libcxx/include/__algorithm/in_out_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_OUT_OUT_RESULT_H
  11 #define _LIBCPP___ALGORITHM_IN_OUT_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 template <class _InIter1, class _OutIter1, class _OutIter2>
  30 struct in_out_out_result {
  31   _LIBCPP_NO_UNIQUE_ADDRESS _InIter1 in;
  32   _LIBCPP_NO_UNIQUE_ADDRESS _OutIter1 out1;
  33   _LIBCPP_NO_UNIQUE_ADDRESS _OutIter2 out2;
  34
  35   template <class _InIter2, class _OutIter3, class _OutIter4>
  36     requires convertible_to<const _InIter1&, _InIter2> && convertible_to<const _OutIter1&, _OutIter3> &&
  37              convertible_to<const _OutIter2&, _OutIter4>
  38   _LIBCPP_HIDE_FROM_ABI constexpr operator in_out_out_result<_InIter2, _OutIter3, _OutIter4>() const& {
  39     return {in, out1, out2};
  40   }
  41
  42   template <class _InIter2, class _OutIter3, class _OutIter4>
  43     requires convertible_to<_InIter1, _InIter2> && convertible_to<_OutIter1, _OutIter3> &&
  44              convertible_to<_OutIter2, _OutIter4>
  45   _LIBCPP_HIDE_FROM_ABI constexpr operator in_out_out_result<_InIter2, _OutIter3, _OutIter4>() && {
  46     return {std::move(in), std::move(out1), std::move(out2)};
  47   }
  48 };
  49 } // namespace ranges
  50
  51 #endif // _LIBCPP_STD_VER >= 20
  52
  53 _LIBCPP_END_NAMESPACE_STD
  54
  55 _LIBCPP_POP_MACROS
  56
  57 #endif // _LIBCPP___ALGORITHM_IN_OUT_OUT_RESULT_H