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1//===----------------------------------------------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#ifndef _LIBCPP___CXX03___MEMORY_TEMP_VALUE_H10#define _LIBCPP___CXX03___MEMORY_TEMP_VALUE_H11 12#include <__cxx03/__config>13#include <__cxx03/__memory/addressof.h>14#include <__cxx03/__memory/allocator_traits.h>15#include <__cxx03/__type_traits/aligned_storage.h>16#include <__cxx03/__utility/forward.h>17 18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)19# pragma GCC system_header20#endif21 22_LIBCPP_BEGIN_NAMESPACE_STD23 24template <class _Tp, class _Alloc>25struct __temp_value {26 typedef allocator_traits<_Alloc> _Traits;27 28 typename aligned_storage<sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)>::type __v;29 _Alloc& __a;30 31 _LIBCPP_HIDE_FROM_ABI _Tp* __addr() { return reinterpret_cast<_Tp*>(std::addressof(__v)); }32 33 _LIBCPP_HIDE_FROM_ABI _Tp& get() { return *__addr(); }34 35 template <class... _Args>36 _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_CFI __temp_value(_Alloc& __alloc, _Args&&... __args) : __a(__alloc) {37 _Traits::construct(__a, __addr(), std::forward<_Args>(__args)...);38 }39 40 _LIBCPP_HIDE_FROM_ABI ~__temp_value() { _Traits::destroy(__a, __addr()); }41};42 43_LIBCPP_END_NAMESPACE_STD44 45#endif // _LIBCPP___CXX03___MEMORY_TEMP_VALUE_H46