forked from OSchip/llvm-project
128 lines
2.9 KiB
C++
128 lines
2.9 KiB
C++
// -*- 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_BASE_H
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#define _LIBCPP___MEMORY_BASE_H
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#include <__config>
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#include <__debug>
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#include <type_traits>
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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_PUSH_MACROS
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#include <__undef_macros>
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_LIBCPP_BEGIN_NAMESPACE_STD
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// addressof
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#ifndef _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
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template <class _Tp>
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inline _LIBCPP_CONSTEXPR_AFTER_CXX14
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_LIBCPP_NO_CFI _LIBCPP_INLINE_VISIBILITY
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_Tp*
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addressof(_Tp& __x) _NOEXCEPT
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{
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return __builtin_addressof(__x);
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}
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#else
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template <class _Tp>
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inline _LIBCPP_NO_CFI _LIBCPP_INLINE_VISIBILITY
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_Tp*
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addressof(_Tp& __x) _NOEXCEPT
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{
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return reinterpret_cast<_Tp *>(
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const_cast<char *>(&reinterpret_cast<const volatile char &>(__x)));
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}
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#endif // _LIBCPP_HAS_NO_BUILTIN_ADDRESSOF
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#if defined(_LIBCPP_HAS_OBJC_ARC) && !defined(_LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF)
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// Objective-C++ Automatic Reference Counting uses qualified pointers
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// that require special addressof() signatures. When
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// _LIBCPP_PREDEFINED_OBJC_ARC_ADDRESSOF is defined, the compiler
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// itself is providing these definitions. Otherwise, we provide them.
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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__strong _Tp*
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addressof(__strong _Tp& __x) _NOEXCEPT
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{
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return &__x;
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}
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#ifdef _LIBCPP_HAS_OBJC_ARC_WEAK
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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__weak _Tp*
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addressof(__weak _Tp& __x) _NOEXCEPT
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{
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return &__x;
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}
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#endif
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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__autoreleasing _Tp*
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addressof(__autoreleasing _Tp& __x) _NOEXCEPT
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{
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return &__x;
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}
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY
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__unsafe_unretained _Tp*
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addressof(__unsafe_unretained _Tp& __x) _NOEXCEPT
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{
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return &__x;
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}
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#endif
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#if !defined(_LIBCPP_CXX03_LANG)
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template <class _Tp> _Tp* addressof(const _Tp&&) noexcept = delete;
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#endif
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// construct_at
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#if _LIBCPP_STD_VER > 17
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template<class _Tp, class ..._Args, class = decltype(
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::new (_VSTD::declval<void*>()) _Tp(_VSTD::declval<_Args>()...)
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)>
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_LIBCPP_INLINE_VISIBILITY
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constexpr _Tp* construct_at(_Tp* __location, _Args&& ...__args) {
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_LIBCPP_ASSERT(__location, "null pointer given to construct_at");
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return ::new ((void*)__location) _Tp(_VSTD::forward<_Args>(__args)...);
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}
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#endif
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// destroy_at
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#if _LIBCPP_STD_VER > 14
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template <class _Tp>
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inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17
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void destroy_at(_Tp* __loc) {
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_LIBCPP_ASSERT(__loc, "null pointer given to destroy_at");
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__loc->~_Tp();
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}
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#endif
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_LIBCPP_END_NAMESPACE_STD
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_LIBCPP_POP_MACROS
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#endif // _LIBCPP___MEMORY_BASE_H
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