1 // -*- C++ -*- 2 //===----------------------------------------------------------------------===// 3 // 4 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 5 // See https://llvm.org/LICENSE.txt for license information. 6 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 7 // 8 //===----------------------------------------------------------------------===// 9 10 #ifndef _LIBCPP___ALGORITHM_COUNT_H 11 #define _LIBCPP___ALGORITHM_COUNT_H 12 13 #include <__config> 14 #include <__iterator/iterator_traits.h> 15 16 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 17 #pragma GCC system_header 18 #endif 19 20 _LIBCPP_PUSH_MACROS 21 #include <__undef_macros> 22 23 _LIBCPP_BEGIN_NAMESPACE_STD 24 25 template <class _InputIterator, class _Tp> 26 _LIBCPP_NODISCARD_EXT inline _LIBCPP_INLINE_VISIBILITY _LIBCPP_CONSTEXPR_AFTER_CXX17 27 typename iterator_traits<_InputIterator>::difference_type 28 count(_InputIterator __first, _InputIterator __last, const _Tp& __value_) { 29 typename iterator_traits<_InputIterator>::difference_type __r(0); 30 for (; __first != __last; ++__first) 31 if (*__first == __value_) 32 ++__r; 33 return __r; 34 } 35 36 _LIBCPP_END_NAMESPACE_STD 37 38 _LIBCPP_POP_MACROS 39 40 #endif // _LIBCPP___ALGORITHM_COUNT_H 41