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_IF_H 10 #define _LIBCPP___ALGORITHM_RANGES_COUNT_IF_H 11 12 #include <__algorithm/count_if.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_if { 38 template <input_iterator _Iter, 39 sentinel_for<_Iter> _Sent, 40 class _Proj = identity, 41 indirect_unary_predicate<projected<_Iter, _Proj>> _Predicate> 42 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr iter_difference_t<_Iter> 43 operator()(_Iter __first, _Sent __last, _Predicate __pred, _Proj __proj = {}) const { 44 return std::__count_if<_RangeAlgPolicy>(std::move(__first), std::move(__last), __pred, __proj); 45 } 46 47 template <input_range _Range, 48 class _Proj = identity, 49 indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Predicate> 50 [[nodiscard]] _LIBCPP_HIDE_FROM_ABI constexpr range_difference_t<_Range> 51 operator()(_Range&& __r, _Predicate __pred, _Proj __proj = {}) const { 52 return std::__count_if<_RangeAlgPolicy>(ranges::begin(__r), ranges::end(__r), __pred, __proj); 53 } 54 }; 55 56 inline namespace __cpo { 57 inline constexpr auto count_if = __count_if{}; 58 } // namespace __cpo 59 } // namespace ranges 60 61 _LIBCPP_END_NAMESPACE_STD 62 63 #endif // _LIBCPP_STD_VER >= 20 64 65 _LIBCPP_POP_MACROS 66 67 #endif // _LIBCPP___ALGORITHM_RANGES_COUNT_IF_H 68