1e78f53d1SNikolas Klauser // -*- C++ -*- 2e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 3e78f53d1SNikolas Klauser // 4e78f53d1SNikolas Klauser // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5e78f53d1SNikolas Klauser // See https://llvm.org/LICENSE.txt for license information. 6e78f53d1SNikolas Klauser // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7e78f53d1SNikolas Klauser // 8e78f53d1SNikolas Klauser //===----------------------------------------------------------------------===// 9e78f53d1SNikolas Klauser 10*ce777190SNikolas Klauser #ifndef _LIBCPP___CXX03___ALGORITHM_COUNT_IF_H 11*ce777190SNikolas Klauser #define _LIBCPP___CXX03___ALGORITHM_COUNT_IF_H 12e78f53d1SNikolas Klauser 1373fbae83SNikolas Klauser #include <__cxx03/__config> 1473fbae83SNikolas Klauser #include <__cxx03/__iterator/iterator_traits.h> 15e78f53d1SNikolas Klauser 16e78f53d1SNikolas Klauser #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17e78f53d1SNikolas Klauser # pragma GCC system_header 18e78f53d1SNikolas Klauser #endif 19e78f53d1SNikolas Klauser 20e78f53d1SNikolas Klauser _LIBCPP_BEGIN_NAMESPACE_STD 21e78f53d1SNikolas Klauser 22e78f53d1SNikolas Klauser template <class _InputIterator, class _Predicate> 23e78f53d1SNikolas Klauser _LIBCPP_NODISCARD inline _LIBCPP_HIDE_FROM_ABI _LIBCPP_CONSTEXPR_SINCE_CXX20 24e78f53d1SNikolas Klauser typename iterator_traits<_InputIterator>::difference_type 25e78f53d1SNikolas Klauser count_if(_InputIterator __first, _InputIterator __last, _Predicate __pred) { 26e78f53d1SNikolas Klauser typename iterator_traits<_InputIterator>::difference_type __r(0); 27e78f53d1SNikolas Klauser for (; __first != __last; ++__first) 28e78f53d1SNikolas Klauser if (__pred(*__first)) 29e78f53d1SNikolas Klauser ++__r; 30e78f53d1SNikolas Klauser return __r; 31e78f53d1SNikolas Klauser } 32e78f53d1SNikolas Klauser 33e78f53d1SNikolas Klauser _LIBCPP_END_NAMESPACE_STD 34e78f53d1SNikolas Klauser 35*ce777190SNikolas Klauser #endif // _LIBCPP___CXX03___ALGORITHM_COUNT_IF_H 36