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_TEMPORARY_BUFFER_H
11#define _LIBCPP___MEMORY_TEMPORARY_BUFFER_H
12
13#include <__config>
14#include <__cstddef/ptrdiff_t.h>
15#include <__memory/unique_temporary_buffer.h>
16#include <__utility/pair.h>
17
18#if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
19#  pragma GCC system_header
20#endif
21
22#if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TEMPORARY_BUFFER)
23
24_LIBCPP_BEGIN_NAMESPACE_STD
25
26template <class _Tp>
27[[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_CFI _LIBCPP_DEPRECATED_IN_CXX17 pair<_Tp*, ptrdiff_t>
28get_temporary_buffer(ptrdiff_t __n) _NOEXCEPT {
29  __unique_temporary_buffer<_Tp> __unique_buf = std::__allocate_unique_temporary_buffer<_Tp>(__n);
30  pair<_Tp*, ptrdiff_t> __result(__unique_buf.get(), __unique_buf.get_deleter().__count_);
31  __unique_buf.release();
32  return __result;
33}
34
35template <class _Tp>
36inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_DEPRECATED_IN_CXX17 void return_temporary_buffer(_Tp* __p) _NOEXCEPT {
37  __unique_temporary_buffer<_Tp> __unique_buf(__p);
38  (void)__unique_buf;
39}
40
41_LIBCPP_END_NAMESPACE_STD
42
43#endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TEMPORARY_BUFFER)
44
45#endif // _LIBCPP___MEMORY_TEMPORARY_BUFFER_H