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Edit: malloc_allocator.h
// Allocator that wraps "C" malloc -*- C++ -*- // Copyright (C) 2001-2021 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 // <http://www.gnu.org/licenses/>. /** @file ext/malloc_allocator.h * This file is a GNU extension to the Standard C++ Library. */ #ifndef _MALLOC_ALLOCATOR_H #define _MALLOC_ALLOCATOR_H 1 #include <cstdlib> #include <cstddef> #include <new> #include <bits/functexcept.h> #include <bits/move.h> #if __cplusplus >= 201103L #include <type_traits> #endif namespace __gnu_cxx _GLIBCXX_VISIBILITY(default) { _GLIBCXX_BEGIN_NAMESPACE_VERSION /** * @brief An allocator that uses malloc. * @ingroup allocators * * This is precisely the allocator defined in the C++ Standard. * - all allocation calls malloc * - all deallocation calls free */ template<typename _Tp> class malloc_allocator { public: typedef _Tp value_type; typedef std::size_t size_type; typedef std::ptrdiff_t difference_type; #if __cplusplus <= 201703L typedef _Tp* pointer; typedef const _Tp* const_pointer; typedef _Tp& reference; typedef const _Tp& const_reference; template<typename _Tp1> struct rebind { typedef malloc_allocator<_Tp1> other; }; #endif #if __cplusplus >= 201103L // _GLIBCXX_RESOLVE_LIB_DEFECTS // 2103. propagate_on_container_move_assignment typedef std::true_type propagate_on_container_move_assignment; #endif _GLIBCXX20_CONSTEXPR malloc_allocator() _GLIBCXX_USE_NOEXCEPT { } _GLIBCXX20_CONSTEXPR malloc_allocator(const malloc_allocator&) _GLIBCXX_USE_NOEXCEPT { } template<typename _Tp1> _GLIBCXX20_CONSTEXPR malloc_allocator(const malloc_allocator<_Tp1>&) _GLIBCXX_USE_NOEXCEPT { } #if __cplusplus <= 201703L ~malloc_allocator() _GLIBCXX_USE_NOEXCEPT { } pointer address(reference __x) const _GLIBCXX_NOEXCEPT { return std::__addressof(__x); } const_pointer address(const_reference __x) const _GLIBCXX_NOEXCEPT { return std::__addressof(__x); } #endif // NB: __n is permitted to be 0. The C++ standard says nothing // about what the return value is when __n == 0. _GLIBCXX_NODISCARD _Tp* allocate(size_type __n, const void* = 0) { #if __cplusplus >= 201103L // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3308. std::allocator<void>().allocate(n) static_assert(sizeof(_Tp) != 0, "cannot allocate incomplete types"); #endif if (__builtin_expect(__n > this->_M_max_size(), false)) { // _GLIBCXX_RESOLVE_LIB_DEFECTS // 3190. allocator::allocate sometimes returns too little storage if (__n > (std::size_t(-1) / sizeof(_Tp))) std::__throw_bad_array_new_length(); std::__throw_bad_alloc(); } _Tp* __ret = 0; #if __cpp_aligned_new #if __cplusplus > 201402L && _GLIBCXX_HAVE_ALIGNED_ALLOC if (alignof(_Tp) > alignof(std::max_align_t)) { __ret = static_cast<_Tp*>(::aligned_alloc(alignof(_Tp), __n * sizeof(_Tp))); } #else # define _GLIBCXX_CHECK_MALLOC_RESULT #endif #endif if (!__ret) __ret = static_cast<_Tp*>(std::malloc(__n * sizeof(_Tp))); if (!__ret) std::__throw_bad_alloc(); #ifdef _GLIBCXX_CHECK_MALLOC_RESULT #undef _GLIBCXX_CHECK_MALLOC_RESULT if (reinterpret_cast<std::size_t>(__ret) % alignof(_Tp)) { // Memory returned by malloc is not suitably aligned for _Tp. deallocate(__ret, __n); std::__throw_bad_alloc(); } #endif return __ret; } // __p is not permitted to be a null pointer. void deallocate(_Tp* __p, size_type) { std::free(static_cast<void*>(__p)); } #if __cplusplus <= 201703L size_type max_size() const _GLIBCXX_USE_NOEXCEPT { return _M_max_size(); } #if __cplusplus >= 201103L template<typename _Up, typename... _Args> void construct(_Up* __p, _Args&&... __args) noexcept(std::is_nothrow_constructible<_Up, _Args...>::value) { ::new((void *)__p) _Up(std::forward<_Args>(__args)...); } template<typename _Up> void destroy(_Up* __p) noexcept(std::is_nothrow_destructible<_Up>::value) { __p->~_Up(); } #else // _GLIBCXX_RESOLVE_LIB_DEFECTS // 402. wrong new expression in [some_] allocator::construct void construct(pointer __p, const _Tp& __val) { ::new((void *)__p) value_type(__val); } void destroy(pointer __p) { __p->~_Tp(); } #endif #endif // ! C++20 template<typename _Up> friend _GLIBCXX20_CONSTEXPR bool operator==(const malloc_allocator&, const malloc_allocator<_Up>&) _GLIBCXX_NOTHROW { return true; } #if __cpp_impl_three_way_comparison < 201907L template<typename _Up> friend _GLIBCXX20_CONSTEXPR bool operator!=(const malloc_allocator&, const malloc_allocator<_Up>&) _GLIBCXX_NOTHROW { return false; } #endif private: _GLIBCXX_CONSTEXPR size_type _M_max_size() const _GLIBCXX_USE_NOEXCEPT { #if __PTRDIFF_MAX__ < __SIZE_MAX__ return std::size_t(__PTRDIFF_MAX__) / sizeof(_Tp); #else return std::size_t(-1) / sizeof(_Tp); #endif } }; _GLIBCXX_END_NAMESPACE_VERSION } // namespace #endif