Filename: //usr/include/c++/10///bits//locale_classes.tcc

// Locale support -*- C++ -*- // Copyright (C) 2007-2020 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/locale_classes.tcc * This is an internal header file, included by other library headers. * Do not attempt to use it directly. @headername{locale} */ // // ISO C++ 14882: 22.1 Locales // #ifndef _LOCALE_CLASSES_TCC #define _LOCALE_CLASSES_TCC 1 #pragma GCC system_header namespace std _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION template<typename _Facet> locale:: locale(const locale& __other, _Facet* __f) { _M_impl = new _Impl(*__other._M_impl, 1); __try { _M_impl->_M_install_facet(&_Facet::id, __f); } __catch(...) { _M_impl->_M_remove_reference(); __throw_exception_again; } delete [] _M_impl->_M_names[0]; _M_impl->_M_names[0] = 0; // Unnamed. } template<typename _Facet> locale locale:: combine(const locale& __other) const { _Impl* __tmp = new _Impl(*_M_impl, 1); __try { __tmp->_M_replace_facet(__other._M_impl, &_Facet::id); } __catch(...) { __tmp->_M_remove_reference(); __throw_exception_again; } return locale(__tmp); } template<typename _CharT, typename _Traits, typename _Alloc> bool locale:: operator()(const basic_string<_CharT, _Traits, _Alloc>& __s1, const basic_string<_CharT, _Traits, _Alloc>& __s2) const { typedef std::collate<_CharT> __collate_type; const __collate_type& __collate = use_facet<__collate_type>(*this); return (__collate.compare(__s1.data(), __s1.data() + __s1.length(), __s2.data(), __s2.data() + __s2.length()) < 0); } /** * @brief Test for the presence of a facet. * @ingroup locales * * has_facet tests the locale argument for the presence of the facet type * provided as the template parameter. Facets derived from the facet * parameter will also return true. * * @tparam _Facet The facet type to test the presence of. * @param __loc The locale to test. * @return true if @p __loc contains a facet of type _Facet, else false. */ template<typename _Facet> bool has_facet(const locale& __loc) throw() { const size_t __i = _Facet::id._M_id(); const locale::facet** __facets = __loc._M_impl->_M_facets; return (__i < __loc._M_impl->_M_facets_size #if __cpp_rtti && dynamic_cast<const _Facet*>(__facets[__i])); #else && static_cast<const _Facet*>(__facets[__i])); #endif } /** * @brief Return a facet. * @ingroup locales * * use_facet looks for and returns a reference to a facet of type Facet * where Facet is the template parameter. If has_facet(locale) is true, * there is a suitable facet to return. It throws std::bad_cast if the * locale doesn't contain a facet of type Facet. * * @tparam _Facet The facet type to access. * @param __loc The locale to use. * @return Reference to facet of type Facet. * @throw std::bad_cast if @p __loc doesn't contain a facet of type _Facet. */ template<typename _Facet> const _Facet& use_facet(const locale& __loc) { const size_t __i = _Facet::id._M_id(); const locale::facet** __facets = __loc._M_impl->_M_facets; if (__i >= __loc._M_impl->_M_facets_size || !__facets[__i]) __throw_bad_cast(); #if __cpp_rtti return dynamic_cast<const _Facet&>(*__facets[__i]); #else return static_cast<const _Facet&>(*__facets[__i]); #endif } // Generic version does nothing. template<typename _CharT> int collate<_CharT>::_M_compare(const _CharT*, const _CharT*) const throw () { return 0; } // Generic version does nothing. template<typename _CharT> size_t collate<_CharT>::_M_transform(_CharT*, const _CharT*, size_t) const throw () { return 0; } template<typename _CharT> int collate<_CharT>:: do_compare(const _CharT* __lo1, const _CharT* __hi1, const _CharT* __lo2, const _CharT* __hi2) const { // strcoll assumes zero-terminated strings so we make a copy // and then put a zero at the end. const string_type __one(__lo1, __hi1); const string_type __two(__lo2, __hi2); const _CharT* __p = __one.c_str(); const _CharT* __pend = __one.data() + __one.length(); const _CharT* __q = __two.c_str(); const _CharT* __qend = __two.data() + __two.length(); // strcoll stops when it sees a nul character so we break // the strings into zero-terminated substrings and pass those // to strcoll. for (;;) { const int __res = _M_compare(__p, __q); if (__res) return __res; __p += char_traits<_CharT>::length(__p); __q += char_traits<_CharT>::length(__q); if (__p == __pend && __q == __qend) return 0; else if (__p == __pend) return -1; else if (__q == __qend) return 1; __p++; __q++; } } template<typename _CharT> typename collate<_CharT>::string_type collate<_CharT>:: do_transform(const _CharT* __lo, const _CharT* __hi) const { string_type __ret; // strxfrm assumes zero-terminated strings so we make a copy const string_type __str(__lo, __hi); const _CharT* __p = __str.c_str(); const _CharT* __pend = __str.data() + __str.length(); size_t __len = (__hi - __lo) * 2; _CharT* __c = new _CharT[__len]; __try { // strxfrm stops when it sees a nul character so we break // the string into zero-terminated substrings and pass those // to strxfrm. for (;;) { // First try a buffer perhaps big enough. size_t __res = _M_transform(__c, __p, __len); // If the buffer was not large enough, try again with the // correct size. if (__res >= __len) { __len = __res + 1; delete [] __c, __c = 0; __c = new _CharT[__len]; __res = _M_transform(__c, __p, __len); } __ret.append(__c, __res); __p += char_traits<_CharT>::length(__p); if (__p == __pend) break; __p++; __ret.push_back(_CharT()); } } __catch(...) { delete [] __c; __throw_exception_again; } delete [] __c; return __ret; } template<typename _CharT> long collate<_CharT>:: do_hash(const _CharT* __lo, const _CharT* __hi) const { unsigned long __val = 0; for (; __lo < __hi; ++__lo) __val = *__lo + ((__val << 7) | (__val >> (__gnu_cxx::__numeric_traits<unsigned long>:: __digits - 7))); return static_cast<long>(__val); } // Inhibit implicit instantiations for required instantiations, // which are defined via explicit instantiations elsewhere. #if _GLIBCXX_EXTERN_TEMPLATE extern template class collate<char>; extern template class collate_byname<char>; extern template const collate<char>& use_facet<collate<char> >(const locale&); extern template bool has_facet<collate<char> >(const locale&); #ifdef _GLIBCXX_USE_WCHAR_T extern template class collate<wchar_t>; extern template class collate_byname<wchar_t>; extern template const collate<wchar_t>& use_facet<collate<wchar_t> >(const locale&); extern template bool has_facet<collate<wchar_t> >(const locale&); #endif #endif _GLIBCXX_END_NAMESPACE_VERSION } // namespace std #endif

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