v1/__algorithm/in_out_result.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___ALGORITHM_IN_OUT_RESULT_H
0011 #define _LIBCPP___ALGORITHM_IN_OUT_RESULT_H
0012
0013 #include <__concepts/convertible_to.h>
0014 #include <__config>
0015 #include <__utility/move.h>
0016
0017 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
0018 #  pragma GCC system_header
0019 #endif
0020
0021 _LIBCPP_PUSH_MACROS
0022 #include <__undef_macros>
0023
0024 _LIBCPP_BEGIN_NAMESPACE_STD
0025
0026 #if _LIBCPP_STD_VER >= 20
0027
0028 namespace ranges {
0029
0030 template <class _InIter1, class _OutIter1>
0031 struct in_out_result {
0032   _LIBCPP_NO_UNIQUE_ADDRESS _InIter1 in;
0033   _LIBCPP_NO_UNIQUE_ADDRESS _OutIter1 out;
0034
0035   template <class _InIter2, class _OutIter2>
0036     requires convertible_to<const _InIter1&, _InIter2> && convertible_to<const _OutIter1&, _OutIter2>
0037   _LIBCPP_HIDE_FROM_ABI constexpr operator in_out_result<_InIter2, _OutIter2>() const& {
0038     return {in, out};
0039   }
0040
0041   template <class _InIter2, class _OutIter2>
0042     requires convertible_to<_InIter1, _InIter2> && convertible_to<_OutIter1, _OutIter2>
0043   _LIBCPP_HIDE_FROM_ABI constexpr operator in_out_result<_InIter2, _OutIter2>() && {
0044     return {std::move(in), std::move(out)};
0045   }
0046 };
0047
0048 } // namespace ranges
0049
0050 #endif // _LIBCPP_STD_VER >= 20
0051
0052 _LIBCPP_END_NAMESPACE_STD
0053
0054 _LIBCPP_POP_MACROS
0055
0056 #endif // _LIBCPP___ALGORITHM_IN_OUT_RESULT_H