libcxx/include/__cxx03/__algorithm/ranges_inplace_merge.h

   1 //===----------------------------------------------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #ifndef _LIBCPP___ALGORITHM_RANGES_INPLACE_MERGE_H
  10 #define _LIBCPP___ALGORITHM_RANGES_INPLACE_MERGE_H
  11
  12 #include <__cxx03/__algorithm/inplace_merge.h>
  13 #include <__cxx03/__algorithm/iterator_operations.h>
  14 #include <__cxx03/__algorithm/make_projected.h>
  15 #include <__cxx03/__config>
  16 #include <__cxx03/__functional/identity.h>
  17 #include <__cxx03/__functional/invoke.h>
  18 #include <__cxx03/__functional/ranges_operations.h>
  19 #include <__cxx03/__iterator/concepts.h>
  20 #include <__cxx03/__iterator/iterator_traits.h>
  21 #include <__cxx03/__iterator/next.h>
  22 #include <__cxx03/__iterator/projected.h>
  23 #include <__cxx03/__iterator/sortable.h>
  24 #include <__cxx03/__ranges/access.h>
  25 #include <__cxx03/__ranges/concepts.h>
  26 #include <__cxx03/__ranges/dangling.h>
  27 #include <__cxx03/__utility/forward.h>
  28 #include <__cxx03/__utility/move.h>
  29
  30 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  31 #  pragma GCC system_header
  32 #endif
  33
  34 _LIBCPP_PUSH_MACROS
  35 #include <__cxx03/__undef_macros>
  36
  37 #if _LIBCPP_STD_VER >= 20
  38
  39 _LIBCPP_BEGIN_NAMESPACE_STD
  40
  41 namespace ranges {
  42 namespace __inplace_merge {
  43
  44 struct __fn {
  45   template <class _Iter, class _Sent, class _Comp, class _Proj>
  46   _LIBCPP_HIDE_FROM_ABI static constexpr auto
  47   __inplace_merge_impl(_Iter __first, _Iter __middle, _Sent __last, _Comp&& __comp, _Proj&& __proj) {
  48     auto __last_iter = ranges::next(__middle, __last);
  49     std::__inplace_merge<_RangeAlgPolicy>(
  50         std::move(__first), std::move(__middle), __last_iter, std::__make_projected(__comp, __proj));
  51     return __last_iter;
  52   }
  53
  54   template <bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent, class _Comp = ranges::less, class _Proj = identity>
  55     requires sortable<_Iter, _Comp, _Proj>
  56   _LIBCPP_HIDE_FROM_ABI _Iter
  57   operator()(_Iter __first, _Iter __middle, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
  58     return __inplace_merge_impl(
  59         std::move(__first), std::move(__middle), std::move(__last), std::move(__comp), std::move(__proj));
  60   }
  61
  62   template <bidirectional_range _Range, class _Comp = ranges::less, class _Proj = identity>
  63     requires sortable<iterator_t<_Range>, _Comp, _Proj>
  64   _LIBCPP_HIDE_FROM_ABI borrowed_iterator_t<_Range>
  65   operator()(_Range&& __range, iterator_t<_Range> __middle, _Comp __comp = {}, _Proj __proj = {}) const {
  66     return __inplace_merge_impl(
  67         ranges::begin(__range), std::move(__middle), ranges::end(__range), std::move(__comp), std::move(__proj));
  68   }
  69 };
  70
  71 } // namespace __inplace_merge
  72
  73 inline namespace __cpo {
  74 inline constexpr auto inplace_merge = __inplace_merge::__fn{};
  75 } // namespace __cpo
  76 } // namespace ranges
  77
  78 _LIBCPP_END_NAMESPACE_STD
  79
  80 #endif // _LIBCPP_STD_VER >= 20
  81
  82 _LIBCPP_POP_MACROS
  83
  84 #endif // _LIBCPP___ALGORITHM_RANGES_INPLACE_MERGE_H