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_FUN_RESULT_H
11 #define _LIBCPP___ALGORITHM_IN_FUN_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 template <class _InIter1, class _Func1>
30 struct in_fun_result {
31   _LIBCPP_NO_UNIQUE_ADDRESS _InIter1 in;
32   _LIBCPP_NO_UNIQUE_ADDRESS _Func1 fun;
33 
34   template <class _InIter2, class _Func2>
35     requires convertible_to<const _InIter1&, _InIter2> && convertible_to<const _Func1&, _Func2>
36   _LIBCPP_HIDE_FROM_ABI constexpr operator in_fun_result<_InIter2, _Func2>() const& {
37     return {in, fun};
38   }
39 
40   template <class _InIter2, class _Func2>
41     requires convertible_to<_InIter1, _InIter2> && convertible_to<_Func1, _Func2>
42   _LIBCPP_HIDE_FROM_ABI constexpr operator in_fun_result<_InIter2, _Func2>() && {
43     return {std::move(in), std::move(fun)};
44   }
45 };
46 } // namespace ranges
47 
48 #endif // _LIBCPP_STD_VER >= 20
49 
50 _LIBCPP_END_NAMESPACE_STD
51 
52 _LIBCPP_POP_MACROS
53 
54 #endif // _LIBCPP___ALGORITHM_IN_FUN_RESULT_H
55