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 #if _LIBCPP_STD_VER >= 20
  34
  35 _LIBCPP_BEGIN_NAMESPACE_STD
  36
  37 namespace ranges {
  38 namespace __equal_range {
  39
  40 struct __fn {
  41   template <forward_iterator _Iter,
  42             sentinel_for<_Iter> _Sent,
  43             class _Tp,
  44             class _Proj                                                           = identity,
  45             indirect_strict_weak_order<const _Tp*, projected<_Iter, _Proj>> _Comp = ranges::less>
  46   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr subrange<_Iter>
  47   operator()(_Iter __first, _Sent __last, const _Tp& __value, _Comp __comp = {}, _Proj __proj = {}) const {
  48     auto __ret = std::__equal_range<_RangeAlgPolicy>(std::move(__first), std::move(__last), __value, __comp, __proj);
  49     return {std::move(__ret.first), std::move(__ret.second)};
  50   }
  51
  52   template <forward_range _Range,
  53             class _Tp,
  54             class _Proj                                                                        = identity,
  55             indirect_strict_weak_order<const _Tp*, projected<iterator_t<_Range>, _Proj>> _Comp = ranges::less>
  56   _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr borrowed_subrange_t<_Range>
  57   operator()(_Range&& __range, const _Tp& __value, _Comp __comp = {}, _Proj __proj = {}) const {
  58     auto __ret =
  59         std::__equal_range<_RangeAlgPolicy>(ranges::begin(__range), ranges::end(__range), __value, __comp, __proj);
  60     return {std::move(__ret.first), std::move(__ret.second)};
  61   }
  62 };
  63
  64 } // namespace __equal_range
  65
  66 inline namespace __cpo {
  67 inline constexpr auto equal_range = __equal_range::__fn{};
  68 } // namespace __cpo
  69 } // namespace ranges
  70
  71 _LIBCPP_END_NAMESPACE_STD
  72
  73 #endif // _LIBCPP_STD_VER >= 20
  74
  75 #endif // _LIBCPP___ALGORITHM_RANGES_EQUAL_RANGE_H