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ba87515fea
Currently, the library-internal feature test macros are only defined if the feature is not available, and always have the prefix `_LIBCPP_HAS_NO_`. This patch changes that, so that they are always defined and have the prefix `_LIBCPP_HAS_` instead. This changes the canonical use of these macros to `#if _LIBCPP_HAS_FEATURE`, which means that using an undefined macro (e.g. due to a missing include) is diagnosed now. While this is rather unlikely currently, a similar change in `<__configuration/availability.h>` caught a few bugs. This also improves readability, since it removes the double-negation of `#ifndef _LIBCPP_HAS_NO_FEATURE`. The current patch only touches the macros defined in `<__config>`. If people are happy with this approach, I'll make a follow-up PR to also change the macros defined in `<__config_site>`.
62 lines
1.8 KiB
C++
62 lines
1.8 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 _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_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 _LIBCPP_HAS_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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