v1/__memory/temporary_buffer.h

0001 // -*- C++ -*-
0002 //===----------------------------------------------------------------------===//
0003 //
0004 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
0005 // See https://llvm.org/LICENSE.txt for license information.
0006 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
0007 //
0008 //===----------------------------------------------------------------------===//
0009
0010 #ifndef _LIBCPP___MEMORY_TEMPORARY_BUFFER_H
0011 #define _LIBCPP___MEMORY_TEMPORARY_BUFFER_H
0012
0013 #include <__config>
0014 #include <__cstddef/ptrdiff_t.h>
0015 #include <__memory/unique_temporary_buffer.h>
0016 #include <__utility/pair.h>
0017
0018 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0019 #  pragma GCC system_header
0020 #endif
0021
0022 #if _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TEMPORARY_BUFFER)
0023
0024 _LIBCPP_BEGIN_NAMESPACE_STD
0025
0026 template <class _Tp>
0027 [[__nodiscard__]] _LIBCPP_HIDE_FROM_ABI _LIBCPP_NO_CFI _LIBCPP_DEPRECATED_IN_CXX17 pair<_Tp*, ptrdiff_t>
0028 get_temporary_buffer(ptrdiff_t __n) _NOEXCEPT {
0029   __unique_temporary_buffer<_Tp> __unique_buf = std::__allocate_unique_temporary_buffer<_Tp>(__n);
0030   pair<_Tp*, ptrdiff_t> __result(__unique_buf.get(), __unique_buf.get_deleter().__count_);
0031   __unique_buf.release();
0032   return __result;
0033 }
0034
0035 template <class _Tp>
0036 inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_DEPRECATED_IN_CXX17 void return_temporary_buffer(_Tp* __p) _NOEXCEPT {
0037   __unique_temporary_buffer<_Tp> __unique_buf(__p);
0038   (void)__unique_buf;
0039 }
0040
0041 _LIBCPP_END_NAMESPACE_STD
0042
0043 #endif // _LIBCPP_STD_VER <= 17 || defined(_LIBCPP_ENABLE_CXX20_REMOVED_TEMPORARY_BUFFER)
0044
0045 #endif // _LIBCPP___MEMORY_TEMPORARY_BUFFER_H