libcxx/include/__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 <__algorithm/inplace_merge.h>
  13 #include <__algorithm/iterator_operations.h>
  14 #include <__algorithm/make_projected.h>
  15 #include <__config>
  16 #include <__functional/identity.h>
  17 #include <__functional/invoke.h>
  18 #include <__functional/ranges_operations.h>
  19 #include <__iterator/concepts.h>
  20 #include <__iterator/iterator_traits.h>
  21 #include <__iterator/next.h>
  22 #include <__iterator/projected.h>
  23 #include <__iterator/sortable.h>
  24 #include <__ranges/access.h>
  25 #include <__ranges/concepts.h>
  26 #include <__ranges/dangling.h>
  27 #include <__utility/forward.h>
  28 #include <__utility/move.h>
  29
  30 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  31 #  pragma GCC system_header
  32 #endif
  33
  34 #if _LIBCPP_STD_VER >= 20
  35
  36 _LIBCPP_BEGIN_NAMESPACE_STD
  37
  38 namespace ranges {
  39 namespace __inplace_merge {
  40
  41 struct __fn {
  42   template <class _Iter, class _Sent, class _Comp, class _Proj>
  43   _LIBCPP_HIDE_FROM_ABI static constexpr auto
  44   __inplace_merge_impl(_Iter __first, _Iter __middle, _Sent __last, _Comp&& __comp, _Proj&& __proj) {
  45     auto __last_iter = ranges::next(__middle, __last);
  46     std::__inplace_merge<_RangeAlgPolicy>(
  47         std::move(__first), std::move(__middle), __last_iter, std::__make_projected(__comp, __proj));
  48     return __last_iter;
  49   }
  50
  51   template <bidirectional_iterator _Iter, sentinel_for<_Iter> _Sent, class _Comp = ranges::less, class _Proj = identity>
  52     requires sortable<_Iter, _Comp, _Proj>
  53   _LIBCPP_HIDE_FROM_ABI _Iter
  54   operator()(_Iter __first, _Iter __middle, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
  55     return __inplace_merge_impl(
  56         std::move(__first), std::move(__middle), std::move(__last), std::move(__comp), std::move(__proj));
  57   }
  58
  59   template <bidirectional_range _Range, class _Comp = ranges::less, class _Proj = identity>
  60     requires sortable<iterator_t<_Range>, _Comp, _Proj>
  61   _LIBCPP_HIDE_FROM_ABI borrowed_iterator_t<_Range>
  62   operator()(_Range&& __range, iterator_t<_Range> __middle, _Comp __comp = {}, _Proj __proj = {}) const {
  63     return __inplace_merge_impl(
  64         ranges::begin(__range), std::move(__middle), ranges::end(__range), std::move(__comp), std::move(__proj));
  65   }
  66 };
  67
  68 } // namespace __inplace_merge
  69
  70 inline namespace __cpo {
  71 inline constexpr auto inplace_merge = __inplace_merge::__fn{};
  72 } // namespace __cpo
  73 } // namespace ranges
  74
  75 _LIBCPP_END_NAMESPACE_STD
  76
  77 #endif // _LIBCPP_STD_VER >= 20
  78
  79 #endif // _LIBCPP___ALGORITHM_RANGES_INPLACE_MERGE_H