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_COUNT_H 10 #define _LIBCPP___ALGORITHM_RANGES_COUNT_H 11 12 #include <__algorithm/count.h> 13 #include <__algorithm/iterator_operations.h> 14 #include <__config> 15 #include <__functional/identity.h> 16 #include <__functional/ranges_operations.h> 17 #include <__iterator/concepts.h> 18 #include <__iterator/incrementable_traits.h> 19 #include <__iterator/iterator_traits.h> 20 #include <__iterator/projected.h> 21 #include <__ranges/access.h> 22 #include <__ranges/concepts.h> 23 #include <__utility/move.h> 24 25 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 26 # pragma GCC system_header 27 #endif 28 29 _LIBCPP_PUSH_MACROS 30 #include <__undef_macros> 31 32 #if _LIBCPP_STD_VER >= 20 33 34 _LIBCPP_BEGIN_NAMESPACE_STD 35 36 namespace ranges { 37 struct __count { 38 template <input_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity> 39 requires indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>, const _Type*> 40 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter> 41 operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) const { 42 return std::__count<_RangeAlgPolicy>(std::move(__first), std::move(__last), __value, __proj); 43 } 44 45 template <input_range _Range, class _Type, class _Proj = identity> 46 requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*> 47 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr range_difference_t<_Range> 48 operator()(_Range&& __r, const _Type& __value, _Proj __proj = {}) const { 49 return std::__count<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), __value, __proj); 50 } 51 }; 52 53 inline namespace __cpo { 54 inline constexpr auto count = __count{}; 55 } // namespace __cpo 56 } // namespace ranges 57 58 _LIBCPP_END_NAMESPACE_STD 59 60 #endif // _LIBCPP_STD_VER >= 20 61 62 _LIBCPP_POP_MACROS 63 64 #endif // _LIBCPP___ALGORITHM_RANGES_COUNT_H 65