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#include <__type_traits/is_function.h>
14#include <__type_traits/is_void.h>
15
16#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
17#  pragma GCC system_header
18#endif
19
20_LIBCPP_BEGIN_NAMESPACE_STD
21template <class _Tp>
22[[__nodiscard__]] inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR _Tp* __launder(_Tp* __p) _NOEXCEPT {
23  static_assert(!(is_function<_Tp>::value), "can't launder functions");
24  static_assert(!is_void<_Tp>::value, "can't launder cv-void");
25  return __builtin_launder(__p);
26}
27
28#if _LIBCPP_STD_VER >= 17
29template <class _Tp>
30[[nodiscard]] inline _LIBCPP_HIDE_FROM_ABI constexpr _Tp* launder(_Tp* __p) noexcept {
31  return std::__launder(__p);
32}
33#endif
34_LIBCPP_END_NAMESPACE_STD
35
36#endif // _LIBCPP___NEW_LAUNDER_H