1*4bdff4beSrobert //===----------------------------------------------------------------------===//
2*4bdff4beSrobert //
3*4bdff4beSrobert // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4*4bdff4beSrobert // See https://llvm.org/LICENSE.txt for license information.
5*4bdff4beSrobert // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6*4bdff4beSrobert //
7*4bdff4beSrobert //===----------------------------------------------------------------------===//
8*4bdff4beSrobert
9*4bdff4beSrobert #ifndef _LIBCPP___ALGORITHM_RANGES_COUNT_IF_H
10*4bdff4beSrobert #define _LIBCPP___ALGORITHM_RANGES_COUNT_IF_H
11*4bdff4beSrobert
12*4bdff4beSrobert #include <__config>
13*4bdff4beSrobert #include <__functional/identity.h>
14*4bdff4beSrobert #include <__functional/invoke.h>
15*4bdff4beSrobert #include <__functional/ranges_operations.h>
16*4bdff4beSrobert #include <__iterator/concepts.h>
17*4bdff4beSrobert #include <__iterator/incrementable_traits.h>
18*4bdff4beSrobert #include <__iterator/iterator_traits.h>
19*4bdff4beSrobert #include <__iterator/projected.h>
20*4bdff4beSrobert #include <__ranges/access.h>
21*4bdff4beSrobert #include <__ranges/concepts.h>
22*4bdff4beSrobert #include <__utility/move.h>
23*4bdff4beSrobert
24*4bdff4beSrobert #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
25*4bdff4beSrobert # pragma GCC system_header
26*4bdff4beSrobert #endif
27*4bdff4beSrobert
28*4bdff4beSrobert #if _LIBCPP_STD_VER > 17
29*4bdff4beSrobert
30*4bdff4beSrobert _LIBCPP_BEGIN_NAMESPACE_STD
31*4bdff4beSrobert
32*4bdff4beSrobert namespace ranges {
33*4bdff4beSrobert template <class _Iter, class _Sent, class _Proj, class _Pred>
34*4bdff4beSrobert _LIBCPP_HIDE_FROM_ABI constexpr
__count_if_impl(_Iter __first,_Sent __last,_Pred & __pred,_Proj & __proj)35*4bdff4beSrobert iter_difference_t<_Iter> __count_if_impl(_Iter __first, _Sent __last,
36*4bdff4beSrobert _Pred& __pred, _Proj& __proj) {
37*4bdff4beSrobert iter_difference_t<_Iter> __counter(0);
38*4bdff4beSrobert for (; __first != __last; ++__first) {
39*4bdff4beSrobert if (std::invoke(__pred, std::invoke(__proj, *__first)))
40*4bdff4beSrobert ++__counter;
41*4bdff4beSrobert }
42*4bdff4beSrobert return __counter;
43*4bdff4beSrobert }
44*4bdff4beSrobert
45*4bdff4beSrobert namespace __count_if {
46*4bdff4beSrobert struct __fn {
47*4bdff4beSrobert template <input_iterator _Iter, sentinel_for<_Iter> _Sent, class _Proj = identity,
48*4bdff4beSrobert indirect_unary_predicate<projected<_Iter, _Proj>> _Predicate>
49*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
operator__fn50*4bdff4beSrobert iter_difference_t<_Iter> operator()(_Iter __first, _Sent __last, _Predicate __pred, _Proj __proj = {}) const {
51*4bdff4beSrobert return ranges::__count_if_impl(std::move(__first), std::move(__last), __pred, __proj);
52*4bdff4beSrobert }
53*4bdff4beSrobert
54*4bdff4beSrobert template <input_range _Range, class _Proj = identity,
55*4bdff4beSrobert indirect_unary_predicate<projected<iterator_t<_Range>, _Proj>> _Predicate>
56*4bdff4beSrobert _LIBCPP_NODISCARD_EXT _LIBCPP_HIDE_FROM_ABI constexpr
operator__fn57*4bdff4beSrobert range_difference_t<_Range> operator()(_Range&& __r, _Predicate __pred, _Proj __proj = {}) const {
58*4bdff4beSrobert return ranges::__count_if_impl(ranges::begin(__r), ranges::end(__r), __pred, __proj);
59*4bdff4beSrobert }
60*4bdff4beSrobert };
61*4bdff4beSrobert } // namespace __count_if
62*4bdff4beSrobert
63*4bdff4beSrobert inline namespace __cpo {
64*4bdff4beSrobert inline constexpr auto count_if = __count_if::__fn{};
65*4bdff4beSrobert } // namespace __cpo
66*4bdff4beSrobert } // namespace ranges
67*4bdff4beSrobert
68*4bdff4beSrobert _LIBCPP_END_NAMESPACE_STD
69*4bdff4beSrobert
70*4bdff4beSrobert #endif // _LIBCPP_STD_VER > 17
71*4bdff4beSrobert
72*4bdff4beSrobert #endif // _LIBCPP___ALGORITHM_RANGES_COUNT_IF_H
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