libcxx/include/__cxx03/__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 <__cxx03/__algorithm/iterator_operations.h>
  13 #include <__cxx03/__algorithm/make_projected.h>
  14 #include <__cxx03/__algorithm/unique.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/permutable.h>
  22 #include <__cxx03/__iterator/projected.h>
  23 #include <__cxx03/__ranges/access.h>
  24 #include <__cxx03/__ranges/concepts.h>
  25 #include <__cxx03/__ranges/dangling.h>
  26 #include <__cxx03/__ranges/subrange.h>
  27 #include <__cxx03/__utility/forward.h>
  28 #include <__cxx03/__utility/move.h>
  29 #include <__cxx03/__utility/pair.h>
  30
  31 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  32 #  pragma GCC system_header
  33 #endif
  34
  35 _LIBCPP_PUSH_MACROS
  36 #include <__cxx03/__undef_macros>
  37
  38 #if _LIBCPP_STD_VER >= 20
  39
  40 _LIBCPP_BEGIN_NAMESPACE_STD
  41
  42 namespace ranges {
  43 namespace __unique {
  44
  45 struct __fn {
  46   template <permutable _Iter,
  47             sentinel_for<_Iter> _Sent,
  48             class _Proj                                                  = identity,
  49             indirect_equivalence_relation<projected<_Iter, _Proj>> _Comp = ranges::equal_to>
  50   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
  51   operator()(_Iter __first, _Sent __last, _Comp __comp = {}, _Proj __proj = {}) const {
  52     auto __ret =
  53         std::__unique<_RangeAlgPolicy>(std::move(__first), std::move(__last), std::__make_projected(__comp, __proj));
  54     return {std::move(__ret.first), std::move(__ret.second)};
  55   }
  56
  57   template <forward_range _Range,
  58             class _Proj                                                               = identity,
  59             indirect_equivalence_relation<projected<iterator_t<_Range>, _Proj>> _Comp = ranges::equal_to>
  60     requires permutable<iterator_t<_Range>>
  61   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
  62   operator()(_Range&& __range, _Comp __comp = {}, _Proj __proj = {}) const {
  63     auto __ret = std::__unique<_RangeAlgPolicy>(
  64         ranges::begin(__range), ranges::end(__range), std::__make_projected(__comp, __proj));
  65     return {std::move(__ret.first), std::move(__ret.second)};
  66   }
  67 };
  68
  69 } // namespace __unique
  70
  71 inline namespace __cpo {
  72 inline constexpr auto unique = __unique::__fn{};
  73 } // namespace __cpo
  74 } // namespace ranges
  75
  76 _LIBCPP_END_NAMESPACE_STD
  77
  78 #endif // _LIBCPP_STD_VER >= 20
  79
  80 _LIBCPP_POP_MACROS
  81
  82 #endif // _LIBCPP___ALGORITHM_RANGES_UNIQUE_H