std::count

std::count, std::count_if

Defined in header <algorithm>
template< class InputIt, class T >
typename iterator_traits<InputIt>::difference_type
    count( InputIt first, InputIt last, const T &value );
(1)
template< class ExecutionPolicy, class ForwardIt, class T >
typename iterator_traits<ForwardIt>::difference_type
    count( ExecutionPolicy&& policy, ForwardIt first, ForwardIt last, const T &value );
(2) (since C++17)
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