libcxx/include/__algorithm/ranges_equal_range.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_EQUAL_RANGE_H
  10 #define _LIBCPP___ALGORITHM_RANGES_EQUAL_RANGE_H
  11
  12 #include <__algorithm/equal_range.h>
  13 #include <__algorithm/iterator_operations.h>
  14 #include <__config>
  15 #include <__functional/identity.h>
  16 #include <__functional/invoke.h>
  17 #include <__functional/ranges_operations.h>
  18 #include <__iterator/concepts.h>
  19 #include <__iterator/iterator_traits.h>
  20 #include <__iterator/projected.h>
  21 #include <__ranges/access.h>
  22 #include <__ranges/concepts.h>
  23 #include <__ranges/dangling.h>
  24 #include <__ranges/subrange.h>
  25 #include <__utility/forward.h>
  26 #include <__utility/move.h>
  27 #include <__utility/pair.h>
  28
  29 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
  30 #  pragma GCC system_header
  31 #endif
  32
  33 _LIBCPP_PUSH_MACROS
  34 #include <__undef_macros>
  35
  36 #if _LIBCPP_STD_VER >= 20
  37
  38 _LIBCPP_BEGIN_NAMESPACE_STD
  39
  40 namespace ranges {
  41 struct __equal_range {
  42   template <forward_iterator _Iter,
  43             sentinel_for<_Iter> _Sent,
  44             class _Tp,
  45             class _Proj                                                           = identity,
  46             indirect_strict_weak_order<const _Tp*, projected<_Iter, _Proj>> _Comp = ranges::less>
  47   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
  48   operator()(_Iter __first, _Sent __last, const _Tp& __value, _Comp __comp = {}, _Proj __proj = {}) const {
  49     auto __ret = std::__equal_range<_RangeAlgPolicy>(std::move(__first), std::move(__last), __value, __comp, __proj);
  50     return {std::move(__ret.first), std::move(__ret.second)};
  51   }
  52
  53   template <forward_range _Range,
  54             class _Tp,
  55             class _Proj                                                                        = identity,
  56             indirect_strict_weak_order<const _Tp*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
  57   [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
  58   operator()(_Range&& __range, const _Tp& __value, _Comp __comp = {}, _Proj __proj = {}) const {
  59     auto __ret =
  60         std::__equal_range<_RangeAlgPolicy>(ranges::begin(__range), ranges::end(__range), __value, __comp, __proj);
  61     return {std::move(__ret.first), std::move(__ret.second)};
  62   }
  63 };
  64
  65 inline namespace __cpo {
  66 inline constexpr auto equal_range = __equal_range{};
  67 } // namespace __cpo
  68 } // namespace ranges
  69
  70 _LIBCPP_END_NAMESPACE_STD
  71
  72 #endif // _LIBCPP_STD_VER >= 20
  73
  74 _LIBCPP_POP_MACROS
  75
  76 #endif // _LIBCPP___ALGORITHM_RANGES_EQUAL_RANGE_H