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___ALGORITHM_IN_OUT_RESULT_H
11 #define _LIBCPP___ALGORITHM_IN_OUT_RESULT_H
12 
13 #include <__concepts/convertible_to.h>
14 #include <__config>
15 #include <__utility/move.h>
16 
17 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
18 #  pragma GCC system_header
19 #endif
20 
21 _LIBCPP_BEGIN_NAMESPACE_STD
22 
23 #if _LIBCPP_STD_VER > 17
24 
25 namespace ranges {
26 
27 template<class _InIter1, class _OutIter1>
28 struct in_out_result {
29   _LIBCPP_NO_UNIQUE_ADDRESS _InIter1 in;
30   _LIBCPP_NO_UNIQUE_ADDRESS _OutIter1 out;
31 
32   template <class _InIter2, class _OutIter2>
33     requires convertible_to<const _InIter1&, _InIter2> && convertible_to<const _OutIter1&, _OutIter2>
34   _LIBCPP_HIDE_FROM_ABI
35   constexpr operator in_out_result<_InIter2, _OutIter2>() const & {
36     return {in, out};
37   }
38 
39   template <class _InIter2, class _OutIter2>
40     requires convertible_to<_InIter1, _InIter2> && convertible_to<_OutIter1, _OutIter2>
41   _LIBCPP_HIDE_FROM_ABI
42   constexpr operator in_out_result<_InIter2, _OutIter2>() && {
43     return {std::move(in), std::move(out)};
44   }
45 };
46 
47 } // namespace ranges
48 
49 #endif // _LIBCPP_STD_VER > 17
50 
51 _LIBCPP_END_NAMESPACE_STD
52 
53 #endif // _LIBCPP___ALGORITHM_IN_OUT_RESULT_H
54