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_PUSH_MACROS
22 #include <__undef_macros>
23 
24 _LIBCPP_BEGIN_NAMESPACE_STD
25 
26 #if _LIBCPP_STD_VER >= 20
27 
28 namespace ranges {
29 
30 template<class _InIter1, class _OutIter1>
31 struct in_out_result {
32   _LIBCPP_NO_UNIQUE_ADDRESS _InIter1 in;
33   _LIBCPP_NO_UNIQUE_ADDRESS _OutIter1 out;
34 
35   template <class _InIter2, class _OutIter2>
36     requires convertible_to<const _InIter1&, _InIter2> && convertible_to<const _OutIter1&, _OutIter2>
37   _LIBCPP_HIDE_FROM_ABI
38   constexpr operator in_out_result<_InIter2, _OutIter2>() const & {
39     return {in, out};
40   }
41 
42   template <class _InIter2, class _OutIter2>
43     requires convertible_to<_InIter1, _InIter2> && convertible_to<_OutIter1, _OutIter2>
44   _LIBCPP_HIDE_FROM_ABI
45   constexpr operator in_out_result<_InIter2, _OutIter2>() && {
46     return {std::move(in), std::move(out)};
47   }
48 };
49 
50 } // namespace ranges
51 
52 #endif // _LIBCPP_STD_VER >= 20
53 
54 _LIBCPP_END_NAMESPACE_STD
55 
56 _LIBCPP_POP_MACROS
57 
58 #endif // _LIBCPP___ALGORITHM_IN_OUT_RESULT_H
59