1// -*- C++ -*-
2//===----------------------------------------------------------------------===//
3//
4// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
5// See https://llvm.org/LICENSE.txt for license information.
6// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
7//
8//===----------------------------------------------------------------------===//
9
10#ifndef _LIBCPP___MEMORY_ADDRESSOF_H
11#define _LIBCPP___MEMORY_ADDRESSOF_H
12
13#include <__config>
14
15#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
16# pragma GCC system_header
17#endif
18
19_LIBCPP_BEGIN_NAMESPACE_STD
20
21template <class _Tp>
22inline _LIBCPP_CONSTEXPR_SINCE_CXX17 _LIBCPP_NO_CFI _LIBCPP_HIDE_FROM_ABI _Tp* addressof(_Tp& __x) _NOEXCEPT {
23 return __builtin_addressof(__x);
24}
25
26#if __has_feature(objc_arc)
27// Objective-C++ Automatic Reference Counting uses qualified pointers
28// that require special addressof() signatures.
29template <class _Tp>
30inline _LIBCPP_HIDE_FROM_ABI __strong _Tp* addressof(__strong _Tp& __x) _NOEXCEPT {
31 return &__x;
32}
33
34# if __has_feature(objc_arc_weak)
35template <class _Tp>
36inline _LIBCPP_HIDE_FROM_ABI __weak _Tp* addressof(__weak _Tp& __x) _NOEXCEPT {
37 return &__x;
38}
39# endif
40
41template <class _Tp>
42inline _LIBCPP_HIDE_FROM_ABI __autoreleasing _Tp* addressof(__autoreleasing _Tp& __x) _NOEXCEPT {
43 return &__x;
44}
45
46template <class _Tp>
47inline _LIBCPP_HIDE_FROM_ABI __unsafe_unretained _Tp* addressof(__unsafe_unretained _Tp& __x) _NOEXCEPT {
48 return &__x;
49}
50#endif
51
52#if !defined(_LIBCPP_CXX03_LANG)
53template <class _Tp>
54_Tp* addressof(const _Tp&&) noexcept = delete;
55#endif
56
57_LIBCPP_END_NAMESPACE_STD
58
59#endif // _LIBCPP___MEMORY_ADDRESSOF_H
60