libcxx/include/__memory/temporary_buffer.h

   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
  26 template <class _Tp>
  27 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_CFI _LIBCPP_DEPRECATED_IN_CXX17 pair<_Tp*, ptrdiff_t>
  28 get_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
  35 template <class _Tp>
  36 inline _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