1//===----------------------------------------------------------------------===//
2//
3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4// See https://llvm.org/LICENSE.txt for license information.
5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6//
7//===----------------------------------------------------------------------===//
8
9#ifndef _LIBCPP___NEW_LAUNDER_H
10#define _LIBCPP___NEW_LAUNDER_H
11
12#include <__config>
13
14#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
15# pragma GCC system_header
16#endif
17
18_LIBCPP_BEGIN_NAMESPACE_STD
19template <class _Tp>
20[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT {
21 // The compiler diagnoses misuses of __builtin_launder, so we don't need to add any static_asserts
22 // to implement the Mandates.
23 return __builtin_launder(__p);
24}
25
26#if _LIBCPP_STD_VER >= 17
27template <class _Tp>
28[[nodiscard]] inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp* launder(_Tp* __p) noexcept {
29 return __builtin_launder(__p);
30}
31#endif
32_LIBCPP_END_NAMESPACE_STD
33
34#endif // _LIBCPP___NEW_LAUNDER_H
35