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_RESULT_H
11 #define _LIBCPP___ALGORITHM_IN_IN_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 _InIter2>
31 struct in_in_result {
32   _LIBCPP_NO_UNIQUE_ADDRESS _InIter1 in1;
33   _LIBCPP_NO_UNIQUE_ADDRESS _InIter2 in2;
34 
35   template <class _InIter3, class _InIter4>
36     requires convertible_to<const _InIter1&, _InIter3> && convertible_to<const _InIter2&, _InIter4>
37   _LIBCPP_HIDE_FROM_ABI constexpr operator in_in_result<_InIter3, _InIter4>() const& {
38     return {in1, in2};
39   }
40 
41   template <class _InIter3, class _InIter4>
42     requires convertible_to<_InIter1, _InIter3> && convertible_to<_InIter2, _InIter4>
43   _LIBCPP_HIDE_FROM_ABI constexpr operator in_in_result<_InIter3, _InIter4>() && {
44     return {std::move(in1), std::move(in2)};
45   }
46 };
47 
48 } // namespace ranges
49 
50 #endif // _LIBCPP_STD_VER >= 20
51 
52 _LIBCPP_END_NAMESPACE_STD
53 
54 _LIBCPP_POP_MACROS
55 
56 #endif // _LIBCPP___ALGORITHM_IN_IN_RESULT_H
57