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57 lines
1.7 KiB
C
57 lines
1.7 KiB
C
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//===----------------------------------------------------------------------===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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#ifndef _LIBCPP___MEMORY_TEMP_VALUE_H
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#define _LIBCPP___MEMORY_TEMP_VALUE_H
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#include <__config>
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#include <__memory/addressof.h>
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#include <__memory/allocator_traits.h>
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#include <__type_traits/aligned_storage.h>
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#include <__utility/forward.h>
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#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
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# pragma GCC system_header
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#endif
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_LIBCPP_BEGIN_NAMESPACE_STD
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template <class _Tp, class _Alloc>
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struct __temp_value {
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typedef allocator_traits<_Alloc> _Traits;
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#ifdef _LIBCPP_CXX03_LANG
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typename aligned_storage<sizeof(_Tp), _LIBCPP_ALIGNOF(_Tp)>::type __v;
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#else
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union { _Tp __v; };
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#endif
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_Alloc &__a;
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp *__addr() {
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#ifdef _LIBCPP_CXX03_LANG
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return reinterpret_cast<_Tp*>(std::addressof(__v));
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#else
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return std::addressof(__v);
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#endif
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}
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 _Tp & get() { return *__addr(); }
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template<class... _Args>
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_CFI
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_LIBCPP_CONSTEXPR_SINCE_CXX20 __temp_value(_Alloc &__alloc, _Args&& ... __args) : __a(__alloc) {
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_Traits::construct(__a, __addr(), std::forward<_Args>(__args)...);
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}
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_LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 ~__temp_value() { _Traits::destroy(__a, __addr()); }
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};
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_TEMP_VALUE_H
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