libcxx/include/__algorithm/in_in_out_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_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_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, class _OutIter1>
  31 struct in_in_out_result {
  32   _LIBCPP_NO_UNIQUE_ADDRESS _InIter1 in1;
  33   _LIBCPP_NO_UNIQUE_ADDRESS _InIter2 in2;
  34   _LIBCPP_NO_UNIQUE_ADDRESS _OutIter1 out;
  35
  36   template <class _InIter3, class _InIter4, class _OutIter2>
  37     requires convertible_to<const _InIter1&, _InIter3> && convertible_to<const _InIter2&, _InIter4> &&
  38              convertible_to<const _OutIter1&, _OutIter2>
  39   _LIBCPP_HIDE_FROM_ABI constexpr operator in_in_out_result<_InIter3, _InIter4, _OutIter2>() const& {
  40     return {in1, in2, out};
  41   }
  42
  43   template <class _InIter3, class _InIter4, class _OutIter2>
  44     requires convertible_to<_InIter1, _InIter3> && convertible_to<_InIter2, _InIter4> &&
  45              convertible_to<_OutIter1, _OutIter2>
  46   _LIBCPP_HIDE_FROM_ABI constexpr operator in_in_out_result<_InIter3, _InIter4, _OutIter2>() && {
  47     return {std::move(in1), std::move(in2), std::move(out)};
  48   }
  49 };
  50
  51 } // namespace ranges
  52
  53 #endif // _LIBCPP_STD_VER >= 20
  54
  55 _LIBCPP_END_NAMESPACE_STD
  56
  57 _LIBCPP_POP_MACROS
  58
  59 #endif // _LIBCPP___ALGORITHM_IN_IN_OUT_RESULT_H