1fe6060f1SDimitry Andric // -*- C++ -*- 2fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 3fe6060f1SDimitry Andric // 4fe6060f1SDimitry Andric // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5fe6060f1SDimitry Andric // See https://llvm.org/LICENSE.txt for license information. 6fe6060f1SDimitry Andric // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7fe6060f1SDimitry Andric // 8fe6060f1SDimitry Andric //===----------------------------------------------------------------------===// 9fe6060f1SDimitry Andric 10fe6060f1SDimitry Andric #ifndef _LIBCPP___ALGORITHM_COUNT_IF_H 11fe6060f1SDimitry Andric #define _LIBCPP___ALGORITHM_COUNT_IF_H 12fe6060f1SDimitry Andric 13fe6060f1SDimitry Andric #include <__config> 14fe6060f1SDimitry Andric #include <__iterator/iterator_traits.h> 15fe6060f1SDimitry Andric 16fe6060f1SDimitry Andric #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17fe6060f1SDimitry Andric # pragma GCC system_header 18fe6060f1SDimitry Andric #endif 19fe6060f1SDimitry Andric 20fe6060f1SDimitry Andric _LIBCPP_BEGIN_NAMESPACE_STD 21fe6060f1SDimitry Andric 22fe6060f1SDimitry Andric template <class _InputIterator, class _Predicate> 23*0fca6ea1SDimitry Andric _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 24fe6060f1SDimitry Andric typename iterator_traits<_InputIterator>::difference_type 25fe6060f1SDimitry Andric count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred) { 26fe6060f1SDimitry Andric typename iterator_traits<_InputIterator>::difference_type __r(0); 27fe6060f1SDimitry Andric for (; __first != __last; ++__first) 28fe6060f1SDimitry Andric if (__pred(*__first)) 29fe6060f1SDimitry Andric ++__r; 30fe6060f1SDimitry Andric return __r; 31fe6060f1SDimitry Andric } 32fe6060f1SDimitry Andric 33fe6060f1SDimitry Andric _LIBCPP_END_NAMESPACE_STD 34fe6060f1SDimitry Andric 35fe6060f1SDimitry Andric #endif // _LIBCPP___ALGORITHM_COUNT_IF_H 36