040e9e02cc
Since GCC now supports `__has_feature` and `__has_extension` as well, there isn't much of a reason to define new macros to test for the features.
60 lines
1.6 KiB
C++
60 lines
1.6 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_ADDRESSOF_H
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#define _LIBCPP___MEMORY_ADDRESSOF_H
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#include <__config>
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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>
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inline _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_NO_CFI _LIBCPP_HIDE_FROM_ABI _Tp* addressof(_Tp& __x) _NOEXCEPT {
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return __builtin_addressof(__x);
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}
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#if __has_feature(objc_arc)
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// Objective-C++ Automatic Reference Counting uses qualified pointers
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// that require special addressof() signatures.
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI __strong _Tp* addressof(__strong _Tp& __x) _NOEXCEPT {
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return &__x;
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}
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# if __has_feature(objc_arc_weak)
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI __weak _Tp* addressof(__weak _Tp& __x) _NOEXCEPT {
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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_HIDE_FROM_ABI __autoreleasing _Tp* addressof(__autoreleasing _Tp& __x) _NOEXCEPT {
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return &__x;
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}
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template <class _Tp>
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inline _LIBCPP_HIDE_FROM_ABI __unsafe_unretained _Tp* addressof(__unsafe_unretained _Tp& __x) _NOEXCEPT {
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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>
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_Tp* addressof(const _Tp&&) noexcept = delete;
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#endif
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_LIBCPP_END_NAMESPACE_STD
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#endif // _LIBCPP___MEMORY_ADDRESSOF_H
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