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_IN_OUT_RESULT_H
11 #define _LIBCPP___ALGORITHM_IN_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 _InIter2, class _OutIter1>
28 struct in_in_out_result {
29   _LIBCPP_NO_UNIQUE_ADDRESS _InIter1 in1;
30   _LIBCPP_NO_UNIQUE_ADDRESS _InIter2 in2;
31   _LIBCPP_NO_UNIQUE_ADDRESS _OutIter1 out;
32 
33   template <class _InIter3, class _InIter4, class _OutIter2>
34     requires convertible_to<const _InIter1&, _InIter3>
35           && convertible_to<const _InIter2&, _InIter4> && convertible_to<const _OutIter1&, _OutIter2>
36   _LIBCPP_HIDE_FROM_ABI constexpr
37   operator in_in_out_result<_InIter3, _InIter4, _OutIter2>() const& {
38     return {in1, in2, out};
39   }
40 
41   template <class _InIter3, class _InIter4, class _OutIter2>
42     requires convertible_to<_InIter1, _InIter3>
43           && convertible_to<_InIter2, _InIter4> && convertible_to<_OutIter1, _OutIter2>
44   _LIBCPP_HIDE_FROM_ABI constexpr
45   operator in_in_out_result<_InIter3, _InIter4, _OutIter2>() && {
46     return {std::move(in1), std::move(in2), std::move(out)};
47   }
48 };
49 
50 } // namespace ranges
51 
52 #endif // _LIBCPP_STD_VER > 17
53 
54 _LIBCPP_END_NAMESPACE_STD
55 
56 #endif // _LIBCPP___ALGORITHM_IN_IN_OUT_RESULT_H
57