// Safe iterator implementation -*- C++ -*- // Copyright (C) 2003-2020 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 debug/safe_iterator.h * This file is a GNU debug extension to the Standard C++ Library. */ #ifndef _GLIBCXX_DEBUG_SAFE_ITERATOR_H #define _GLIBCXX_DEBUG_SAFE_ITERATOR_H 1 #include <debug/assertions.h> #include <debug/macros.h> #include <debug/functions.h> #include <debug/safe_base.h> #include <bits/stl_pair.h> #include <ext/type_traits.h> #if __cplusplus > 201703L # include <compare> #endif #define _GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs, _BadMsgId, _DiffMsgId) \ _GLIBCXX_DEBUG_VERIFY(!_Lhs._M_singular() && !_Rhs._M_singular(), \ _M_message(_BadMsgId) \ ._M_iterator(_Lhs, #_Lhs) \ ._M_iterator(_Rhs, #_Rhs)); \ _GLIBCXX_DEBUG_VERIFY(_Lhs._M_can_compare(_Rhs), \ _M_message(_DiffMsgId) \ ._M_iterator(_Lhs, #_Lhs) \ ._M_iterator(_Rhs, #_Rhs)) #define _GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS(_Lhs, _Rhs) \ _GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs, __msg_iter_compare_bad, \ __msg_compare_different) #define _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(_Lhs, _Rhs) \ _GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs, __msg_iter_order_bad, \ __msg_order_different) #define _GLIBCXX_DEBUG_VERIFY_DIST_OPERANDS(_Lhs, _Rhs) \ _GLIBCXX_DEBUG_VERIFY_OPERANDS(_Lhs, _Rhs, __msg_distance_bad, \ __msg_distance_different) namespace __gnu_debug { /** Helper struct to deal with sequence offering a before_begin * iterator. **/ template<typename _Sequence> struct _BeforeBeginHelper { template<typename _Iterator, typename _Category> static bool _S_Is(const _Safe_iterator<_Iterator, _Sequence, _Category>&) { return false; } template<typename _Iterator, typename _Category> static bool _S_Is_Beginnest(const _Safe_iterator<_Iterator, _Sequence, _Category>& __it) { return __it.base() == __it._M_get_sequence()->_M_base().begin(); } }; /** Sequence traits giving the size of a container if possible. */ template<typename _Sequence> struct _Sequence_traits { typedef _Distance_traits<typename _Sequence::iterator> _DistTraits; static typename _DistTraits::__type _S_size(const _Sequence& __seq) { return std::make_pair(__seq.size(), __dp_exact); } }; /** \brief Safe iterator wrapper. * * The class template %_Safe_iterator is a wrapper around an * iterator that tracks the iterator's movement among sequences and * checks that operations performed on the "safe" iterator are * legal. In additional to the basic iterator operations (which are * validated, and then passed to the underlying iterator), * %_Safe_iterator has member functions for iterator invalidation, * attaching/detaching the iterator from sequences, and querying * the iterator's state. * * Note that _Iterator must be the first base class so that it gets * initialized before the iterator is being attached to the container's list * of iterators and it is being detached before _Iterator get * destroyed. Otherwise it would result in a data race. */ template<typename _Iterator, typename _Sequence, typename _Category = typename std::iterator_traits<_Iterator>::iterator_category> class _Safe_iterator : private _Iterator, public _Safe_iterator_base { typedef _Iterator _Iter_base; typedef _Safe_iterator_base _Safe_base; typedef std::iterator_traits<_Iterator> _Traits; protected: typedef std::__are_same<typename _Sequence::_Base::const_iterator, _Iterator> _IsConstant; typedef typename __gnu_cxx::__conditional_type< _IsConstant::__value, typename _Sequence::_Base::iterator, typename _Sequence::_Base::const_iterator>::__type _OtherIterator; struct _Attach_single { }; _Safe_iterator(_Iterator __i, _Safe_sequence_base* __seq, _Attach_single) _GLIBCXX_NOEXCEPT : _Iter_base(__i) { _M_attach_single(__seq); } public: typedef _Iterator iterator_type; typedef typename _Traits::iterator_category iterator_category; typedef typename _Traits::value_type value_type; typedef typename _Traits::difference_type difference_type; typedef typename _Traits::reference reference; typedef typename _Traits::pointer pointer; #if __cplusplus > 201703L && __cpp_lib_concepts using iterator_concept = std::__detail::__iter_concept<_Iterator>; #endif /// @post the iterator is singular and unattached _Safe_iterator() _GLIBCXX_NOEXCEPT : _Iter_base() { } /** * @brief Safe iterator construction from an unsafe iterator and * its sequence. * * @pre @p seq is not NULL * @post this is not singular */ _Safe_iterator(_Iterator __i, const _Safe_sequence_base* __seq) _GLIBCXX_NOEXCEPT : _Iter_base(__i), _Safe_base(__seq, _S_constant()) { _GLIBCXX_DEBUG_VERIFY(!this->_M_singular(), _M_message(__msg_init_singular) ._M_iterator(*this, "this")); } /** * @brief Copy construction. */ _Safe_iterator(const _Safe_iterator& __x) _GLIBCXX_NOEXCEPT : _Iter_base(__x.base()) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // DR 408. Is vector<reverse_iterator<char*> > forbidden? _GLIBCXX_DEBUG_VERIFY(!__x._M_singular() || __x.base() == _Iterator(), _M_message(__msg_init_copy_singular) ._M_iterator(*this, "this") ._M_iterator(__x, "other")); _M_attach(__x._M_sequence); } #if __cplusplus >= 201103L /** * @brief Move construction. * @post __x is singular and unattached */ _Safe_iterator(_Safe_iterator&& __x) noexcept : _Iter_base() { _GLIBCXX_DEBUG_VERIFY(!__x._M_singular() || __x.base() == _Iterator(), _M_message(__msg_init_copy_singular) ._M_iterator(*this, "this") ._M_iterator(__x, "other")); _Safe_sequence_base* __seq = __x._M_sequence; __x._M_detach(); std::swap(base(), __x.base()); _M_attach(__seq); } #endif /** * @brief Converting constructor from a mutable iterator to a * constant iterator. */ template<typename _MutableIterator> _Safe_iterator( const _Safe_iterator<_MutableIterator, _Sequence, typename __gnu_cxx::__enable_if<_IsConstant::__value && std::__are_same<_MutableIterator, _OtherIterator>::__value, _Category>::__type>& __x) _GLIBCXX_NOEXCEPT : _Iter_base(__x.base()) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // DR 408. Is vector<reverse_iterator<char*> > forbidden? _GLIBCXX_DEBUG_VERIFY(!__x._M_singular() || __x.base() == _MutableIterator(), _M_message(__msg_init_const_singular) ._M_iterator(*this, "this") ._M_iterator(__x, "other")); _M_attach(__x._M_sequence); } /** * @brief Copy assignment. */ _Safe_iterator& operator=(const _Safe_iterator& __x) _GLIBCXX_NOEXCEPT { // _GLIBCXX_RESOLVE_LIB_DEFECTS // DR 408. Is vector<reverse_iterator<char*> > forbidden? _GLIBCXX_DEBUG_VERIFY(!__x._M_singular() || __x.base() == _Iterator(), _M_message(__msg_copy_singular) ._M_iterator(*this, "this") ._M_iterator(__x, "other")); if (this->_M_sequence && this->_M_sequence == __x._M_sequence) { __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); base() = __x.base(); _M_version = __x._M_sequence->_M_version; } else { _M_detach(); base() = __x.base(); _M_attach(__x._M_sequence); } return *this; } #if __cplusplus >= 201103L /** * @brief Move assignment. * @post __x is singular and unattached */ _Safe_iterator& operator=(_Safe_iterator&& __x) noexcept { _GLIBCXX_DEBUG_VERIFY(this != &__x, _M_message(__msg_self_move_assign) ._M_iterator(*this, "this")); _GLIBCXX_DEBUG_VERIFY(!__x._M_singular() || __x.base() == _Iterator(), _M_message(__msg_copy_singular) ._M_iterator(*this, "this") ._M_iterator(__x, "other")); if (this->_M_sequence && this->_M_sequence == __x._M_sequence) { __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); base() = __x.base(); _M_version = __x._M_sequence->_M_version; } else { _M_detach(); base() = __x.base(); _M_attach(__x._M_sequence); } __x._M_detach(); __x.base() = _Iterator(); return *this; } #endif /** * @brief Iterator dereference. * @pre iterator is dereferenceable */ reference operator*() const _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(), _M_message(__msg_bad_deref) ._M_iterator(*this, "this")); return *base(); } /** * @brief Iterator dereference. * @pre iterator is dereferenceable */ pointer operator->() const _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_dereferenceable(), _M_message(__msg_bad_deref) ._M_iterator(*this, "this")); return base().operator->(); } // ------ Input iterator requirements ------ /** * @brief Iterator preincrement * @pre iterator is incrementable */ _Safe_iterator& operator++() _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(), _M_message(__msg_bad_inc) ._M_iterator(*this, "this")); __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); ++base(); return *this; } /** * @brief Iterator postincrement * @pre iterator is incrementable */ _Safe_iterator operator++(int) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(), _M_message(__msg_bad_inc) ._M_iterator(*this, "this")); __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); return _Safe_iterator(base()++, this->_M_sequence, _Attach_single()); } // ------ Utilities ------ /// Determine if this is a constant iterator. static _GLIBCXX_CONSTEXPR bool _S_constant() { return _IsConstant::__value; } /** * @brief Return the underlying iterator */ _Iterator& base() _GLIBCXX_NOEXCEPT { return *this; } const _Iterator& base() const _GLIBCXX_NOEXCEPT { return *this; } /** * @brief Conversion to underlying non-debug iterator to allow * better interaction with non-debug containers. */ operator _Iterator() const _GLIBCXX_NOEXCEPT { return *this; } /** Attach iterator to the given sequence. */ void _M_attach(_Safe_sequence_base* __seq) { _Safe_base::_M_attach(__seq, _S_constant()); } /** Likewise, but not thread-safe. */ void _M_attach_single(_Safe_sequence_base* __seq) { _Safe_base::_M_attach_single(__seq, _S_constant()); } /// Is the iterator dereferenceable? bool _M_dereferenceable() const { return !this->_M_singular() && !_M_is_end() && !_M_is_before_begin(); } /// Is the iterator before a dereferenceable one? bool _M_before_dereferenceable() const { if (this->_M_incrementable()) { _Iterator __base = base(); return ++__base != _M_get_sequence()->_M_base().end(); } return false; } /// Is the iterator incrementable? bool _M_incrementable() const { return !this->_M_singular() && !_M_is_end(); } // Can we advance the iterator @p __n steps (@p __n may be negative) bool _M_can_advance(difference_type __n, bool __strict = false) const; // Is the iterator range [*this, __rhs) valid? bool _M_valid_range(const _Safe_iterator& __rhs, std::pair<difference_type, _Distance_precision>& __dist, bool __check_dereferenceable = true) const; // The sequence this iterator references. typename __gnu_cxx::__conditional_type< _IsConstant::__value, const _Sequence*, _Sequence*>::__type _M_get_sequence() const { return static_cast<_Sequence*>(_M_sequence); } // Get distance to __rhs. typename _Distance_traits<_Iterator>::__type _M_get_distance_to(const _Safe_iterator& __rhs) const; // Get distance from sequence begin up to *this. typename _Distance_traits<_Iterator>::__type _M_get_distance_from_begin() const; // Get distance from *this to sequence end. typename _Distance_traits<_Iterator>::__type _M_get_distance_to_end() const; /// Is this iterator equal to the sequence's begin() iterator? bool _M_is_begin() const { return base() == _M_get_sequence()->_M_base().begin(); } /// Is this iterator equal to the sequence's end() iterator? bool _M_is_end() const { return base() == _M_get_sequence()->_M_base().end(); } /// Is this iterator equal to the sequence's before_begin() iterator if /// any? bool _M_is_before_begin() const { return _BeforeBeginHelper<_Sequence>::_S_Is(*this); } /// Is this iterator equal to the sequence's before_begin() iterator if /// any or begin() otherwise? bool _M_is_beginnest() const { return _BeforeBeginHelper<_Sequence>::_S_Is_Beginnest(*this); } // ------ Operators ------ typedef _Safe_iterator<_Iterator, _Sequence, iterator_category> _Self; friend bool operator==(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS(__lhs, __rhs); return __lhs.base() == __rhs.base(); } template<typename _IteR> friend bool operator==(const _Self& __lhs, const _Safe_iterator<_IteR, _Sequence, iterator_category>& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS(__lhs, __rhs); return __lhs.base() == __rhs.base(); } #if ! __cpp_lib_three_way_comparison friend bool operator!=(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS(__lhs, __rhs); return __lhs.base() != __rhs.base(); } template<typename _IteR> friend bool operator!=(const _Self& __lhs, const _Safe_iterator<_IteR, _Sequence, iterator_category>& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS(__lhs, __rhs); return __lhs.base() != __rhs.base(); } #endif // three-way comparison }; template<typename _Iterator, typename _Sequence> class _Safe_iterator<_Iterator, _Sequence, std::bidirectional_iterator_tag> : public _Safe_iterator<_Iterator, _Sequence, std::forward_iterator_tag> { typedef _Safe_iterator<_Iterator, _Sequence, std::forward_iterator_tag> _Safe_base; protected: typedef typename _Safe_base::_OtherIterator _OtherIterator; typedef typename _Safe_base::_Attach_single _Attach_single; _Safe_iterator(_Iterator __i, _Safe_sequence_base* __seq, _Attach_single) _GLIBCXX_NOEXCEPT : _Safe_base(__i, __seq, _Attach_single()) { } public: /// @post the iterator is singular and unattached _Safe_iterator() _GLIBCXX_NOEXCEPT { } /** * @brief Safe iterator construction from an unsafe iterator and * its sequence. * * @pre @p seq is not NULL * @post this is not singular */ _Safe_iterator(_Iterator __i, const _Safe_sequence_base* __seq) _GLIBCXX_NOEXCEPT : _Safe_base(__i, __seq) { } /** * @brief Copy construction. */ _Safe_iterator(const _Safe_iterator& __x) _GLIBCXX_NOEXCEPT : _Safe_base(__x) { } #if __cplusplus >= 201103L /** @brief Move construction. */ _Safe_iterator(_Safe_iterator&&) = default; #endif /** * @brief Converting constructor from a mutable iterator to a * constant iterator. */ template<typename _MutableIterator> _Safe_iterator( const _Safe_iterator<_MutableIterator, _Sequence, typename __gnu_cxx::__enable_if<_Safe_base::_IsConstant::__value && std::__are_same<_MutableIterator, _OtherIterator>::__value, std::bidirectional_iterator_tag>::__type>& __x) _GLIBCXX_NOEXCEPT : _Safe_base(__x) { } #if __cplusplus >= 201103L /** @brief Copy assignment. */ _Safe_iterator& operator=(const _Safe_iterator&) = default; /** @brief Move assignment. */ _Safe_iterator& operator=(_Safe_iterator&&) = default; #else /** @brief Copy assignment. */ _Safe_iterator& operator=(const _Safe_iterator& __x) { _Safe_base::operator=(__x); return *this; } #endif // ------ Input iterator requirements ------ /** * @brief Iterator preincrement * @pre iterator is incrementable */ _Safe_iterator& operator++() _GLIBCXX_NOEXCEPT { _Safe_base::operator++(); return *this; } /** * @brief Iterator postincrement * @pre iterator is incrementable */ _Safe_iterator operator++(int) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(), _M_message(__msg_bad_inc) ._M_iterator(*this, "this")); __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); return _Safe_iterator(this->base()++, this->_M_sequence, _Attach_single()); } // ------ Bidirectional iterator requirements ------ /** * @brief Iterator predecrement * @pre iterator is decrementable */ _Safe_iterator& operator--() _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(), _M_message(__msg_bad_dec) ._M_iterator(*this, "this")); __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); --this->base(); return *this; } /** * @brief Iterator postdecrement * @pre iterator is decrementable */ _Safe_iterator operator--(int) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(), _M_message(__msg_bad_dec) ._M_iterator(*this, "this")); __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); return _Safe_iterator(this->base()--, this->_M_sequence, _Attach_single()); } // ------ Utilities ------ // Is the iterator decrementable? bool _M_decrementable() const { return !this->_M_singular() && !this->_M_is_begin(); } }; template<typename _Iterator, typename _Sequence> class _Safe_iterator<_Iterator, _Sequence, std::random_access_iterator_tag> : public _Safe_iterator<_Iterator, _Sequence, std::bidirectional_iterator_tag> { typedef _Safe_iterator<_Iterator, _Sequence, std::bidirectional_iterator_tag> _Safe_base; typedef typename _Safe_base::_OtherIterator _OtherIterator; typedef typename _Safe_base::_Self _Self; typedef _Safe_iterator<_OtherIterator, _Sequence, std::random_access_iterator_tag> _OtherSelf; typedef typename _Safe_base::_Attach_single _Attach_single; _Safe_iterator(_Iterator __i, _Safe_sequence_base* __seq, _Attach_single) _GLIBCXX_NOEXCEPT : _Safe_base(__i, __seq, _Attach_single()) { } public: typedef typename _Safe_base::difference_type difference_type; typedef typename _Safe_base::reference reference; /// @post the iterator is singular and unattached _Safe_iterator() _GLIBCXX_NOEXCEPT { } /** * @brief Safe iterator construction from an unsafe iterator and * its sequence. * * @pre @p seq is not NULL * @post this is not singular */ _Safe_iterator(_Iterator __i, const _Safe_sequence_base* __seq) _GLIBCXX_NOEXCEPT : _Safe_base(__i, __seq) { } /** * @brief Copy construction. */ _Safe_iterator(const _Safe_iterator& __x) _GLIBCXX_NOEXCEPT : _Safe_base(__x) { } #if __cplusplus >= 201103L /** @brief Move construction. */ _Safe_iterator(_Safe_iterator&&) = default; #endif /** * @brief Converting constructor from a mutable iterator to a * constant iterator. */ template<typename _MutableIterator> _Safe_iterator( const _Safe_iterator<_MutableIterator, _Sequence, typename __gnu_cxx::__enable_if<_Safe_base::_IsConstant::__value && std::__are_same<_MutableIterator, _OtherIterator>::__value, std::random_access_iterator_tag>::__type>& __x) _GLIBCXX_NOEXCEPT : _Safe_base(__x) { } #if __cplusplus >= 201103L /** @brief Copy assignment. */ _Safe_iterator& operator=(const _Safe_iterator&) = default; /** @brief Move assignment. */ _Safe_iterator& operator=(_Safe_iterator&&) = default; #else /** @brief Copy assignment. */ _Safe_iterator& operator=(const _Safe_iterator& __x) { _Safe_base::operator=(__x); return *this; } #endif // Is the iterator range [*this, __rhs) valid? bool _M_valid_range(const _Safe_iterator& __rhs, std::pair<difference_type, _Distance_precision>& __dist) const; // ------ Input iterator requirements ------ /** * @brief Iterator preincrement * @pre iterator is incrementable */ _Safe_iterator& operator++() _GLIBCXX_NOEXCEPT { _Safe_base::operator++(); return *this; } /** * @brief Iterator postincrement * @pre iterator is incrementable */ _Safe_iterator operator++(int) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_incrementable(), _M_message(__msg_bad_inc) ._M_iterator(*this, "this")); __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); return _Safe_iterator(this->base()++, this->_M_sequence, _Attach_single()); } // ------ Bidirectional iterator requirements ------ /** * @brief Iterator predecrement * @pre iterator is decrementable */ _Safe_iterator& operator--() _GLIBCXX_NOEXCEPT { _Safe_base::operator--(); return *this; } /** * @brief Iterator postdecrement * @pre iterator is decrementable */ _Safe_iterator operator--(int) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_decrementable(), _M_message(__msg_bad_dec) ._M_iterator(*this, "this")); __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); return _Safe_iterator(this->base()--, this->_M_sequence, _Attach_single()); } // ------ Random access iterator requirements ------ reference operator[](difference_type __n) const _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(__n) && this->_M_can_advance(__n + 1), _M_message(__msg_iter_subscript_oob) ._M_iterator(*this)._M_integer(__n)); return this->base()[__n]; } _Safe_iterator& operator+=(difference_type __n) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(__n), _M_message(__msg_advance_oob) ._M_iterator(*this)._M_integer(__n)); __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); this->base() += __n; return *this; } _Safe_iterator& operator-=(difference_type __n) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(this->_M_can_advance(-__n), _M_message(__msg_retreat_oob) ._M_iterator(*this)._M_integer(__n)); __gnu_cxx::__scoped_lock __l(this->_M_get_mutex()); this->base() -= __n; return *this; } #if __cpp_lib_three_way_comparison friend auto operator<=>(const _Self& __lhs, const _Self& __rhs) noexcept { _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs); return __lhs.base() <=> __rhs.base(); } friend auto operator<=>(const _Self& __lhs, const _OtherSelf& __rhs) noexcept { _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs); return __lhs.base() <=> __rhs.base(); } #else friend bool operator<(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs); return __lhs.base() < __rhs.base(); } friend bool operator<(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs); return __lhs.base() < __rhs.base(); } friend bool operator<=(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs); return __lhs.base() <= __rhs.base(); } friend bool operator<=(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs); return __lhs.base() <= __rhs.base(); } friend bool operator>(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs); return __lhs.base() > __rhs.base(); } friend bool operator>(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs); return __lhs.base() > __rhs.base(); } friend bool operator>=(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs); return __lhs.base() >= __rhs.base(); } friend bool operator>=(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS(__lhs, __rhs); return __lhs.base() >= __rhs.base(); } #endif // three-way comparison // _GLIBCXX_RESOLVE_LIB_DEFECTS // According to the resolution of DR179 not only the various comparison // operators but also operator- must accept mixed iterator/const_iterator // parameters. friend difference_type operator-(const _Self& __lhs, const _OtherSelf& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_DIST_OPERANDS(__lhs, __rhs); return __lhs.base() - __rhs.base(); } friend difference_type operator-(const _Self& __lhs, const _Self& __rhs) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY_DIST_OPERANDS(__lhs, __rhs); return __lhs.base() - __rhs.base(); } friend _Self operator+(const _Self& __x, difference_type __n) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(__x._M_can_advance(__n), _M_message(__msg_advance_oob) ._M_iterator(__x)._M_integer(__n)); return _Safe_iterator(__x.base() + __n, __x._M_sequence); } friend _Self operator+(difference_type __n, const _Self& __x) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(__x._M_can_advance(__n), _M_message(__msg_advance_oob) ._M_iterator(__x)._M_integer(__n)); return _Safe_iterator(__n + __x.base(), __x._M_sequence); } friend _Self operator-(const _Self& __x, difference_type __n) _GLIBCXX_NOEXCEPT { _GLIBCXX_DEBUG_VERIFY(__x._M_can_advance(-__n), _M_message(__msg_retreat_oob) ._M_iterator(__x)._M_integer(__n)); return _Safe_iterator(__x.base() - __n, __x._M_sequence); } }; /** Safe iterators know how to check if they form a valid range. */ template<typename _Iterator, typename _Sequence, typename _Category> inline bool __valid_range(const _Safe_iterator<_Iterator, _Sequence, _Category>& __first, const _Safe_iterator<_Iterator, _Sequence, _Category>& __last, typename _Distance_traits<_Iterator>::__type& __dist) { return __first._M_valid_range(__last, __dist); } template<typename _Iterator, typename _Sequence, typename _Category> inline bool __valid_range(const _Safe_iterator<_Iterator, _Sequence, _Category>& __first, const _Safe_iterator<_Iterator, _Sequence, _Category>& __last) { typename _Distance_traits<_Iterator>::__type __dist; return __first._M_valid_range(__last, __dist); } template<typename _Iterator, typename _Sequence, typename _Category, typename _Size> inline bool __can_advance(const _Safe_iterator<_Iterator, _Sequence, _Category>& __it, _Size __n) { return __it._M_can_advance(__n); } template<typename _Iterator, typename _Sequence> _Iterator __base(const _Safe_iterator<_Iterator, _Sequence, std::random_access_iterator_tag>& __it) { return __it.base(); } #if __cplusplus < 201103L template<typename _Iterator, typename _Sequence> struct _Unsafe_type<_Safe_iterator<_Iterator, _Sequence> > { typedef _Iterator _Type; }; #endif template<typename _Iterator, typename _Sequence> inline _Iterator __unsafe(const _Safe_iterator<_Iterator, _Sequence>& __it) { return __it.base(); } } // namespace __gnu_debug #undef _GLIBCXX_DEBUG_VERIFY_DIST_OPERANDS #undef _GLIBCXX_DEBUG_VERIFY_REL_OPERANDS #undef _GLIBCXX_DEBUG_VERIFY_EQ_OPERANDS #undef _GLIBCXX_DEBUG_VERIFY_OPERANDS #include <debug/safe_iterator.tcc> #endif