//usr/include/c++/11/ext
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algorithm — 18.8 KB
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aligned_buffer.h — 3.88 KB
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cast.h — 4.34 KB
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codecvt_specializations.h — 15.97 KB
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enc_filebuf.h — 2.19 KB
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extptr_allocator.h — 6.24 KB
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functional — 13.84 KB
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iterator — 3.94 KB
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malloc_allocator.h — 5.99 KB
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memory — 7 KB
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mt_allocator.h — 23.07 KB
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new_allocator.h — 5.91 KB
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numeric — 4.63 KB
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pod_char_traits.h — 5.43 KB
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pointer.h — 20 KB
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pool_allocator.h — 8.75 KB
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string_conversions.h — 3.51 KB
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throw_allocator.h — 25.26 KB
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type_traits.h — 5.94 KB
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typelist.h — 16.09 KB
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vstring.h — 108.03 KB
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// Aligned memory buffer -*- C++ -*- // Copyright (C) 2013-2021 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 // . /** @file ext/aligned_buffer.h * This file is a GNU extension to the Standard C++ Library. */ #ifndef _ALIGNED_BUFFER_H #define _ALIGNED_BUFFER_H 1 #pragma GCC system_header #if __cplusplus >= 201103L # include #else # include #endif namespace __gnu_cxx { // A utility type containing a POD object that can hold an object of type // _Tp initialized via placement new or allocator_traits::construct. // Intended for use as a data member subobject, use __aligned_buffer for // complete objects. template struct __aligned_membuf { // Target macro ADJUST_FIELD_ALIGN can produce different alignment for // types when used as class members. __aligned_membuf is intended // for use as a class member, so align the buffer as for a class member. // Since GCC 8 we could just use alignof(_Tp) instead, but older // versions of non-GNU compilers might still need this trick. struct _Tp2 { _Tp _M_t; }; alignas(__alignof__(_Tp2::_M_t)) unsigned char _M_storage[sizeof(_Tp)]; __aligned_membuf() = default; // Can be used to avoid value-initialization zeroing _M_storage. __aligned_membuf(std::nullptr_t) { } void* _M_addr() noexcept { return static_cast(&_M_storage); } const void* _M_addr() const noexcept { return static_cast(&_M_storage); } _Tp* _M_ptr() noexcept { return static_cast<_Tp*>(_M_addr()); } const _Tp* _M_ptr() const noexcept { return static_cast(_M_addr()); } }; #if _GLIBCXX_INLINE_VERSION template using __aligned_buffer = __aligned_membuf<_Tp>; #else // Similar to __aligned_membuf but aligned for complete objects, not members. // This type is used in , , // and , but ideally they would use __aligned_membuf // instead, as it has smaller size for some types on some targets. // This type is still used to avoid an ABI change. template struct __aligned_buffer : std::aligned_storage { typename std::aligned_storage::type _M_storage; __aligned_buffer() = default; // Can be used to avoid value-initialization __aligned_buffer(std::nullptr_t) { } void* _M_addr() noexcept { return static_cast(&_M_storage); } const void* _M_addr() const noexcept { return static_cast(&_M_storage); } _Tp* _M_ptr() noexcept { return static_cast<_Tp*>(_M_addr()); } const _Tp* _M_ptr() const noexcept { return static_cast(_M_addr()); } }; #endif } // namespace #endif /* _ALIGNED_BUFFER_H */