libcxx/include/__algorithm/in_fun_result.h

   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