * @param __s C string to compare against. * @return Integer < 0, 0, or > 0. * * Form the substring of this string from the @a __n1 * characters starting at @a pos. Returns an integer < 0 if * the substring is ordered before @a __s, 0 if their values * are equivalent, or > 0 if the substring is ordered after @a * __s. Determines the effective length rlen of the strings to * compare as the smallest of the length of the substring and * the length of a string constructed from @a __s. The * function then compares the two string by calling * traits::compare(substring.data(),__s,rlen). If the result of * the comparison is nonzero returns it, otherwise the shorter * one is ordered first. */ int compare(size_type __pos, size_type __n1, const _CharT* __s) const; /** * @brief Compare substring against a character %array. * @param __pos Index of first character of substring. * @param __n1 Number of characters in substring. * @param __s character %array to compare against. * @param __n2 Number of characters of s. * @return Integer < 0, 0, or > 0. * * Form the substring of this string from the @a __n1 * characters starting at @a __pos. Form a string from the * first @a __n2 characters of @a __s. Returns an integer < 0 * if this substring is ordered before the string from @a __s, * 0 if their values are equivalent, or > 0 if this substring * is ordered after the string from @a __s. Determines the * effective length rlen of the strings to compare as the * smallest of the length of the substring and @a __n2. The * function then compares the two strings by calling * traits::compare(substring.data(),s,rlen). If the result of * the comparison is nonzero returns it, otherwise the shorter * one is ordered first. * * NB: s must have at least n2 characters, '\\0' has * no special meaning. */ int compare(size_type __pos, size_type __n1, const _CharT* __s, size_type __n2) const; #if __cplusplus > 201703L bool starts_with(basic_string_view<_CharT, _Traits> __x) const noexcept { return __sv_type(this->data(), this->size()).starts_with(__x); } bool starts_with(_CharT __x) const noexcept { return __sv_type(this->data(), this->size()).starts_with(__x); } bool starts_with(const _CharT* __x) const noexcept { return __sv_type(this->data(), this->size()).starts_with(__x); } bool ends_with(basic_string_view<_CharT, _Traits> __x) const noexcept { return __sv_type(this->data(), this->size()).ends_with(__x); } bool ends_with(_CharT __x) const noexcept { return __sv_type(this->data(), this->size()).ends_with(__x); } bool ends_with(const _CharT* __x) const noexcept { return __sv_type(this->data(), this->size()).ends_with(__x); } #endif // C++20 // Allow basic_stringbuf::__xfer_bufptrs to call _M_length: template<typename, typename, typename> friend class basic_stringbuf; }; _GLIBCXX_END_NAMESPACE_CXX11 #else // !_GLIBCXX_USE_CXX11_ABI // Reference-counted COW string implentation /** * @class basic_string basic_string.h <string> * @brief Managing sequences of characters and character-like objects. * * @ingroup strings * @ingroup sequences * * @tparam _CharT Type of character * @tparam _Traits Traits for character type, defaults to * char_traits<_CharT>. * @tparam _Alloc Allocator type, defaults to allocator<_CharT>. * * Meets the requirements of a <a href="tables.html#65">container</a>, a * <a href="tables.html#66">reversible container</a>, and a * <a href="tables.html#67">sequence</a>. Of the * <a href="tables.html#68">optional sequence requirements</a>, only * @c push_back, @c at, and @c %array access are supported. * * @doctodo * * * Documentation? What's that? * Nathan Myers <ncm@cantrip.org>. * * A string looks like this: * * @code * [_Rep] * _M_length * [basic_string<char_type>] _M_capacity * _M_dataplus _M_refcount * _M_p ----------------> unnamed array of char_type * @endcode * * Where the _M_p points to the first character in the string, and * you cast it to a pointer-to-_Rep and subtract 1 to get a * pointer to the header. * * This approach has the enormous advantage that a string object * requires only one allocation. All the ugliness is confined * within a single %pair of inline functions, which each compile to * a single @a add instruction: _Rep::_M_data(), and * string::_M_rep(); and the allocation function which gets a * block of raw bytes and with room enough and constructs a _Rep * object at the front. * * The reason you want _M_data pointing to the character %array and * not the _Rep is so that the debugger can see the string * contents. (Probably we should add a non-inline member to get * the _Rep for the debugger to use, so users can check the actual * string length.) * * Note that the _Rep object is a POD so that you can have a * static <em>empty string</em> _Rep object already @a constructed before * static constructors have run. The reference-count encoding is * chosen so that a 0 indicates one reference, so you never try to * destroy the empty-string _Rep object. * * All but the last paragraph is considered pretty conventional * for a C++ string implementation. */ // 21.3 Template class basic_string template<typename _CharT, typename _Traits, typename _Alloc> class basic_string { typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template rebind<_CharT>::other _CharT_alloc_type; typedef __gnu_cxx::__alloc_traits<_CharT_alloc_type> _CharT_alloc_traits; // Types: public: typedef _Traits traits_type; typedef typename _Traits::char_type value_type; typedef _Alloc allocator_type; typedef typename _CharT_alloc_type::size_type size_type; typedef typename _CharT_alloc_type::difference_type difference_type; #if __cplusplus < 201103L typedef typename _CharT_alloc_type::reference reference; typedef typename _CharT_alloc_type::const_reference const_reference; #else typedef value_type& reference; typedef const value_type& const_reference; #endif typedef typename _CharT_alloc_traits::pointer pointer; typedef typename _CharT_alloc_traits::const_pointer const_pointer; typedef __gnu_cxx::__normal_iterator<pointer, basic_string> iterator; typedef __gnu_cxx::__normal_iterator<const_pointer, basic_string> const_iterator; typedef std::reverse_iterator<const_iterator> const_reverse_iterator; typedef std::reverse_iterator<iterator> reverse_iterator; protected: // type used for positions in insert, erase etc. typedef iterator __const_iterator; private: // _Rep: string representation // Invariants: // 1. String really contains _M_length + 1 characters: due to 21.3.4 // must be kept null-terminated. // 2. _M_capacity >= _M_length // Allocated memory is always (_M_capacity + 1) * sizeof(_CharT). // 3. _M_refcount has three states: // -1: leaked, one reference, no ref-copies allowed, non-const. // 0: one reference, non-const. // n>0: n + 1 references, operations require a lock, const. // 4. All fields==0 is an empty string, given the extra storage // beyond-the-end for a null terminator; thus, the shared // empty string representation needs no constructor. struct _Rep_base { size_type _M_length; size_type _M_capacity; _Atomic_word _M_refcount; }; struct _Rep : _Rep_base { // Types: typedef typename __gnu_cxx::__alloc_traits<_Alloc>::template rebind<char>::other _Raw_bytes_alloc; // (Public) Data members: // The maximum number of individual char_type elements of an // individual string is determined by _S_max_size. This is the // value that will be returned by max_size(). (Whereas npos // is the maximum number of bytes the allocator can allocate.) // If one was to divvy up the theoretical largest size string, // with a terminating character and m _CharT elements, it'd // look like this: // npos = sizeof(_Rep) + (m * sizeof(_CharT)) + sizeof(_CharT) // Solving for m: // m = ((npos - sizeof(_Rep))/sizeof(CharT)) - 1 // In addition, this implementation quarters this amount. static const size_type _S_max_size; static const _CharT _S_terminal; // The following storage is init'd to 0 by the linker, resulting // (carefully) in an empty string with one reference. static size_type _S_empty_rep_storage[]; static _Rep& _S_empty_rep() _GLIBCXX_NOEXCEPT { // NB: Mild hack to avoid strict-aliasing warnings. Note that // _S_empty_rep_storage is never modified and the punning should // be reasonably safe in this case. void* __p = reinterpret_cast<void*>(&_S_empty_rep_storage); return *reinterpret_cast<_Rep*>(__p); } bool _M_is_leaked() const _GLIBCXX_NOEXCEPT { #if defined(__GTHREADS) // _M_refcount is mutated concurrently by _M_refcopy/_M_dispose, // so we need to use an atomic load. However, _M_is_leaked // predicate does not change concurrently (i.e. the string is either // leaked or not), so a relaxed load is enough. return __atomic_load_n(&this->_M_refcount, __ATOMIC_RELAXED) < 0; #else return this->_M_refcount < 0; #endif } bool _M_is_shared() const _GLIBCXX_NOEXCEPT { #if defined(__GTHREADS) // _M_refcount is mutated concurrently by _M_refcopy/_M_dispose, // so we need to use an atomic load. Another thread can drop last // but one reference concurrently with this check, so we need this // load to be acquire to synchronize with release fetch_and_add in // _M_dispose. return __atomic_load_n(&this->_M_refcount, __ATOMIC_ACQUIRE) > 0; #else return this->_M_refcount > 0; #endif } void _M_set_leaked() _GLIBCXX_NOEXCEPT { this->_M_refcount = -1; } void _M_set_sharable() _GLIBCXX_NOEXCEPT { this->_M_refcount = 0; } void _M_set_length_and_sharable(size_type __n) _GLIBCXX_NOEXCEPT { #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0 if (__builtin_expect(this != &_S_empty_rep(), false)) #endif { this->_M_set_sharable(); // One reference. this->_M_length = __n; traits_type::assign(this->_M_refdata()[__n], _S_terminal); // grrr. (per 21.3.4) // You cannot leave those LWG people alone for a second. } } _CharT* _M_refdata() throw() { return reinterpret_cast<_CharT*>(this + 1); } _CharT* _M_grab(const _Alloc& __alloc1, const _Alloc& __alloc2) { return (!_M_is_leaked() && __alloc1 == __alloc2) ? _M_refcopy() : _M_clone(__alloc1); } // Create & Destroy static _Rep* _S_create(size_type, size_type, const _Alloc&); void _M_dispose(const _Alloc& __a) _GLIBCXX_NOEXCEPT { #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0 if (__builtin_expect(this != &_S_empty_rep(), false)) #endif { // Be race-detector-friendly. For more info see bits/c++config. _GLIBCXX_SYNCHRONIZATION_HAPPENS_BEFORE(&this->_M_refcount); // Decrement of _M_refcount is acq_rel, because: // - all but last decrements need to release to synchronize with // the last decrement that will delete the object. // - the last decrement needs to acquire to synchronize with // all the previous decrements. // - last but one decrement needs to release to synchronize with // the acquire load in _M_is_shared that will conclude that // the object is not shared anymore. if (__gnu_cxx::__exchange_and_add_dispatch(&this->_M_refcount, -1) <= 0) { _GLIBCXX_SYNCHRONIZATION_HAPPENS_AFTER(&this->_M_refcount); _M_destroy(__a); } } } // XXX MT void _M_destroy(const _Alloc&) throw(); _CharT* _M_refcopy() throw() { #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0 if (__builtin_expect(this != &_S_empty_rep(), false)) #endif __gnu_cxx::__atomic_add_dispatch(&this->_M_refcount, 1); return _M_refdata(); } // XXX MT _CharT* _M_clone(const _Alloc&, size_type __res = 0); }; // Use empty-base optimization: http://www.cantrip.org/emptyopt.html struct _Alloc_hider : _Alloc { _Alloc_hider(_CharT* __dat, const _Alloc& __a) _GLIBCXX_NOEXCEPT : _Alloc(__a), _M_p(__dat) { } _CharT* _M_p; // The actual data. }; public: // Data Members (public): // NB: This is an unsigned type, and thus represents the maximum // size that the allocator can hold. /// Value returned by various member functions when they fail. static const size_type npos = static_cast<size_type>(-1); private: // Data Members (private): mutable _Alloc_hider _M_dataplus; _CharT* _M_data() const _GLIBCXX_NOEXCEPT { return _M_dataplus._M_p; } _CharT* _M_data(_CharT* __p) _GLIBCXX_NOEXCEPT { return (_M_dataplus._M_p = __p); } _Rep* _M_rep() const _GLIBCXX_NOEXCEPT { return &((reinterpret_cast<_Rep*> (_M_data()))[-1]); } // For the internal use we have functions similar to `begin'/`end' // but they do not call _M_leak. iterator _M_ibegin() const _GLIBCXX_NOEXCEPT { return iterator(_M_data()); } iterator _M_iend() const _GLIBCXX_NOEXCEPT { return iterator(_M_data() + this->size()); } void _M_leak() // for use in begin() & non-const op[] { if (!_M_rep()->_M_is_leaked()) _M_leak_hard(); } size_type _M_check(size_type __pos, const char* __s) const { if (__pos > this->size()) __throw_out_of_range_fmt(__N("%s: __pos (which is %zu) > " "this->size() (which is %zu)"), __s, __pos, this->size()); return __pos; } void _M_check_length(size_type __n1, size_type __n2, const char* __s) const { if (this->max_size() - (this->size() - __n1) < __n2) __throw_length_error(__N(__s)); } // NB: _M_limit doesn't check for a bad __pos value. size_type _M_limit(size_type __pos, size_type __off) const _GLIBCXX_NOEXCEPT { const bool __testoff = __off < this->size() - __pos; return __testoff ? __off : this->size() - __pos; } // True if _Rep and source do not overlap. bool _M_disjunct(const _CharT* __s) const _GLIBCXX_NOEXCEPT { return (less<const _CharT*>()(__s, _M_data()) || less<const _CharT*>()(_M_data() + this->size(), __s)); } // When __n = 1 way faster than the general multichar // traits_type::copy/move/assign. static void _M_copy(_CharT* __d, const _CharT* __s, size_type __n) _GLIBCXX_NOEXCEPT { if (__n == 1) traits_type::assign(*__d, *__s); else traits_type::copy(__d, __s, __n); } static void _M_move(_CharT* __d, const _CharT* __s, size_type __n) _GLIBCXX_NOEXCEPT { if (__n == 1) traits_type::assign(*__d, *__s); else traits_type::move(__d, __s, __n); } static void _M_assign(_CharT* __d, size_type __n, _CharT __c) _GLIBCXX_NOEXCEPT { if (__n == 1) traits_type::assign(*__d, __c); else traits_type::assign(__d, __n, __c); } // _S_copy_chars is a separate template to permit specialization // to optimize for the common case of pointers as iterators. template<class _Iterator> static void _S_copy_chars(_CharT* __p, _Iterator __k1, _Iterator __k2) { for (; __k1 != __k2; ++__k1, (void)++__p) traits_type::assign(*__p, *__k1); // These types are off. } static void _S_copy_chars(_CharT* __p, iterator __k1, iterator __k2) _GLIBCXX_NOEXCEPT { _S_copy_chars(__p, __k1.base(), __k2.base()); } static void _S_copy_chars(_CharT* __p, const_iterator __k1, const_iterator __k2) _GLIBCXX_NOEXCEPT { _S_copy_chars(__p, __k1.base(), __k2.base()); } static void _S_copy_chars(_CharT* __p, _CharT* __k1, _CharT* __k2) _GLIBCXX_NOEXCEPT { _M_copy(__p, __k1, __k2 - __k1); } static void _S_copy_chars(_CharT* __p, const _CharT* __k1, const _CharT* __k2) _GLIBCXX_NOEXCEPT { _M_copy(__p, __k1, __k2 - __k1); } static int _S_compare(size_type __n1, size_type __n2) _GLIBCXX_NOEXCEPT { const difference_type __d = difference_type(__n1 - __n2); if (__d > __gnu_cxx::__numeric_traits<int>::__max) return __gnu_cxx::__numeric_traits<int>::__max; else if (__d < __gnu_cxx::__numeric_traits<int>::__min) return __gnu_cxx::__numeric_traits<int>::__min; else return int(__d); } void _M_mutate(size_type __pos, size_type __len1, size_type __len2); void _M_leak_hard(); static _Rep& _S_empty_rep() _GLIBCXX_NOEXCEPT { return _Rep::_S_empty_rep(); } #if __cplusplus >= 201703L // A helper type for avoiding boiler-plate. typedef basic_string_view<_CharT, _Traits> __sv_type; template<typename _Tp, typename _Res> using _If_sv = enable_if_t< __and_<is_convertible<const _Tp&, __sv_type>, __not_<is_convertible<const _Tp*, const basic_string*>>, __not_<is_convertible<const _Tp&, const _CharT*>>>::value, _Res>; // Allows an implicit conversion to __sv_type. static __sv_type _S_to_string_view(__sv_type __svt) noexcept { return __svt; } // Wraps a string_view by explicit conversion and thus // allows to add an internal constructor that does not // participate in overload resolution when a string_view // is provided. struct __sv_wrapper { explicit __sv_wrapper(__sv_type __sv) noexcept : _M_sv(__sv) { } __sv_type _M_sv; }; /** * @brief Only internally used: Construct string from a string view * wrapper. * @param __svw string view wrapper. * @param __a Allocator to use. */ explicit basic_string(__sv_wrapper __svw, const _Alloc& __a) : basic_string(__svw._M_sv.data(), __svw._M_sv.size(), __a) { } #endif public: // Construct/copy/destroy: // NB: We overload ctors in some cases instead of using default // arguments, per 17.4.4.4 para. 2 item 2. /** * @brief Default constructor creates an empty string. */ basic_string() #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0 _GLIBCXX_NOEXCEPT : _M_dataplus(_S_empty_rep()._M_refdata(), _Alloc()) #else : _M_dataplus(_S_construct(size_type(), _CharT(), _Alloc()), _Alloc()) #endif { } /** * @brief Construct an empty string using allocator @a a. */ explicit basic_string(const _Alloc& __a); // NB: per LWG issue 42, semantics different from IS: /** * @brief Construct string with copy of value of @a str. * @param __str Source string. */ basic_string(const basic_string& __str); // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2583. no way to supply an allocator for basic_string(str, pos) /** * @brief Construct string as copy of a substring. * @param __str Source string. * @param __pos Index of first character to copy from. * @param __a Allocator to use. */ basic_string(const basic_string& __str, size_type __pos, const _Alloc& __a = _Alloc()); /** * @brief Construct string as copy of a substring. * @param __str Source string. * @param __pos Index of first character to copy from. * @param __n Number of characters to copy. */ basic_string(const basic_string& __str, size_type __pos, size_type __n); /** * @brief Construct string as copy of a substring. * @param __str Source string. * @param __pos Index of first character to copy from. * @param __n Number of characters to copy. * @param __a Allocator to use. */ basic_string(const basic_string& __str, size_type __pos, size_type __n, const _Alloc& __a); /** * @brief Construct string initialized by a character %array. * @param __s Source character %array. * @param __n Number of characters to copy. * @param __a Allocator to use (default is default allocator). * * NB: @a __s must have at least @a __n characters, '\\0' * has no special meaning. */ basic_string(const _CharT* __s, size_type __n, const _Alloc& __a = _Alloc()); /** * @brief Construct string as copy of a C string. * @param __s Source C string. * @param __a Allocator to use (default is default allocator). */ #if __cpp_deduction_guides && ! defined _GLIBCXX_DEFINING_STRING_INSTANTIATIONS // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3076. basic_string CTAD ambiguity template<typename = _RequireAllocator<_Alloc>> #endif basic_string(const _CharT* __s, const _Alloc& __a = _Alloc()) : _M_dataplus(_S_construct(__s, __s ? __s + traits_type::length(__s) : __s + npos, __a), __a) { } /** * @brief Construct string as multiple characters. * @param __n Number of characters. * @param __c Character to use. * @param __a Allocator to use (default is default allocator). */ basic_string(size_type __n, _CharT __c, const _Alloc& __a = _Alloc()); #if __cplusplus >= 201103L /** * @brief Move construct string. * @param __str Source string. * * The newly-created string contains the exact contents of @a __str. * @a __str is a valid, but unspecified string. **/ basic_string(basic_string&& __str) #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0 noexcept // FIXME C++11: should always be noexcept. #endif : _M_dataplus(std::move(__str._M_dataplus)) { #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0 __str._M_data(_S_empty_rep()._M_refdata()); #else __str._M_data(_S_construct(size_type(), _CharT(), get_allocator())); #endif } /** * @brief Construct string from an initializer %list. * @param __l std::initializer_list of characters. * @param __a Allocator to use (default is default allocator). */ basic_string(initializer_list<_CharT> __l, const _Alloc& __a = _Alloc()); basic_string(const basic_string& __str, const _Alloc& __a) : _M_dataplus(__str._M_rep()->_M_grab(__a, __str.get_allocator()), __a) { } basic_string(basic_string&& __str, const _Alloc& __a) : _M_dataplus(__str._M_data(), __a) { if (__a == __str.get_allocator()) { #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0 __str._M_data(_S_empty_rep()._M_refdata()); #else __str._M_data(_S_construct(size_type(), _CharT(), __a)); #endif } else _M_dataplus._M_p = _S_construct(__str.begin(), __str.end(), __a); } #endif // C++11 /** * @brief Construct string as copy of a range. * @param __beg Start of range. * @param __end End of range. * @param __a Allocator to use (default is default allocator). */ template<class _InputIterator> basic_string(_InputIterator __beg, _InputIterator __end, const _Alloc& __a = _Alloc()); #if __cplusplus >= 201703L /** * @brief Construct string from a substring of a string_view. * @param __t Source object convertible to string view. * @param __pos The index of the first character to copy from __t. * @param __n The number of characters to copy from __t. * @param __a Allocator to use. */ template<typename _Tp, typename = _If_sv<_Tp, void>> basic_string(const _Tp& __t, size_type __pos, size_type __n, const _Alloc& __a = _Alloc()) : basic_string(_S_to_string_view(__t).substr(__pos, __n), __a) { } /** * @brief Construct string from a string_view. * @param __t Source object convertible to string view. * @param __a Allocator to use (default is default allocator). */ template<typename _Tp, typename = _If_sv<_Tp, void>> explicit basic_string(const _Tp& __t, const _Alloc& __a = _Alloc()) : basic_string(__sv_wrapper(_S_to_string_view(__t)), __a) { } #endif // C++17 /** * @brief Destroy the string instance. */ ~basic_string() _GLIBCXX_NOEXCEPT { _M_rep()->_M_dispose(this->get_allocator()); } /** * @brief Assign the value of @a str to this string. * @param __str Source string. */ basic_string& operator=(const basic_string& __str) { return this->assign(__str); } /** * @brief Copy contents of @a s into this string. * @param __s Source null-terminated string. */ basic_string& operator=(const _CharT* __s) { return this->assign(__s); } /** * @brief Set value to string of length 1. * @param __c Source character. * * Assigning to a character makes this string length 1 and * (*this)[0] == @a c. */ basic_string& operator=(_CharT __c) { this->assign(1, __c); return *this; } #if __cplusplus >= 201103L /** * @brief Move assign the value of @a str to this string. * @param __str Source string. * * The contents of @a str are moved into this string (without copying). * @a str is a valid, but unspecified string. **/ basic_string& operator=(basic_string&& __str) _GLIBCXX_NOEXCEPT_IF(allocator_traits<_Alloc>::is_always_equal::value) { // NB: DR 1204. this->swap(__str); return *this; } /** * @brief Set value to string constructed from initializer %list. * @param __l std::initializer_list. */ basic_string& operator=(initializer_list<_CharT> __l) { this->assign(__l.begin(), __l.size()); return *this; } #endif // C++11 #if __cplusplus >= 201703L /** * @brief Set value to string constructed from a string_view. * @param __svt An object convertible to string_view. */ template<typename _Tp> _If_sv<_Tp, basic_string&> operator=(const _Tp& __svt) { return this->assign(__svt); } /** * @brief Convert to a string_view. * @return A string_view. */ operator __sv_type() const noexcept { return __sv_type(data(), size()); } #endif // C++17 // Iterators: /** * Returns a read/write iterator that points to the first character in * the %string. Unshares the string. */ iterator begin() // FIXME C++11: should be noexcept. { _M_leak(); return iterator(_M_data()); } /** * Returns a read-only (constant) iterator that points to the first * character in the %string. */ const_iterator begin() const _GLIBCXX_NOEXCEPT { return const_iterator(_M_data()); } /** * Returns a read/write iterator that points one past the last * character in the %string. Unshares the string. */ iterator end() // FIXME C++11: should be noexcept. { _M_leak(); return iterator(_M_data() + this->size()); } /** * Returns a read-only (constant) iterator that points one past the * last character in the %string. */ const_iterator end() const _GLIBCXX_NOEXCEPT { return const_iterator(_M_data() + this->size()); } /** * Returns a read/write reverse iterator that points to the last * character in the %string. Iteration is done in reverse element * order. Unshares the string. */ reverse_iterator rbegin() // FIXME C++11: should be noexcept. { return reverse_iterator(this->end()); } /** * Returns a read-only (constant) reverse iterator that points * to the last character in the %string. Iteration is done in * reverse element order. */ const_reverse_iterator rbegin() const _GLIBCXX_NOEXCEPT { return const_reverse_iterator(this->end()); } /** * Returns a read/write reverse iterator that points to one before the * first character in the %string. Iteration is done in reverse * element order. Unshares the string. */ reverse_iterator rend() // FIXME C++11: should be noexcept. { return reverse_iterator(this->begin()); } /** * Returns a read-only (constant) reverse iterator that points * to one before the first character in the %string. Iteration * is done in reverse element order. */ const_reverse_iterator rend() const _GLIBCXX_NOEXCEPT { return const_reverse_iterator(this->begin()); } #if __cplusplus >= 201103L /** * Returns a read-only (constant) iterator that points to the first * character in the %string. */ const_iterator cbegin() const noexcept { return const_iterator(this->_M_data()); } /** * Returns a read-only (constant) iterator that points one past the * last character in the %string. */ const_iterator cend() const noexcept { return const_iterator(this->_M_data() + this->size()); } /** * Returns a read-only (constant) reverse iterator that points * to the last character in the %string. Iteration is done in * reverse element order. */ const_reverse_iterator crbegin() const noexcept { return const_reverse_iterator(this->end()); } /** * Returns a read-only (constant) reverse iterator that points * to one before the first character in the %string. Iteration * is done in reverse element order. */ const_reverse_iterator crend() const noexcept { return const_reverse_iterator(this->begin()); } #endif public: // Capacity: /// Returns the number of characters in the string, not including any /// null-termination. size_type size() const _GLIBCXX_NOEXCEPT { return _M_rep()->_M_length; } /// Returns the number of characters in the string, not including any /// null-termination. size_type length() const _GLIBCXX_NOEXCEPT { return _M_rep()->_M_length; } /// Returns the size() of the largest possible %string. size_type max_size() const _GLIBCXX_NOEXCEPT { return _Rep::_S_max_size; } /** * @brief Resizes the %string to the specified number of characters. * @param __n Number of characters the %string should contain. * @param __c Character to fill any new elements. * * This function will %resize the %string to the specified * number of characters. If the number is smaller than the * %string's current size the %string is truncated, otherwise * the %string is extended and new elements are %set to @a __c. */ void resize(size_type __n, _CharT __c); /** * @brief Resizes the %string to the specified number of characters. * @param __n Number of characters the %string should contain. * * This function will resize the %string to the specified length. If * the new size is smaller than the %string's current size the %string * is truncated, otherwise the %string is extended and new characters * are default-constructed. For basic types such as char, this means * setting them to 0. */ void resize(size_type __n) { this->resize(__n, _CharT()); } #if __cplusplus >= 201103L /// A non-binding request to reduce capacity() to size(). void shrink_to_fit() _GLIBCXX_NOEXCEPT { #if __cpp_exceptions if (capacity() > size()) { try { reserve(0); } catch(...) { } } #endif } #endif /** * Returns the total number of characters that the %string can hold * before needing to allocate more memory. */ size_type capacity() const _GLIBCXX_NOEXCEPT { return _M_rep()->_M_capacity; } /** * @brief Attempt to preallocate enough memory for specified number of * characters. * @param __res_arg Number of characters required. * @throw std::length_error If @a __res_arg exceeds @c max_size(). * * This function attempts to reserve enough memory for the * %string to hold the specified number of characters. If the * number requested is more than max_size(), length_error is * thrown. * * The advantage of this function is that if optimal code is a * necessity and the user can determine the string length that will be * required, the user can reserve the memory in %advance, and thus * prevent a possible reallocation of memory and copying of %string * data. */ void reserve(size_type __res_arg = 0); /** * Erases the string, making it empty. */ #if _GLIBCXX_FULLY_DYNAMIC_STRING == 0 void clear() _GLIBCXX_NOEXCEPT { if (_M_rep()->_M_is_shared()) { _M_rep()->_M_dispose(this->get_allocator()); _M_data(_S_empty_rep()._M_refdata()); } else _M_rep()->_M_set_length_and_sharable(0); } #else // PR 56166: this should not throw. void clear() { _M_mutate(0, this->size(), 0); } #endif /** * Returns true if the %string is empty. Equivalent to * <code>*this == ""</code>. */ _GLIBCXX_NODISCARD bool empty() const _GLIBCXX_NOEXCEPT { return this->size() == 0; } // Element access: /** * @brief Subscript access to the data contained in the %string. * @param __pos The index of the character to access. * @return Read-only (constant) reference to the character. * * This operator allows for easy, array-style, data access. * Note that data access with this operator is unchecked and * out_of_range lookups are not defined. (For checked lookups * see at().) */ const_reference operator[] (size_type __pos) const _GLIBCXX_NOEXCEPT { __glibcxx_assert(__pos <= size()); return _M_data()[__pos]; } /** * @brief Subscript access to the data contained in the %string. * @param __pos The index of the character to access. * @return Read/write reference to the character. * * This operator allows for easy, array-style, data access. * Note that data access with this operator is unchecked and * out_of_range lookups are not defined. (For checked lookups * see at().) Unshares the string. */ reference operator[](size_type __pos) { // Allow pos == size() both in C++98 mode, as v3 extension, // and in C++11 mode. __glibcxx_assert(__pos <= size()); // In pedantic mode be strict in C++98 mode. _GLIBCXX_DEBUG_PEDASSERT(__cplusplus >= 201103L || __pos < size()); _M_leak(); return _M_data()[__pos]; } /** * @brief Provides access to the data contained in the %string. * @param __n The index of the character to access. * @return Read-only (const) reference to the character. * @throw std::out_of_range If @a n is an invalid index. * * This function provides for safer data access. The parameter is * first checked that it is in the range of the string. The function * throws out_of_range if the check fails. */ const_reference at(size_type __n) const { if (__n >= this->size()) __throw_out_of_range_fmt(__N("basic_string::at: __n " "(which is %zu) >= this->size() " "(which is %zu)"), __n, this->size()); return _M_data()[__n]; } /** * @brief Provides access to the data contained in the %string. * @param __n The index of the character to access. * @return Read/write reference to the character. * @throw std::out_of_range If @a n is an invalid index. * * This function provides for safer data access. The parameter is * first checked that it is in the range of the string. The function * throws out_of_range if the check fails. Success results in * unsharing the string. */ reference at(size_type __n) { if (__n >= size()) __throw_out_of_range_fmt(__N("basic_string::at: __n " "(which is %zu) >= this->size() " "(which is %zu)"), __n, this->size()); _M_leak(); return _M_data()[__n]; } #if __cplusplus >= 201103L /** * Returns a read/write reference to the data at the first * element of the %string. */ reference front() { __glibcxx_assert(!empty()); return operator[](0); } /** * Returns a read-only (constant) reference to the data at the first * element of the %string. */ const_reference front() const noexcept { __glibcxx_assert(!empty()); return operator[](0); } /** * Returns a read/write reference to the data at the last * element of the %string. */ reference back() { __glibcxx_assert(!empty()); return operator[](this->size() - 1); } /** * Returns a read-only (constant) reference to the data at the * last element of the %string. */ const_reference back() const noexcept { __glibcxx_assert(!empty()); return operator[](this->size() - 1); } #endif // Modifiers: /** * @brief Append a string to this string. * @param __str The string to append. * @return Reference to this string. */ basic_string& operator+=(const basic_string& __str) { return this->append(__str); } /** * @brief Append a C string. * @param __s The C string to append. * @return Reference to this string. */ basic_string& operator+=(const _CharT* __s) { return this->append(__s); } /** * @brief Append a character. * @param __c The character to append. * @return Reference to this string. */ basic_string& operator+=(_CharT __c) { this->push_back(__c); return *this; } #if __cplusplus >= 201103L /** * @brief Append an initializer_list of characters. * @param __l The initializer_list of characters to be appended. * @return Reference to this string. */ basic_string& operator+=(initializer_list<_CharT> __l) { return this->append(__l.begin(), __l.size()); } #endif // C++11 #if __cplusplus >= 201703L /** * @brief Append a string_view. * @param __svt The object convertible to string_view to be appended. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> operator+=(const _Tp& __svt) { return this->append(__svt); } #endif // C++17 /** * @brief Append a string to this string. * @param __str The string to append. * @return Reference to this string. */ basic_string& append(const basic_string& __str); /** * @brief Append a substring. * @param __str The string to append. * @param __pos Index of the first character of str to append. * @param __n The number of characters to append. * @return Reference to this string. * @throw std::out_of_range if @a __pos is not a valid index. * * This function appends @a __n characters from @a __str * starting at @a __pos to this string. If @a __n is is larger * than the number of available characters in @a __str, the * remainder of @a __str is appended. */ basic_string& append(const basic_string& __str, size_type __pos, size_type __n = npos); /** * @brief Append a C substring. * @param __s The C string to append. * @param __n The number of characters to append. * @return Reference to this string. */ basic_string& append(const _CharT* __s, size_type __n); /** * @brief Append a C string. * @param __s The C string to append. * @return Reference to this string. */ basic_string& append(const _CharT* __s) { __glibcxx_requires_string(__s); return this->append(__s, traits_type::length(__s)); } /** * @brief Append multiple characters. * @param __n The number of characters to append. * @param __c The character to use. * @return Reference to this string. * * Appends __n copies of __c to this string. */ basic_string& append(size_type __n, _CharT __c); #if __cplusplus >= 201103L /** * @brief Append an initializer_list of characters. * @param __l The initializer_list of characters to append. * @return Reference to this string. */ basic_string& append(initializer_list<_CharT> __l) { return this->append(__l.begin(), __l.size()); } #endif // C++11 /** * @brief Append a range of characters. * @param __first Iterator referencing the first character to append. * @param __last Iterator marking the end of the range. * @return Reference to this string. * * Appends characters in the range [__first,__last) to this string. */ template<class _InputIterator> basic_string& append(_InputIterator __first, _InputIterator __last) { return this->replace(_M_iend(), _M_iend(), __first, __last); } #if __cplusplus >= 201703L /** * @brief Append a string_view. * @param __svt The object convertible to string_view to be appended. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> append(const _Tp& __svt) { __sv_type __sv = __svt; return this->append(__sv.data(), __sv.size()); } /** * @brief Append a range of characters from a string_view. * @param __svt The object convertible to string_view to be appended * from. * @param __pos The position in the string_view to append from. * @param __n The number of characters to append from the string_view. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> append(const _Tp& __svt, size_type __pos, size_type __n = npos) { __sv_type __sv = __svt; return append(__sv.data() + std::__sv_check(__sv.size(), __pos, "basic_string::append"), std::__sv_limit(__sv.size(), __pos, __n)); } #endif // C++17 /** * @brief Append a single character. * @param __c Character to append. */ void push_back(_CharT __c) { const size_type __len = 1 + this->size(); if (__len > this->capacity() || _M_rep()->_M_is_shared()) this->reserve(__len); traits_type::assign(_M_data()[this->size()], __c); _M_rep()->_M_set_length_and_sharable(__len); } /** * @brief Set value to contents of another string. * @param __str Source string to use. * @return Reference to this string. */ basic_string& assign(const basic_string& __str); #if __cplusplus >= 201103L /** * @brief Set value to contents of another string. * @param __str Source string to use. * @return Reference to this string. * * This function sets this string to the exact contents of @a __str. * @a __str is a valid, but unspecified string. */ basic_string& assign(basic_string&& __str) noexcept(allocator_traits<_Alloc>::is_always_equal::value) { this->swap(__str); return *this; } #endif // C++11 /** * @brief Set value to a substring of a string. * @param __str The string to use. * @param __pos Index of the first character of str. * @param __n Number of characters to use. * @return Reference to this string. * @throw std::out_of_range if @a pos is not a valid index. * * This function sets this string to the substring of @a __str * consisting of @a __n characters at @a __pos. If @a __n is * is larger than the number of available characters in @a * __str, the remainder of @a __str is used. */ basic_string& assign(const basic_string& __str, size_type __pos, size_type __n = npos) { return this->assign(__str._M_data() + __str._M_check(__pos, "basic_string::assign"), __str._M_limit(__pos, __n)); } /** * @brief Set value to a C substring. * @param __s The C string to use. * @param __n Number of characters to use. * @return Reference to this string. * * This function sets the value of this string to the first @a __n * characters of @a __s. If @a __n is is larger than the number of * available characters in @a __s, the remainder of @a __s is used. */ basic_string& assign(const _CharT* __s, size_type __n); /** * @brief Set value to contents of a C string. * @param __s The C string to use. * @return Reference to this string. * * This function sets the value of this string to the value of @a __s. * The data is copied, so there is no dependence on @a __s once the * function returns. */ basic_string& assign(const _CharT* __s) { __glibcxx_requires_string(__s); return this->assign(__s, traits_type::length(__s)); } /** * @brief Set value to multiple characters. * @param __n Length of the resulting string. * @param __c The character to use. * @return Reference to this string. * * This function sets the value of this string to @a __n copies of * character @a __c. */ basic_string& assign(size_type __n, _CharT __c) { return _M_replace_aux(size_type(0), this->size(), __n, __c); } /** * @brief Set value to a range of characters. * @param __first Iterator referencing the first character to append. * @param __last Iterator marking the end of the range. * @return Reference to this string. * * Sets value of string to characters in the range [__first,__last). */ template<class _InputIterator> basic_string& assign(_InputIterator __first, _InputIterator __last) { return this->replace(_M_ibegin(), _M_iend(), __first, __last); } #if __cplusplus >= 201103L /** * @brief Set value to an initializer_list of characters. * @param __l The initializer_list of characters to assign. * @return Reference to this string. */ basic_string& assign(initializer_list<_CharT> __l) { return this->assign(__l.begin(), __l.size()); } #endif // C++11 #if __cplusplus >= 201703L /** * @brief Set value from a string_view. * @param __svt The source object convertible to string_view. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> assign(const _Tp& __svt) { __sv_type __sv = __svt; return this->assign(__sv.data(), __sv.size()); } /** * @brief Set value from a range of characters in a string_view. * @param __svt The source object convertible to string_view. * @param __pos The position in the string_view to assign from. * @param __n The number of characters to assign. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> assign(const _Tp& __svt, size_type __pos, size_type __n = npos) { __sv_type __sv = __svt; return assign(__sv.data() + std::__sv_check(__sv.size(), __pos, "basic_string::assign"), std::__sv_limit(__sv.size(), __pos, __n)); } #endif // C++17 /** * @brief Insert multiple characters. * @param __p Iterator referencing location in string to insert at. * @param __n Number of characters to insert * @param __c The character to insert. * @throw std::length_error If new length exceeds @c max_size(). * * Inserts @a __n copies of character @a __c starting at the * position referenced by iterator @a __p. If adding * characters causes the length to exceed max_size(), * length_error is thrown. The value of the string doesn't * change if an error is thrown. */ void insert(iterator __p, size_type __n, _CharT __c) { this->replace(__p, __p, __n, __c); } /** * @brief Insert a range of characters. * @param __p Iterator referencing location in string to insert at. * @param __beg Start of range. * @param __end End of range. * @throw std::length_error If new length exceeds @c max_size(). * * Inserts characters in range [__beg,__end). If adding * characters causes the length to exceed max_size(), * length_error is thrown. The value of the string doesn't * change if an error is thrown. */ template<class _InputIterator> void insert(iterator __p, _InputIterator __beg, _InputIterator __end) { this->replace(__p, __p, __beg, __end); } #if __cplusplus >= 201103L /** * @brief Insert an initializer_list of characters. * @param __p Iterator referencing location in string to insert at. * @param __l The initializer_list of characters to insert. * @throw std::length_error If new length exceeds @c max_size(). */ void insert(iterator __p, initializer_list<_CharT> __l) { _GLIBCXX_DEBUG_PEDASSERT(__p >= _M_ibegin() && __p <= _M_iend()); this->insert(__p - _M_ibegin(), __l.begin(), __l.size()); } #endif // C++11 /** * @brief Insert value of a string. * @param __pos1 Position in string to insert at. * @param __str The string to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Inserts value of @a __str starting at @a __pos1. If adding * characters causes the length to exceed max_size(), * length_error is thrown. The value of the string doesn't * change if an error is thrown. */ basic_string& insert(size_type __pos1, const basic_string& __str) { return this->insert(__pos1, __str, size_type(0), __str.size()); } /** * @brief Insert a substring. * @param __pos1 Position in string to insert at. * @param __str The string to insert. * @param __pos2 Start of characters in str to insert. * @param __n Number of characters to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * @throw std::out_of_range If @a pos1 > size() or * @a __pos2 > @a str.size(). * * Starting at @a pos1, insert @a __n character of @a __str * beginning with @a __pos2. If adding characters causes the * length to exceed max_size(), length_error is thrown. If @a * __pos1 is beyond the end of this string or @a __pos2 is * beyond the end of @a __str, out_of_range is thrown. The * value of the string doesn't change if an error is thrown. */ basic_string& insert(size_type __pos1, const basic_string& __str, size_type __pos2, size_type __n = npos) { return this->insert(__pos1, __str._M_data() + __str._M_check(__pos2, "basic_string::insert"), __str._M_limit(__pos2, __n)); } /** * @brief Insert a C substring. * @param __pos Position in string to insert at. * @param __s The C string to insert. * @param __n The number of characters to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * @throw std::out_of_range If @a __pos is beyond the end of this * string. * * Inserts the first @a __n characters of @a __s starting at @a * __pos. If adding characters causes the length to exceed * max_size(), length_error is thrown. If @a __pos is beyond * end(), out_of_range is thrown. The value of the string * doesn't change if an error is thrown. */ basic_string& insert(size_type __pos, const _CharT* __s, size_type __n); /** * @brief Insert a C string. * @param __pos Position in string to insert at. * @param __s The C string to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * @throw std::out_of_range If @a pos is beyond the end of this * string. * * Inserts the first @a n characters of @a __s starting at @a __pos. If * adding characters causes the length to exceed max_size(), * length_error is thrown. If @a __pos is beyond end(), out_of_range is * thrown. The value of the string doesn't change if an error is * thrown. */ basic_string& insert(size_type __pos, const _CharT* __s) { __glibcxx_requires_string(__s); return this->insert(__pos, __s, traits_type::length(__s)); } /** * @brief Insert multiple characters. * @param __pos Index in string to insert at. * @param __n Number of characters to insert * @param __c The character to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * @throw std::out_of_range If @a __pos is beyond the end of this * string. * * Inserts @a __n copies of character @a __c starting at index * @a __pos. If adding characters causes the length to exceed * max_size(), length_error is thrown. If @a __pos > length(), * out_of_range is thrown. The value of the string doesn't * change if an error is thrown. */ basic_string& insert(size_type __pos, size_type __n, _CharT __c) { return _M_replace_aux(_M_check(__pos, "basic_string::insert"), size_type(0), __n, __c); } /** * @brief Insert one character. * @param __p Iterator referencing position in string to insert at. * @param __c The character to insert. * @return Iterator referencing newly inserted char. * @throw std::length_error If new length exceeds @c max_size(). * * Inserts character @a __c at position referenced by @a __p. * If adding character causes the length to exceed max_size(), * length_error is thrown. If @a __p is beyond end of string, * out_of_range is thrown. The value of the string doesn't * change if an error is thrown. */ iterator insert(iterator __p, _CharT __c) { _GLIBCXX_DEBUG_PEDASSERT(__p >= _M_ibegin() && __p <= _M_iend()); const size_type __pos = __p - _M_ibegin(); _M_replace_aux(__pos, size_type(0), size_type(1), __c); _M_rep()->_M_set_leaked(); return iterator(_M_data() + __pos); } #if __cplusplus >= 201703L /** * @brief Insert a string_view. * @param __pos Position in string to insert at. * @param __svt The object convertible to string_view to insert. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> insert(size_type __pos, const _Tp& __svt) { __sv_type __sv = __svt; return this->insert(__pos, __sv.data(), __sv.size()); } /** * @brief Insert a string_view. * @param __pos Position in string to insert at. * @param __svt The object convertible to string_view to insert from. * @param __pos Position in string_view to insert * from. * @param __n The number of characters to insert. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> insert(size_type __pos1, const _Tp& __svt, size_type __pos2, size_type __n = npos) { __sv_type __sv = __svt; return this->replace(__pos1, size_type(0), __sv.data() + std::__sv_check(__sv.size(), __pos2, "basic_string::insert"), std::__sv_limit(__sv.size(), __pos2, __n)); } #endif // C++17 /** * @brief Remove characters. * @param __pos Index of first character to remove (default 0). * @param __n Number of characters to remove (default remainder). * @return Reference to this string. * @throw std::out_of_range If @a pos is beyond the end of this * string. * * Removes @a __n characters from this string starting at @a * __pos. The length of the string is reduced by @a __n. If * there are < @a __n characters to remove, the remainder of * the string is truncated. If @a __p is beyond end of string, * out_of_range is thrown. The value of the string doesn't * change if an error is thrown. */ basic_string& erase(size_type __pos = 0, size_type __n = npos) { _M_mutate(_M_check(__pos, "basic_string::erase"), _M_limit(__pos, __n), size_type(0)); return *this; } /** * @brief Remove one character. * @param __position Iterator referencing the character to remove. * @return iterator referencing same location after removal. * * Removes the character at @a __position from this string. The value * of the string doesn't change if an error is thrown. */ iterator erase(iterator __position) { _GLIBCXX_DEBUG_PEDASSERT(__position >= _M_ibegin() && __position < _M_iend()); const size_type __pos = __position - _M_ibegin(); _M_mutate(__pos, size_type(1), size_type(0)); _M_rep()->_M_set_leaked(); return iterator(_M_data() + __pos); } /** * @brief Remove a range of characters. * @param __first Iterator referencing the first character to remove. * @param __last Iterator referencing the end of the range. * @return Iterator referencing location of first after removal. * * Removes the characters in the range [first,last) from this string. * The value of the string doesn't change if an error is thrown. */ iterator erase(iterator __first, iterator __last); #if __cplusplus >= 201103L /** * @brief Remove the last character. * * The string must be non-empty. */ void pop_back() // FIXME C++11: should be noexcept. { __glibcxx_assert(!empty()); erase(size() - 1, 1); } #endif // C++11 /** * @brief Replace characters with value from another string. * @param __pos Index of first character to replace. * @param __n Number of characters to be replaced. * @param __str String to insert. * @return Reference to this string. * @throw std::out_of_range If @a pos is beyond the end of this * string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__pos,__pos+__n) from * this string. In place, the value of @a __str is inserted. * If @a __pos is beyond end of string, out_of_range is thrown. * If the length of the result exceeds max_size(), length_error * is thrown. The value of the string doesn't change if an * error is thrown. */ basic_string& replace(size_type __pos, size_type __n, const basic_string& __str) { return this->replace(__pos, __n, __str._M_data(), __str.size()); } /** * @brief Replace characters with value from another string. * @param __pos1 Index of first character to replace. * @param __n1 Number of characters to be replaced. * @param __str String to insert. * @param __pos2 Index of first character of str to use. * @param __n2 Number of characters from str to use. * @return Reference to this string. * @throw std::out_of_range If @a __pos1 > size() or @a __pos2 > * __str.size(). * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__pos1,__pos1 + n) from this * string. In place, the value of @a __str is inserted. If @a __pos is * beyond end of string, out_of_range is thrown. If the length of the * result exceeds max_size(), length_error is thrown. The value of the * string doesn't change if an error is thrown. */ basic_string& replace(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2 = npos) { return this->replace(__pos1, __n1, __str._M_data() + __str._M_check(__pos2, "basic_string::replace"), __str._M_limit(__pos2, __n2)); } /** * @brief Replace characters with value of a C substring. * @param __pos Index of first character to replace. * @param __n1 Number of characters to be replaced. * @param __s C string to insert. * @param __n2 Number of characters from @a s to use. * @return Reference to this string. * @throw std::out_of_range If @a pos1 > size(). * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__pos,__pos + __n1) * from this string. In place, the first @a __n2 characters of * @a __s are inserted, or all of @a __s if @a __n2 is too large. If * @a __pos is beyond end of string, out_of_range is thrown. If * the length of result exceeds max_size(), length_error is * thrown. The value of the string doesn't change if an error * is thrown. */ basic_string& replace(size_type __pos, size_type __n1, const _CharT* __s, size_type __n2); /** * @brief Replace characters with value of a C string. * @param __pos Index of first character to replace. * @param __n1 Number of characters to be replaced. * @param __s C string to insert. * @return Reference to this string. * @throw std::out_of_range If @a pos > size(). * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__pos,__pos + __n1) * from this string. In place, the characters of @a __s are * inserted. If @a __pos is beyond end of string, out_of_range * is thrown. If the length of result exceeds max_size(), * length_error is thrown. The value of the string doesn't * change if an error is thrown. */ basic_string& replace(size_type __pos, size_type __n1, const _CharT* __s) { __glibcxx_requires_string(__s); return this->replace(__pos, __n1, __s, traits_type::length(__s)); } /** * @brief Replace characters with multiple characters. * @param __pos Index of first character to replace. * @param __n1 Number of characters to be replaced. * @param __n2 Number of characters to insert. * @param __c Character to insert. * @return Reference to this string. * @throw std::out_of_range If @a __pos > size(). * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [pos,pos + n1) from this * string. In place, @a __n2 copies of @a __c are inserted. * If @a __pos is beyond end of string, out_of_range is thrown. * If the length of result exceeds max_size(), length_error is * thrown. The value of the string doesn't change if an error * is thrown. */ basic_string& replace(size_type __pos, size_type __n1, size_type __n2, _CharT __c) { return _M_replace_aux(_M_check(__pos, "basic_string::replace"), _M_limit(__pos, __n1), __n2, __c); } /** * @brief Replace range of characters with string. * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __str String value to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * the value of @a __str is inserted. If the length of result * exceeds max_size(), length_error is thrown. The value of * the string doesn't change if an error is thrown. */ basic_string& replace(iterator __i1, iterator __i2, const basic_string& __str) { return this->replace(__i1, __i2, __str._M_data(), __str.size()); } /** * @brief Replace range of characters with C substring. * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __s C string value to insert. * @param __n Number of characters from s to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * the first @a __n characters of @a __s are inserted. If the * length of result exceeds max_size(), length_error is thrown. * The value of the string doesn't change if an error is * thrown. */ basic_string& replace(iterator __i1, iterator __i2, const _CharT* __s, size_type __n) { _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2 && __i2 <= _M_iend()); return this->replace(__i1 - _M_ibegin(), __i2 - __i1, __s, __n); } /** * @brief Replace range of characters with C string. * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __s C string value to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * the characters of @a __s are inserted. If the length of * result exceeds max_size(), length_error is thrown. The * value of the string doesn't change if an error is thrown. */ basic_string& replace(iterator __i1, iterator __i2, const _CharT* __s) { __glibcxx_requires_string(__s); return this->replace(__i1, __i2, __s, traits_type::length(__s)); } /** * @brief Replace range of characters with multiple characters * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __n Number of characters to insert. * @param __c Character to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * @a __n copies of @a __c are inserted. If the length of * result exceeds max_size(), length_error is thrown. The * value of the string doesn't change if an error is thrown. */ basic_string& replace(iterator __i1, iterator __i2, size_type __n, _CharT __c) { _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2 && __i2 <= _M_iend()); return _M_replace_aux(__i1 - _M_ibegin(), __i2 - __i1, __n, __c); } /** * @brief Replace range of characters with range. * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __k1 Iterator referencing start of range to insert. * @param __k2 Iterator referencing end of range to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * characters in the range [__k1,__k2) are inserted. If the * length of result exceeds max_size(), length_error is thrown. * The value of the string doesn't change if an error is * thrown. */ template<class _InputIterator> basic_string& replace(iterator __i1, iterator __i2, _InputIterator __k1, _InputIterator __k2) { _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2 && __i2 <= _M_iend()); __glibcxx_requires_valid_range(__k1, __k2); typedef typename std::__is_integer<_InputIterator>::__type _Integral; return _M_replace_dispatch(__i1, __i2, __k1, __k2, _Integral()); } // Specializations for the common case of pointer and iterator: // useful to avoid the overhead of temporary buffering in _M_replace. basic_string& replace(iterator __i1, iterator __i2, _CharT* __k1, _CharT* __k2) { _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2 && __i2 <= _M_iend()); __glibcxx_requires_valid_range(__k1, __k2); return this->replace(__i1 - _M_ibegin(), __i2 - __i1, __k1, __k2 - __k1); } basic_string& replace(iterator __i1, iterator __i2, const _CharT* __k1, const _CharT* __k2) { _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2 && __i2 <= _M_iend()); __glibcxx_requires_valid_range(__k1, __k2); return this->replace(__i1 - _M_ibegin(), __i2 - __i1, __k1, __k2 - __k1); } basic_string& replace(iterator __i1, iterator __i2, iterator __k1, iterator __k2) { _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2 && __i2 <= _M_iend()); __glibcxx_requires_valid_range(__k1, __k2); return this->replace(__i1 - _M_ibegin(), __i2 - __i1, __k1.base(), __k2 - __k1); } basic_string& replace(iterator __i1, iterator __i2, const_iterator __k1, const_iterator __k2) { _GLIBCXX_DEBUG_PEDASSERT(_M_ibegin() <= __i1 && __i1 <= __i2 && __i2 <= _M_iend()); __glibcxx_requires_valid_range(__k1, __k2); return this->replace(__i1 - _M_ibegin(), __i2 - __i1, __k1.base(), __k2 - __k1); } #if __cplusplus >= 201103L /** * @brief Replace range of characters with initializer_list. * @param __i1 Iterator referencing start of range to replace. * @param __i2 Iterator referencing end of range to replace. * @param __l The initializer_list of characters to insert. * @return Reference to this string. * @throw std::length_error If new length exceeds @c max_size(). * * Removes the characters in the range [__i1,__i2). In place, * characters in the range [__k1,__k2) are inserted. If the * length of result exceeds max_size(), length_error is thrown. * The value of the string doesn't change if an error is * thrown. */ basic_string& replace(iterator __i1, iterator __i2, initializer_list<_CharT> __l) { return this->replace(__i1, __i2, __l.begin(), __l.end()); } #endif // C++11 #if __cplusplus >= 201703L /** * @brief Replace range of characters with string_view. * @param __pos The position to replace at. * @param __n The number of characters to replace. * @param __svt The object convertible to string_view to insert. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> replace(size_type __pos, size_type __n, const _Tp& __svt) { __sv_type __sv = __svt; return this->replace(__pos, __n, __sv.data(), __sv.size()); } /** * @brief Replace range of characters with string_view. * @param __pos1 The position to replace at. * @param __n1 The number of characters to replace. * @param __svt The object convertible to string_view to insert from. * @param __pos2 The position in the string_view to insert from. * @param __n2 The number of characters to insert. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> replace(size_type __pos1, size_type __n1, const _Tp& __svt, size_type __pos2, size_type __n2 = npos) { __sv_type __sv = __svt; return this->replace(__pos1, __n1, __sv.data() + std::__sv_check(__sv.size(), __pos2, "basic_string::replace"), std::__sv_limit(__sv.size(), __pos2, __n2)); } /** * @brief Replace range of characters with string_view. * @param __i1 An iterator referencing the start position to replace at. * @param __i2 An iterator referencing the end position for the replace. * @param __svt The object convertible to string_view to insert from. * @return Reference to this string. */ template<typename _Tp> _If_sv<_Tp, basic_string&> replace(const_iterator __i1, const_iterator __i2, const _Tp& __svt) { __sv_type __sv = __svt; return this->replace(__i1 - begin(), __i2 - __i1, __sv); } #endif // C++17 private: template<class _Integer> basic_string& _M_replace_dispatch(iterator __i1, iterator __i2, _Integer __n, _Integer __val, __true_type) { return _M_replace_aux(__i1 - _M_ibegin(), __i2 - __i1, __n, __val); } template<class _InputIterator> basic_string& _M_replace_dispatch(iterator __i1, iterator __i2, _InputIterator __k1, _InputIterator __k2, __false_type); basic_string& _M_replace_aux(size_type __pos1, size_type __n1, size_type __n2, _CharT __c); basic_string& _M_replace_safe(size_type __pos1, size_type __n1, const _CharT* __s, size_type __n2); // _S_construct_aux is used to implement the 21.3.1 para 15 which // requires special behaviour if _InIter is an integral type template<class _InIterator> static _CharT* _S_construct_aux(_InIterator __beg, _InIterator __end, const _Alloc& __a, __false_type) { typedef typename iterator_traits<_InIterator>::iterator_category _Tag; return _S_construct(__beg, __end, __a, _Tag()); } // _GLIBCXX_RESOLVE_LIB_DEFECTS // 438. Ambiguity in the "do the right thing" clause template<class _Integer> static _CharT* _S_construct_aux(_Integer __beg, _Integer __end, const _Alloc& __a, __true_type) { return _S_construct_aux_2(static_cast<size_type>(__beg), __end, __a); } static _CharT* _S_construct_aux_2(size_type __req, _CharT __c, const _Alloc& __a) { return _S_construct(__req, __c, __a); } template<class _InIterator> static _CharT* _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a) { typedef typename std::__is_integer<_InIterator>::__type _Integral; return _S_construct_aux(__beg, __end, __a, _Integral()); } // For Input Iterators, used in istreambuf_iterators, etc. template<class _InIterator> static _CharT* _S_construct(_InIterator __beg, _InIterator __end, const _Alloc& __a, input_iterator_tag); // For forward_iterators up to random_access_iterators, used for // string::iterator, _CharT*, etc. template<class _FwdIterator> static _CharT* _S_construct(_FwdIterator __beg, _FwdIterator __end, const _Alloc& __a, forward_iterator_tag); static _CharT* _S_construct(size_type __req, _CharT __c, const _Alloc& __a); public: /** * @brief Copy substring into C string. * @param __s C string to copy value into. * @param __n Number of characters to copy. * @param __pos Index of first character to copy. * @return Number of characters actually copied * @throw std::out_of_range If __pos > size(). * * Copies up to @a __n characters starting at @a __pos into the * C string @a __s. If @a __pos is %greater than size(), * out_of_range is thrown. */ size_type copy(_CharT* __s, size_type __n, size_type __pos = 0) const; /** * @brief Swap contents with another string. * @param __s String to swap with. * * Exchanges the contents of this string with that of @a __s in constant * time. */ void swap(basic_string& __s) _GLIBCXX_NOEXCEPT_IF(allocator_traits<_Alloc>::is_always_equal::value); // String operations: /** * @brief Return const pointer to null-terminated contents. * * This is a handle to internal data. Do not modify or dire things may * happen. */ const _CharT* c_str() const _GLIBCXX_NOEXCEPT { return _M_data(); } /** * @brief Return const pointer to contents. * * This is a pointer to internal data. It is undefined to modify * the contents through the returned pointer. To get a pointer that * allows modifying the contents use @c &str[0] instead, * (or in C++17 the non-const @c str.data() overload). */ const _CharT* data() const _GLIBCXX_NOEXCEPT { return _M_data(); } #if __cplusplus >= 201703L /** * @brief Return non-const pointer to contents. * * This is a pointer to the character sequence held by the string. * Modifying the characters in the sequence is allowed. */ _CharT* data() noexcept { _M_leak(); return _M_data(); } #endif /** * @brief Return copy of allocator used to construct this string. */ allocator_type get_allocator() const _GLIBCXX_NOEXCEPT { return _M_dataplus; } /** * @brief Find position of a C substring. * @param __s C string to locate. * @param __pos Index of character to search from. * @param __n Number of characters from @a s to search for. * @return Index of start of first occurrence. * * Starting from @a __pos, searches forward for the first @a * __n characters in @a __s within this string. If found, * returns the index where it begins. If not found, returns * npos. */ size_type find(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find position of a string. * @param __str String to locate. * @param __pos Index of character to search from (default 0). * @return Index of start of first occurrence. * * Starting from @a __pos, searches forward for value of @a __str within * this string. If found, returns the index where it begins. If not * found, returns npos. */ size_type find(const basic_string& __str, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { return this->find(__str.data(), __pos, __str.size()); } /** * @brief Find position of a C string. * @param __s C string to locate. * @param __pos Index of character to search from (default 0). * @return Index of start of first occurrence. * * Starting from @a __pos, searches forward for the value of @a * __s within this string. If found, returns the index where * it begins. If not found, returns npos. */ size_type find(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->find(__s, __pos, traits_type::length(__s)); } /** * @brief Find position of a character. * @param __c Character to locate. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for @a __c within * this string. If found, returns the index where it was * found. If not found, returns npos. */ size_type find(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT; #if __cplusplus >= 201703L /** * @brief Find position of a string_view. * @param __svt The object convertible to string_view to locate. * @param __pos Index of character to search from (default 0). * @return Index of start of first occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> find(const _Tp& __svt, size_type __pos = 0) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->find(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find last position of a string. * @param __str String to locate. * @param __pos Index of character to search back from (default end). * @return Index of start of last occurrence. * * Starting from @a __pos, searches backward for value of @a * __str within this string. If found, returns the index where * it begins. If not found, returns npos. */ size_type rfind(const basic_string& __str, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { return this->rfind(__str.data(), __pos, __str.size()); } /** * @brief Find last position of a C substring. * @param __s C string to locate. * @param __pos Index of character to search back from. * @param __n Number of characters from s to search for. * @return Index of start of last occurrence. * * Starting from @a __pos, searches backward for the first @a * __n characters in @a __s within this string. If found, * returns the index where it begins. If not found, returns * npos. */ size_type rfind(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find last position of a C string. * @param __s C string to locate. * @param __pos Index of character to start search at (default end). * @return Index of start of last occurrence. * * Starting from @a __pos, searches backward for the value of * @a __s within this string. If found, returns the index * where it begins. If not found, returns npos. */ size_type rfind(const _CharT* __s, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->rfind(__s, __pos, traits_type::length(__s)); } /** * @brief Find last position of a character. * @param __c Character to locate. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for @a __c within * this string. If found, returns the index where it was * found. If not found, returns npos. */ size_type rfind(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT; #if __cplusplus >= 201703L /** * @brief Find last position of a string_view. * @param __svt The object convertible to string_view to locate. * @param __pos Index of character to search back from (default end). * @return Index of start of last occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> rfind(const _Tp& __svt, size_type __pos = npos) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->rfind(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find position of a character of string. * @param __str String containing characters to locate. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for one of the * characters of @a __str within this string. If found, * returns the index where it was found. If not found, returns * npos. */ size_type find_first_of(const basic_string& __str, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { return this->find_first_of(__str.data(), __pos, __str.size()); } /** * @brief Find position of a character of C substring. * @param __s String containing characters to locate. * @param __pos Index of character to search from. * @param __n Number of characters from s to search for. * @return Index of first occurrence. * * Starting from @a __pos, searches forward for one of the * first @a __n characters of @a __s within this string. If * found, returns the index where it was found. If not found, * returns npos. */ size_type find_first_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find position of a character of C string. * @param __s String containing characters to locate. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for one of the * characters of @a __s within this string. If found, returns * the index where it was found. If not found, returns npos. */ size_type find_first_of(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->find_first_of(__s, __pos, traits_type::length(__s)); } /** * @brief Find position of a character. * @param __c Character to locate. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for the character * @a __c within this string. If found, returns the index * where it was found. If not found, returns npos. * * Note: equivalent to find(__c, __pos). */ size_type find_first_of(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { return this->find(__c, __pos); } #if __cplusplus >= 201703L /** * @brief Find position of a character of a string_view. * @param __svt An object convertible to string_view containing * characters to locate. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> find_first_of(const _Tp& __svt, size_type __pos = 0) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->find_first_of(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find last position of a character of string. * @param __str String containing characters to locate. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for one of the * characters of @a __str within this string. If found, * returns the index where it was found. If not found, returns * npos. */ size_type find_last_of(const basic_string& __str, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { return this->find_last_of(__str.data(), __pos, __str.size()); } /** * @brief Find last position of a character of C substring. * @param __s C string containing characters to locate. * @param __pos Index of character to search back from. * @param __n Number of characters from s to search for. * @return Index of last occurrence. * * Starting from @a __pos, searches backward for one of the * first @a __n characters of @a __s within this string. If * found, returns the index where it was found. If not found, * returns npos. */ size_type find_last_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find last position of a character of C string. * @param __s C string containing characters to locate. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for one of the * characters of @a __s within this string. If found, returns * the index where it was found. If not found, returns npos. */ size_type find_last_of(const _CharT* __s, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->find_last_of(__s, __pos, traits_type::length(__s)); } /** * @brief Find last position of a character. * @param __c Character to locate. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for @a __c within * this string. If found, returns the index where it was * found. If not found, returns npos. * * Note: equivalent to rfind(__c, __pos). */ size_type find_last_of(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { return this->rfind(__c, __pos); } #if __cplusplus >= 201703L /** * @brief Find last position of a character of string. * @param __svt An object convertible to string_view containing * characters to locate. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> find_last_of(const _Tp& __svt, size_type __pos = npos) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->find_last_of(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find position of a character not in string. * @param __str String containing characters to avoid. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for a character not contained * in @a __str within this string. If found, returns the index where it * was found. If not found, returns npos. */ size_type find_first_not_of(const basic_string& __str, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { return this->find_first_not_of(__str.data(), __pos, __str.size()); } /** * @brief Find position of a character not in C substring. * @param __s C string containing characters to avoid. * @param __pos Index of character to search from. * @param __n Number of characters from __s to consider. * @return Index of first occurrence. * * Starting from @a __pos, searches forward for a character not * contained in the first @a __n characters of @a __s within * this string. If found, returns the index where it was * found. If not found, returns npos. */ size_type find_first_not_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find position of a character not in C string. * @param __s C string containing characters to avoid. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for a character not * contained in @a __s within this string. If found, returns * the index where it was found. If not found, returns npos. */ size_type find_first_not_of(const _CharT* __s, size_type __pos = 0) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->find_first_not_of(__s, __pos, traits_type::length(__s)); } /** * @brief Find position of a different character. * @param __c Character to avoid. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. * * Starting from @a __pos, searches forward for a character * other than @a __c within this string. If found, returns the * index where it was found. If not found, returns npos. */ size_type find_first_not_of(_CharT __c, size_type __pos = 0) const _GLIBCXX_NOEXCEPT; #if __cplusplus >= 201703L /** * @brief Find position of a character not in a string_view. * @param __svt An object convertible to string_view containing * characters to avoid. * @param __pos Index of character to search from (default 0). * @return Index of first occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> find_first_not_of(const _Tp& __svt, size_type __pos = 0) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->find_first_not_of(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Find last position of a character not in string. * @param __str String containing characters to avoid. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for a character * not contained in @a __str within this string. If found, * returns the index where it was found. If not found, returns * npos. */ size_type find_last_not_of(const basic_string& __str, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { return this->find_last_not_of(__str.data(), __pos, __str.size()); } /** * @brief Find last position of a character not in C substring. * @param __s C string containing characters to avoid. * @param __pos Index of character to search back from. * @param __n Number of characters from s to consider. * @return Index of last occurrence. * * Starting from @a __pos, searches backward for a character not * contained in the first @a __n characters of @a __s within this string. * If found, returns the index where it was found. If not found, * returns npos. */ size_type find_last_not_of(const _CharT* __s, size_type __pos, size_type __n) const _GLIBCXX_NOEXCEPT; /** * @brief Find last position of a character not in C string. * @param __s C string containing characters to avoid. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for a character * not contained in @a __s within this string. If found, * returns the index where it was found. If not found, returns * npos. */ size_type find_last_not_of(const _CharT* __s, size_type __pos = npos) const _GLIBCXX_NOEXCEPT { __glibcxx_requires_string(__s); return this->find_last_not_of(__s, __pos, traits_type::length(__s)); } /** * @brief Find last position of a different character. * @param __c Character to avoid. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. * * Starting from @a __pos, searches backward for a character other than * @a __c within this string. If found, returns the index where it was * found. If not found, returns npos. */ size_type find_last_not_of(_CharT __c, size_type __pos = npos) const _GLIBCXX_NOEXCEPT; #if __cplusplus >= 201703L /** * @brief Find last position of a character not in a string_view. * @param __svt An object convertible to string_view containing * characters to avoid. * @param __pos Index of character to search back from (default end). * @return Index of last occurrence. */ template<typename _Tp> _If_sv<_Tp, size_type> find_last_not_of(const _Tp& __svt, size_type __pos = npos) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return this->find_last_not_of(__sv.data(), __pos, __sv.size()); } #endif // C++17 /** * @brief Get a substring. * @param __pos Index of first character (default 0). * @param __n Number of characters in substring (default remainder). * @return The new string. * @throw std::out_of_range If __pos > size(). * * Construct and return a new string using the @a __n * characters starting at @a __pos. If the string is too * short, use the remainder of the characters. If @a __pos is * beyond the end of the string, out_of_range is thrown. */ basic_string substr(size_type __pos = 0, size_type __n = npos) const { return basic_string(*this, _M_check(__pos, "basic_string::substr"), __n); } /** * @brief Compare to a string. * @param __str String to compare against. * @return Integer < 0, 0, or > 0. * * Returns an integer < 0 if this string is ordered before @a * __str, 0 if their values are equivalent, or > 0 if this * string is ordered after @a __str. Determines the effective * length rlen of the strings to compare as the smallest of * size() and str.size(). The function then compares the two * strings by calling traits::compare(data(), str.data(),rlen). * If the result of the comparison is nonzero returns it, * otherwise the shorter one is ordered first. */ int compare(const basic_string& __str) const { const size_type __size = this->size(); const size_type __osize = __str.size(); const size_type __len = std::min(__size, __osize); int __r = traits_type::compare(_M_data(), __str.data(), __len); if (!__r) __r = _S_compare(__size, __osize); return __r; } #if __cplusplus >= 201703L /** * @brief Compare to a string_view. * @param __svt An object convertible to string_view to compare against. * @return Integer < 0, 0, or > 0. */ template<typename _Tp> _If_sv<_Tp, int> compare(const _Tp& __svt) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; const size_type __size = this->size(); const size_type __osize = __sv.size(); const size_type __len = std::min(__size, __osize); int __r = traits_type::compare(_M_data(), __sv.data(), __len); if (!__r) __r = _S_compare(__size, __osize); return __r; } /** * @brief Compare to a string_view. * @param __pos A position in the string to start comparing from. * @param __n The number of characters to compare. * @param __svt An object convertible to string_view to compare * against. * @return Integer < 0, 0, or > 0. */ template<typename _Tp> _If_sv<_Tp, int> compare(size_type __pos, size_type __n, const _Tp& __svt) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return __sv_type(*this).substr(__pos, __n).compare(__sv); } /** * @brief Compare to a string_view. * @param __pos1 A position in the string to start comparing from. * @param __n1 The number of characters to compare. * @param __svt An object convertible to string_view to compare * against. * @param __pos2 A position in the string_view to start comparing from. * @param __n2 The number of characters to compare. * @return Integer < 0, 0, or > 0. */ template<typename _Tp> _If_sv<_Tp, int> compare(size_type __pos1, size_type __n1, const _Tp& __svt, size_type __pos2, size_type __n2 = npos) const noexcept(is_same<_Tp, __sv_type>::value) { __sv_type __sv = __svt; return __sv_type(*this) .substr(__pos1, __n1).compare(__sv.substr(__pos2, __n2)); } #endif // C++17 /** * @brief Compare substring to a string. * @param __pos Index of first character of substring. * @param __n Number of characters in substring. * @param __str String to compare against. * @return Integer < 0, 0, or > 0. * * Form the substring of this string from the @a __n characters * starting at @a __pos. Returns an integer < 0 if the * substring is ordered before @a __str, 0 if their values are * equivalent, or > 0 if the substring is ordered after @a * __str. Determines the effective length rlen of the strings * to compare as the smallest of the length of the substring * and @a __str.size(). The function then compares the two * strings by calling * traits::compare(substring.data(),str.data(),rlen). If the * result of the comparison is nonzero returns it, otherwise * the shorter one is ordered first. */ int compare(size_type __pos, size_type __n, const basic_string& __str) const; /** * @brief Compare substring to a substring. * @param __pos1 Index of first character of substring. * @param __n1 Number of characters in substring. * @param __str String to compare against. * @param __pos2 Index of first character of substring of str. * @param __n2 Number of characters in substring of str. * @return Integer < 0, 0, or > 0. * * Form the substring of this string from the @a __n1 * characters starting at @a __pos1. Form the substring of @a * __str from the @a __n2 characters starting at @a __pos2. * Returns an integer < 0 if this substring is ordered before * the substring of @a __str, 0 if their values are equivalent, * or > 0 if this substring is ordered after the substring of * @a __str. Determines the effective length rlen of the * strings to compare as the smallest of the lengths of the * substrings. The function then compares the two strings by * calling * traits::compare(substring.data(),str.substr(pos2,n2).data(),rlen). * If the result of the comparison is nonzero returns it, * otherwise the shorter one is ordered first. */ int compare(size_type __pos1, size_type __n1, const basic_string& __str, size_type __pos2, size_type __n2 = npos) const; /** * @brief Compare to a C string. * @param __s C string to compare against. * @return Integer < 0, 0, or > 0. * * Returns an integer < 0 if this string is ordered before @a __s, 0 if * their values are equivalent, or > 0 if this string is ordered after * @a __s. Determines the effective length rlen of the strings to * compare as the smallest of size() and the length of a string * constructed from @a __s. The function then compares the two strings * by calling traits::compare(data(),s,rlen). If the result of the * comparison is nonzero returns it, otherwise the shorter one is * ordered first. */ int compare(const _CharT* __s) const _GLIBCXX_NOEXCEPT; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 5 String::compare specification questionable /** * @brief Compare substring to a C string. * @param __pos Index of first character of substring. * @param __n1 Number of characters in substring. * @param __s C string to compare against. * @return Integer < 0, 0, or > 0. * * Form the substring of this string from the @a __n1 * characters starting at @a pos. Returns an integer < 0 if * the substring is ordered before @a __s, 0 if their values * are equivalent, or > 0 if the substring is ordered after @a * __s. Determines the effective length rlen of the strings to * compare as the smallest of the length of the substring and * the length of a string constructed from @a __s. The * function then compares the two string by calling * traits::compare(substring.data(),__s,rlen). If the result of * the comparison is nonzero returns it, otherwise the shorter * one is ordered first. */ int compare(size_type __pos, size_type __n1, const _CharT* __s) const; /** * @brief Compare substring against a character %array. * @param __pos Index of first character of substring. * @param __n1 Number of characters in substring. * @param __s character %array to compare against. * @param __n2 Number of characters of s. * @return Integer < 0, 0, or > 0. * * Form the substring of this string from the @a __n1 * characters starting at @a __pos. Form a string from the * first @a __n2 characters of @a __s. Returns an integer < 0 * if this substring is ordered before the string from @a __s, * 0 if their values are equivalent, or > 0 if this substring * is ordered after the string from @a __s. Determines the * effective length rlen of the strings to compare as the * smallest of the length of the substring and @a __n2. The * function then compares the two strings by calling * traits::compare(substring.data(),s,rlen). If the result of * the comparison is nonzero returns it, otherwise the shorter * one is ordered first. * * NB: s must have at least n2 characters, '\\0' has * no special meaning. */ int compare(size_type __pos, size_type __n1, const _CharT* __s, size_type __n2) const; #if __cplusplus > 201703L bool starts_with(basic_string_view<_CharT, _Traits> __x) const noexcept { return __sv_type(this->data(), this->size()).starts_with(__x); } bool starts_with(_CharT __x) const noexcept { return __sv_type(this->data(), this->size()).starts_with(__x); } bool starts_with(const _CharT* __x) const noexcept { return __sv_type(this->data(), this->size()).starts_with(__x); } bool ends_with(basic_string_view<_CharT, _Traits> __x) const noexcept { return __sv_type(this->data(), this->size()).ends_with(__x); } bool ends_with(_CharT __x) const noexcept { return __sv_type(this->data(), this->size()).ends_with(__x); } bool ends_with(const _CharT* __x) const noexcept { return __sv_type(this->data(), this->size()).ends_with(__x); } #endif // C++20 # ifdef _GLIBCXX_TM_TS_INTERNAL friend void ::_txnal_cow_string_C1_for_exceptions(void* that, const char* s, void* exc); friend const char* ::_txnal_cow_string_c_str(const void *that); friend void ::_txnal_cow_string_D1(void *that); friend void ::_txnal_cow_string_D1_commit(void *that); # endif }; #endif // !_GLIBCXX_USE_CXX11_ABI #if __cpp_deduction_guides >= 201606 _GLIBCXX_BEGIN_NAMESPACE_CXX11 template<typename _InputIterator, typename _CharT = typename iterator_traits<_InputIterator>::value_type, typename _Allocator = allocator<_CharT>, typename = _RequireInputIter<_InputIterator>, typename = _RequireAllocator<_Allocator>> basic_string(_InputIterator, _InputIterator, _Allocator = _Allocator()) -> basic_string<_CharT, char_traits<_CharT>, _Allocator>; // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3075. basic_string needs deduction guides from basic_string_view template<typename _CharT, typename _Traits, typename _Allocator = allocator<_CharT>, typename = _RequireAllocator<_Allocator>> basic_string(basic_string_view<_CharT, _Traits>, const _Allocator& = _Allocator()) -> basic_string<_CharT, _Traits, _Allocator>; template<typename _CharT, typename _Traits, typename _Allocator = allocator<_CharT>, typename = _RequireAllocator<_Allocator>> basic_string(basic_string_view<_CharT, _Traits>, typename basic_string<_CharT, _Traits, _Allocator>::size_type, typename basic_string<_CharT, _Traits, _Allocator>::size_type, const _Allocator& = _Allocator()) -> basic_string<_CharT, _Traits, _Allocator>; _GLIBCXX_END_NAMESPACE_CXX11 #endif // operator+ /** * @brief Concatenate two strings. * @param __lhs First string. * @param __rhs Last string. * @return New string with value of @a __lhs followed by @a __rhs. */ template<typename _CharT, typename _Traits, typename _Alloc> basic_string<_CharT, _Traits, _Alloc> operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) { basic_string<_CharT, _Traits, _Alloc> __str(__lhs); __str.append(__rhs); return __str; } /** * @brief Concatenate C string and string. * @param __lhs First string. * @param __rhs Last string. * @return New string with value of @a __lhs followed by @a __rhs. */ template<typename _CharT, typename _Traits, typename _Alloc> basic_string<_CharT,_Traits,_Alloc> operator+(const _CharT* __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs); /** * @brief Concatenate character and string. * @param __lhs First string. * @param __rhs Last string. * @return New string with @a __lhs followed by @a __rhs. */ template<typename _CharT, typename _Traits, typename _Alloc> basic_string<_CharT,_Traits,_Alloc> operator+(_CharT __lhs, const basic_string<_CharT,_Traits,_Alloc>& __rhs); /** * @brief Concatenate string and C string. * @param __lhs First string. * @param __rhs Last string. * @return New string with @a __lhs followed by @a __rhs. */ template<typename _CharT, typename _Traits, typename _Alloc> inline basic_string<_CharT, _Traits, _Alloc> operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const _CharT* __rhs) { basic_string<_CharT, _Traits, _Alloc> __str(__lhs); __str.append(__rhs); return __str; } /** * @brief Concatenate string and character. * @param __lhs First string. * @param __rhs Last string. * @return New string with @a __lhs followed by @a __rhs. */ template<typename _CharT, typename _Traits, typename _Alloc> inline basic_string<_CharT, _Traits, _Alloc> operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, _CharT __rhs) { typedef basic_string<_CharT, _Traits, _Alloc> __string_type; typedef typename __string_type::size_type __size_type; __string_type __str(__lhs); __str.append(__size_type(1), __rhs); return __str; } #if __cplusplus >= 201103L template<typename _CharT, typename _Traits, typename _Alloc> inline basic_string<_CharT, _Traits, _Alloc> operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) { return std::move(__lhs.append(__rhs)); } template<typename _CharT, typename _Traits, typename _Alloc> inline basic_string<_CharT, _Traits, _Alloc> operator+(const basic_string<_CharT, _Traits, _Alloc>& __lhs, basic_string<_CharT, _Traits, _Alloc>&& __rhs) { return std::move(__rhs.insert(0, __lhs)); } template<typename _CharT, typename _Traits, typename _Alloc> inline basic_string<_CharT, _Traits, _Alloc> operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs, basic_string<_CharT, _Traits, _Alloc>&& __rhs) { #if _GLIBCXX_USE_CXX11_ABI using _Alloc_traits = allocator_traits<_Alloc>; bool __use_rhs = false; if _GLIBCXX17_CONSTEXPR (typename _Alloc_traits::is_always_equal{}) __use_rhs = true; else if (__lhs.get_allocator() == __rhs.get_allocator()) __use_rhs = true; if (__use_rhs) #endif { const auto __size = __lhs.size() + __rhs.size(); if (__size > __lhs.capacity() && __size <= __rhs.capacity()) return std::move(__rhs.insert(0, __lhs)); } return std::move(__lhs.append(__rhs)); } template<typename _CharT, typename _Traits, typename _Alloc> inline basic_string<_CharT, _Traits, _Alloc> operator+(const _CharT* __lhs, basic_string<_CharT, _Traits, _Alloc>&& __rhs) { return std::move(__rhs.insert(0, __lhs)); } template<typename _CharT, typename _Traits, typename _Alloc> inline basic_string<_CharT, _Traits, _Alloc> operator+(_CharT __lhs, basic_string<_CharT, _Traits, _Alloc>&& __rhs) { return std::move(__rhs.insert(0, 1, __lhs)); } template<typename _CharT, typename _Traits, typename _Alloc> inline basic_string<_CharT, _Traits, _Alloc> operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs, const _CharT* __rhs) { return std::move(__lhs.append(__rhs)); } template<typename _CharT, typename _Traits, typename _Alloc> inline basic_string<_CharT, _Traits, _Alloc> operator+(basic_string<_CharT, _Traits, _Alloc>&& __lhs, _CharT __rhs) { return std::move(__lhs.append(1, __rhs)); } #endif // operator == /** * @brief Test equivalence of two strings. * @param __lhs First string. * @param __rhs Second string. * @return True if @a __lhs.compare(@a __rhs) == 0. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) _GLIBCXX_NOEXCEPT { return __lhs.compare(__rhs) == 0; } template<typename _CharT> inline typename __gnu_cxx::__enable_if<__is_char<_CharT>::__value, bool>::__type operator==(const basic_string<_CharT>& __lhs, const basic_string<_CharT>& __rhs) _GLIBCXX_NOEXCEPT { return (__lhs.size() == __rhs.size() && !std::char_traits<_CharT>::compare(__lhs.data(), __rhs.data(), __lhs.size())); } /** * @brief Test equivalence of string and C string. * @param __lhs String. * @param __rhs C string. * @return True if @a __lhs.compare(@a __rhs) == 0. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator==(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const _CharT* __rhs) { return __lhs.compare(__rhs) == 0; } #if __cpp_lib_three_way_comparison /** * @brief Three-way comparison of a string and a C string. * @param __lhs A string. * @param __rhs A null-terminated string. * @return A value indicating whether `__lhs` is less than, equal to, * greater than, or incomparable with `__rhs`. */ template<typename _CharT, typename _Traits, typename _Alloc> inline auto operator<=>(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) noexcept -> decltype(__detail::__char_traits_cmp_cat<_Traits>(0)) { return __detail::__char_traits_cmp_cat<_Traits>(__lhs.compare(__rhs)); } /** * @brief Three-way comparison of a string and a C string. * @param __lhs A string. * @param __rhs A null-terminated string. * @return A value indicating whether `__lhs` is less than, equal to, * greater than, or incomparable with `__rhs`. */ template<typename _CharT, typename _Traits, typename _Alloc> inline auto operator<=>(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const _CharT* __rhs) noexcept -> decltype(__detail::__char_traits_cmp_cat<_Traits>(0)) { return __detail::__char_traits_cmp_cat<_Traits>(__lhs.compare(__rhs)); } #else /** * @brief Test equivalence of C string and string. * @param __lhs C string. * @param __rhs String. * @return True if @a __rhs.compare(@a __lhs) == 0. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator==(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) { return __rhs.compare(__lhs) == 0; } // operator != /** * @brief Test difference of two strings. * @param __lhs First string. * @param __rhs Second string. * @return True if @a __lhs.compare(@a __rhs) != 0. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) _GLIBCXX_NOEXCEPT { return !(__lhs == __rhs); } /** * @brief Test difference of C string and string. * @param __lhs C string. * @param __rhs String. * @return True if @a __rhs.compare(@a __lhs) != 0. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator!=(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) { return !(__lhs == __rhs); } /** * @brief Test difference of string and C string. * @param __lhs String. * @param __rhs C string. * @return True if @a __lhs.compare(@a __rhs) != 0. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator!=(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const _CharT* __rhs) { return !(__lhs == __rhs); } // operator < /** * @brief Test if string precedes string. * @param __lhs First string. * @param __rhs Second string. * @return True if @a __lhs precedes @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) _GLIBCXX_NOEXCEPT { return __lhs.compare(__rhs) < 0; } /** * @brief Test if string precedes C string. * @param __lhs String. * @param __rhs C string. * @return True if @a __lhs precedes @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator<(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const _CharT* __rhs) { return __lhs.compare(__rhs) < 0; } /** * @brief Test if C string precedes string. * @param __lhs C string. * @param __rhs String. * @return True if @a __lhs precedes @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator<(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) { return __rhs.compare(__lhs) > 0; } // operator > /** * @brief Test if string follows string. * @param __lhs First string. * @param __rhs Second string. * @return True if @a __lhs follows @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) _GLIBCXX_NOEXCEPT { return __lhs.compare(__rhs) > 0; } /** * @brief Test if string follows C string. * @param __lhs String. * @param __rhs C string. * @return True if @a __lhs follows @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator>(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const _CharT* __rhs) { return __lhs.compare(__rhs) > 0; } /** * @brief Test if C string follows string. * @param __lhs C string. * @param __rhs String. * @return True if @a __lhs follows @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator>(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) { return __rhs.compare(__lhs) < 0; } // operator <= /** * @brief Test if string doesn't follow string. * @param __lhs First string. * @param __rhs Second string. * @return True if @a __lhs doesn't follow @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) _GLIBCXX_NOEXCEPT { return __lhs.compare(__rhs) <= 0; } /** * @brief Test if string doesn't follow C string. * @param __lhs String. * @param __rhs C string. * @return True if @a __lhs doesn't follow @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator<=(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const _CharT* __rhs) { return __lhs.compare(__rhs) <= 0; } /** * @brief Test if C string doesn't follow string. * @param __lhs C string. * @param __rhs String. * @return True if @a __lhs doesn't follow @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator<=(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) { return __rhs.compare(__lhs) >= 0; } // operator >= /** * @brief Test if string doesn't precede string. * @param __lhs First string. * @param __rhs Second string. * @return True if @a __lhs doesn't precede @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator>=(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) _GLIBCXX_NOEXCEPT { return __lhs.compare(__rhs) >= 0; } /** * @brief Test if string doesn't precede C string. * @param __lhs String. * @param __rhs C string. * @return True if @a __lhs doesn't precede @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator>=(const basic_string<_CharT, _Traits, _Alloc>& __lhs, const _CharT* __rhs) { return __lhs.compare(__rhs) >= 0; } /** * @brief Test if C string doesn't precede string. * @param __lhs C string. * @param __rhs String. * @return True if @a __lhs doesn't precede @a __rhs. False otherwise. */ template<typename _CharT, typename _Traits, typename _Alloc> inline bool operator>=(const _CharT* __lhs, const basic_string<_CharT, _Traits, _Alloc>& __rhs) { return __rhs.compare(__lhs) <= 0; } #endif // three-way comparison /** * @brief Swap contents of two strings. * @param __lhs First string. * @param __rhs Second string. * * Exchanges the contents of @a __lhs and @a __rhs in constant time. */ template<typename _CharT, typename _Traits, typename _Alloc> inline void swap(basic_string<_CharT, _Traits, _Alloc>& __lhs, basic_string<_CharT, _Traits, _Alloc>& __rhs) _GLIBCXX_NOEXCEPT_IF(noexcept(__lhs.swap(__rhs))) { __lhs.swap(__rhs); } /** * @brief Read stream into a string. * @param __is Input stream. * @param __str Buffer to store into. * @return Reference to the input stream. * * Stores characters from @a __is into @a __str until whitespace is * found, the end of the stream is encountered, or str.max_size() * is reached. If is.width() is non-zero, that is the limit on the * number of characters stored into @a __str. Any previous * contents of @a __str are erased. */ template<typename _CharT, typename _Traits, typename _Alloc> basic_istream<_CharT, _Traits>& operator>>(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Alloc>& __str); template<> basic_istream<char>& operator>>(basic_istream<char>& __is, basic_string<char>& __str); /** * @brief Write string to a stream. * @param __os Output stream. * @param __str String to write out. * @return Reference to the output stream. * * Output characters of @a __str into os following the same rules as for * writing a C string. */ template<typename _CharT, typename _Traits, typename _Alloc> inline basic_ostream<_CharT, _Traits>& operator<<(basic_ostream<_CharT, _Traits>& __os, const basic_string<_CharT, _Traits, _Alloc>& __str) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 586. string inserter not a formatted function return __ostream_insert(__os, __str.data(), __str.size()); } /** * @brief Read a line from stream into a string. * @param __is Input stream. * @param __str Buffer to store into. * @param __delim Character marking end of line. * @return Reference to the input stream. * * Stores characters from @a __is into @a __str until @a __delim is * found, the end of the stream is encountered, or str.max_size() * is reached. Any previous contents of @a __str are erased. If * @a __delim is encountered, it is extracted but not stored into * @a __str. */ template<typename _CharT, typename _Traits, typename _Alloc> basic_istream<_CharT, _Traits>& getline(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim); /** * @brief Read a line from stream into a string. * @param __is Input stream. * @param __str Buffer to store into. * @return Reference to the input stream. * * Stores characters from is into @a __str until '\n' is * found, the end of the stream is encountered, or str.max_size() * is reached. Any previous contents of @a __str are erased. If * end of line is encountered, it is extracted but not stored into * @a __str. */ template<typename _CharT, typename _Traits, typename _Alloc> inline basic_istream<_CharT, _Traits>& getline(basic_istream<_CharT, _Traits>& __is, basic_string<_CharT, _Traits, _Alloc>& __str) { return std::getline(__is, __str, __is.widen('\n')); } #if __cplusplus >= 201103L /// Read a line from an rvalue stream into a string. template<typename _CharT, typename _Traits, typename _Alloc> inline basic_istream<_CharT, _Traits>& getline(basic_istream<_CharT, _Traits>&& __is, basic_string<_CharT, _Traits, _Alloc>& __str, _CharT __delim) { return std::getline(__is, __str, __delim); } /// Read a line from an rvalue stream into a string. template<typename _CharT, typename _Traits, typename _Alloc> inline basic_istream<_CharT, _Traits>& getline(basic_istream<_CharT, _Traits>&& __is, basic_string<_CharT, _Traits, _Alloc>& __str) { return std::getline(__is, __str); } #endif template<> basic_istream<char>& getline(basic_istream<char>& __in, basic_string<char>& __str, char __delim); #ifdef _GLIBCXX_USE_WCHAR_T template<> basic_istream<wchar_t>& getline(basic_istream<wchar_t>& __in, basic_string<wchar_t>& __str, wchar_t __delim); #endif _GLIBCXX_END_NAMESPACE_VERSION } // namespace #if __cplusplus >= 201103L #include <ext/string_conversions.h> #include <bits/charconv.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION _GLIBCXX_BEGIN_NAMESPACE_CXX11 #if _GLIBCXX_USE_C99_STDLIB // 21.4 Numeric Conversions [string.conversions]. inline int stoi(const string& __str, size_t* __idx = 0, int __base = 10) { return __gnu_cxx::__stoa<long, int>(&std::strtol, "stoi", __str.c_str(), __idx, __base); } inline long stol(const string& __str, size_t* __idx = 0, int __base = 10) { return __gnu_cxx::__stoa(&std::strtol, "stol", __str.c_str(), __idx, __base); } inline unsigned long stoul(const string& __str, size_t* __idx = 0, int __base = 10) { return __gnu_cxx::__stoa(&std::strtoul, "stoul", __str.c_str(), __idx, __base); } inline long long stoll(const string& __str, size_t* __idx = 0, int __base = 10) { return __gnu_cxx::__stoa(&std::strtoll, "stoll", __str.c_str(), __idx, __base); } inline unsigned long long stoull(const string& __str, size_t* __idx = 0, int __base = 10) { return __gnu_cxx::__stoa(&std::strtoull, "stoull", __str.c_str(), __idx, __base); } // NB: strtof vs strtod. inline float stof(const string& __str, size_t* __idx = 0) { return __gnu_cxx::__stoa(&std::strtof, "stof", __str.c_str(), __idx); } inline double stod(const string& __str, size_t* __idx = 0) { return __gnu_cxx::__stoa(&std::strtod, "stod", __str.c_str(), __idx); } inline long double stold(const string& __str, size_t* __idx = 0) { return __gnu_cxx::__stoa(&std::strtold, "stold", __str.c_str(), __idx); } #endif // _GLIBCXX_USE_C99_STDLIB // DR 1261. Insufficent overloads for to_string / to_wstring inline string to_string(int __val) { const bool __neg = __val < 0; const unsigned __uval = __neg ? (unsigned)~__val + 1u : __val; const auto __len = __detail::__to_chars_len(__uval); string __str(__neg + __len, '-'); __detail::__to_chars_10_impl(&__str[__neg], __len, __uval); return __str; } inline string to_string(unsigned __val) { string __str(__detail::__to_chars_len(__val), '\0'); __detail::__to_chars_10_impl(&__str[0], __str.size(), __val); return __str; } inline string to_string(long __val) { const bool __neg = __val < 0; const unsigned long __uval = __neg ? (unsigned long)~__val + 1ul : __val; const auto __len = __detail::__to_chars_len(__uval); string __str(__neg + __len, '-'); __detail::__to_chars_10_impl(&__str[__neg], __len, __uval); return __str; } inline string to_string(unsigned long __val) { string __str(__detail::__to_chars_len(__val), '\0'); __detail::__to_chars_10_impl(&__str[0], __str.size(), __val); return __str; } inline string to_string(long long __val) { const bool __neg = __val < 0; const unsigned long long __uval = __neg ? (unsigned long long)~__val + 1ull : __val; const auto __len = __detail::__to_chars_len(__uval); string __str(__neg + __len, '-'); __detail::__to_chars_10_impl(&__str[__neg], __len, __uval); return __str; } inline string to_string(unsigned long long __val) { string __str(__detail::__to_chars_len(__val), '\0'); __detail::__to_chars_10_impl(&__str[0], __str.size(), __val); return __str; } #if _GLIBCXX_USE_C99_STDIO // NB: (v)snprintf vs sprintf. inline string to_string(float __val) { const int __n = __gnu_cxx::__numeric_traits<float>::__max_exponent10 + 20; return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, __n, "%f", __val); } inline string to_string(double __val) { const int __n = __gnu_cxx::__numeric_traits<double>::__max_exponent10 + 20; return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, __n, "%f", __val); } inline string to_string(long double __val) { const int __n = __gnu_cxx::__numeric_traits<long double>::__max_exponent10 + 20; return __gnu_cxx::__to_xstring<string>(&std::vsnprintf, __n, "%Lf", __val); } #endif // _GLIBCXX_USE_C99_STDIO #if defined(_GLIBCXX_USE_WCHAR_T) && _GLIBCXX_USE_C99_WCHAR inline int stoi(const wstring& __str, size_t* __idx = 0, int __base = 10) { return __gnu_cxx::__stoa<long, int>(&std::wcstol, "stoi", __str.c_str(), __idx, __base); } inline long stol(const wstring& __str, size_t* __idx = 0, int __base = 10) { return __gnu_cxx::__stoa(&std::wcstol, "stol", __str.c_str(), __idx, __base); } inline unsigned long stoul(const wstring& __str, size_t* __idx = 0, int __base = 10) { return __gnu_cxx::__stoa(&std::wcstoul, "stoul", __str.c_str(), __idx, __base); } inline long long stoll(const wstring& __str, size_t* __idx = 0, int __base = 10) { return __gnu_cxx::__stoa(&std::wcstoll, "stoll", __str.c_str(), __idx, __base); } inline unsigned long long stoull(const wstring& __str, size_t* __idx = 0, int __base = 10) { return __gnu_cxx::__stoa(&std::wcstoull, "stoull", __str.c_str(), __idx, __base); } // NB: wcstof vs wcstod. inline float stof(const wstring& __str, size_t* __idx = 0) { return __gnu_cxx::__stoa(&std::wcstof, "stof", __str.c_str(), __idx); } inline double stod(const wstring& __str, size_t* __idx = 0) { return __gnu_cxx::__stoa(&std::wcstod, "stod", __str.c_str(), __idx); } inline long double stold(const wstring& __str, size_t* __idx = 0) { return __gnu_cxx::__stoa(&std::wcstold, "stold", __str.c_str(), __idx); } #ifndef _GLIBCXX_HAVE_BROKEN_VSWPRINTF // DR 1261. inline wstring to_wstring(int __val) { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, 4 * sizeof(int), L"%d", __val); } inline wstring to_wstring(unsigned __val) { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, 4 * sizeof(unsigned), L"%u", __val); } inline wstring to_wstring(long __val) { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, 4 * sizeof(long), L"%ld", __val); } inline wstring to_wstring(unsigned long __val) { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, 4 * sizeof(unsigned long), L"%lu", __val); } inline wstring to_wstring(long long __val) { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, 4 * sizeof(long long), L"%lld", __val); } inline wstring to_wstring(unsigned long long __val) { return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, 4 * sizeof(unsigned long long), L"%llu", __val); } inline wstring to_wstring(float __val) { const int __n = __gnu_cxx::__numeric_traits<float>::__max_exponent10 + 20; return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, __n, L"%f", __val); } inline wstring to_wstring(double __val) { const int __n = __gnu_cxx::__numeric_traits<double>::__max_exponent10 + 20; return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, __n, L"%f", __val); } inline wstring to_wstring(long double __val) { const int __n = __gnu_cxx::__numeric_traits<long double>::__max_exponent10 + 20; return __gnu_cxx::__to_xstring<wstring>(&std::vswprintf, __n, L"%Lf", __val); } #endif // _GLIBCXX_HAVE_BROKEN_VSWPRINTF #endif // _GLIBCXX_USE_WCHAR_T && _GLIBCXX_USE_C99_WCHAR _GLIBCXX_END_NAMESPACE_CXX11 _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif /* C++11 */ #if __cplusplus >= 201103L #include <bits/functional_hash.h> namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION // DR 1182. #ifndef _GLIBCXX_COMPATIBILITY_CXX0X /// std::hash specialization for string. template<> struct hash<string> : public __hash_base<size_t, string> { size_t operator()(const string& __s) const noexcept { return std::_Hash_impl::hash(__s.data(), __s.length()); } }; template<> struct __is_fast_hash<hash<string>> : std::false_type { }; #ifdef _GLIBCXX_USE_WCHAR_T /// std::hash specialization for wstring. template<> struct hash<wstring> : public __hash_base<size_t, wstring> { size_t operator()(const wstring& __s) const noexcept { return std::_Hash_impl::hash(__s.data(), __s.length() * sizeof(wchar_t)); } }; template<> struct __is_fast_hash<hash<wstring>> : std::false_type { }; #endif #endif /* _GLIBCXX_COMPATIBILITY_CXX0X */ #ifdef _GLIBCXX_USE_CHAR8_T /// std::hash specialization for u8string. template<> struct hash<u8string> : public __hash_base<size_t, u8string> { size_t operator()(const u8string& __s) const noexcept { return std::_Hash_impl::hash(__s.data(), __s.length() * sizeof(char8_t)); } }; template<> struct __is_fast_hash<hash<u8string>> : std::false_type { }; #endif /// std::hash specialization for u16string. template<> struct hash<u16string> : public __hash_base<size_t, u16string> { size_t operator()(const u16string& __s) const noexcept { return std::_Hash_impl::hash(__s.data(), __s.length() * sizeof(char16_t)); } }; template<> struct __is_fast_hash<hash<u16string>> : std::false_type { }; /// std::hash specialization for u32string. template<> struct hash<u32string> : public __hash_base<size_t, u32string> { size_t operator()(const u32string& __s) const noexcept { return std::_Hash_impl::hash(__s.data(), __s.length() * sizeof(char32_t)); } }; template<> struct __is_fast_hash<hash<u32string>> : std::false_type { }; #if __cplusplus >= 201402L #define __cpp_lib_string_udls 201304 inline namespace literals { inline namespace string_literals { #pragma GCC diagnostic push #pragma GCC diagnostic ignored "-Wliteral-suffix" _GLIBCXX_DEFAULT_ABI_TAG inline basic_string<char> operator""s(const char* __str, size_t __len) { return basic_string<char>{__str, __len}; } #ifdef _GLIBCXX_USE_WCHAR_T _GLIBCXX_DEFAULT_ABI_TAG inline basic_string<wchar_t> operator""s(const wchar_t* __str, size_t __len) { return basic_string<wchar_t>{__str, __len}; } #endif #ifdef _GLIBCXX_USE_CHAR8_T _GLIBCXX_DEFAULT_ABI_TAG inline basic_string<char8_t> operator""s(const char8_t* __str, size_t __len) { return basic_string<char8_t>{__str, __len}; } #endif _GLIBCXX_DEFAULT_ABI_TAG inline basic_string<char16_t> operator""s(const char16_t* __str, size_t __len) { return basic_string<char16_t>{__str, __len}; } _GLIBCXX_DEFAULT_ABI_TAG inline basic_string<char32_t> operator""s(const char32_t* __str, size_t __len) { return basic_string<char32_t>{__str, __len}; } #pragma GCC diagnostic pop } // inline namespace string_literals } // inline namespace literals #if __cplusplus >= 201703L namespace __detail::__variant { template<typename> struct _Never_valueless_alt; // see <variant> // Provide the strong exception-safety guarantee when emplacing a // basic_string into a variant, but only if moving the string cannot throw. template<typename _Tp, typename _Traits, typename _Alloc> struct _Never_valueless_alt<std::basic_string<_Tp, _Traits, _Alloc>> : __and_< is_nothrow_move_constructible<std::basic_string<_Tp, _Traits, _Alloc>>, is_nothrow_move_assignable<std::basic_string<_Tp, _Traits, _Alloc>> >::type { }; } // namespace __detail::__variant #endif // C++17 #endif // C++14 _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif // C++11 #endif /* _BASIC_STRING_H */