windows平台的g++-9.2.0编译器

// Components for manipulating sequences of characters -*- C++ -*- // Copyright (C) 1997-2019 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