libcxx/include/__algorithm/ranges_unique.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_UNIQUE_H
  10 #define _LIBCPP___ALGORITHM_RANGES_UNIQUE_H
  11
  12 #include <__algorithm/iterator_operations.h>
  13 #include <__algorithm/make_projected.h>
  14 #include <__algorithm/unique.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/permutable.h>
  22 #include <__iterator/projected.h>
  23 #include <__ranges/access.h>
  24 #include <__ranges/concepts.h>
  25 #include <__ranges/dangling.h>
  26 #include <__ranges/subrange.h>
  27 #include <__utility/forward.h>
  28 #include <__utility/move.h>
  29 #include <__utility/pair.h>
  30
  31 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  32 #  pragma GCC system_header
  33 #endif
  34
  35 #if _LIBCPP_STD_VER >= 20
  36
  37 _LIBCPP_BEGIN_NAMESPACE_STD
  38
  39 namespace ranges {
  40 namespace __unique {
  41
  42 struct __fn {
  43   template <permutable _Iter,
  44             sentinel_for<_Iter> _Sent,
  45             class _Proj                                                  = identity,
  46             indirect_equivalence_relation<projected<_Iter, _Proj>> _Comp = ranges::equal_to>
  47   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
  48   operator()(_Iter __first, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
  49     auto __ret =
  50         std::__unique<_RangeAlgPolicy>(std::move(__first), std::move(__last), std::__make_projected(__comp, __proj));
  51     return {std::move(__ret.first), std::move(__ret.second)};
  52   }
  53
  54   template <forward_range _Range,
  55             class _Proj                                                               = identity,
  56             indirect_equivalence_relation<projected<iterator_t<_Range>, _Proj>> _Comp = ranges::equal_to>
  57     requires permutable<iterator_t<_Range>>
  58   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
  59   operator()(_Range&& __range, _Comp __comp = {}, _Proj __proj = {}) const {
  60     auto __ret = std::__unique<_RangeAlgPolicy>(
  61         ranges::begin(__range), ranges::end(__range), std::__make_projected(__comp, __proj));
  62     return {std::move(__ret.first), std::move(__ret.second)};
  63   }
  64 };
  65
  66 } // namespace __unique
  67
  68 inline namespace __cpo {
  69 inline constexpr auto unique = __unique::__fn{};
  70 } // namespace __cpo
  71 } // namespace ranges
  72
  73 _LIBCPP_END_NAMESPACE_STD
  74
  75 #endif // _LIBCPP_STD_VER >= 20
  76
  77 #endif // _LIBCPP___ALGORITHM_RANGES_UNIQUE_H