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 namespace __count { 38 struct __fn { 39 template <input_iterator _Iter, sentinel_for<_Iter> _Sent, class _Type, class _Proj = identity> 40 requires indirect_binary_predicate<ranges::equal_to, projected<_Iter, _Proj>, const _Type*> 41 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter> 42 operator()(_Iter __first, _Sent __last, const _Type& __value, _Proj __proj = {}) const { 43 return std::__count<_RangeAlgPolicy>(std::move(__first), std::move(__last), __value, __proj); 44 } 45 46 template <input_range _Range, class _Type, class _Proj = identity> 47 requires indirect_binary_predicate<ranges::equal_to, projected<iterator_t<_Range>, _Proj>, const _Type*> 48 _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr range_difference_t<_Range> 49 operator()(_Range&& __r, const _Type& __value, _Proj __proj = {}) const { 50 return std::__count<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), __value, __proj); 51 } 52 }; 53 } // namespace __count 54 55 inline namespace __cpo { 56 inline constexpr auto count = __count::__fn{}; 57 } // namespace __cpo 58 } // namespace ranges 59 60 _LIBCPP_END_NAMESPACE_STD 61 62 #endif // _LIBCPP_STD_VER >= 20 63 64 _LIBCPP_POP_MACROS 65 66 #endif // _LIBCPP___ALGORITHM_RANGES_COUNT_H 67