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21 lines
669 B
C++
21 lines
669 B
C++
#ifndef SPROUT_ALGORITHM_COUNT_IF_HPP
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#define SPROUT_ALGORITHM_COUNT_IF_HPP
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#include <iterator>
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#include <sprout/config.hpp>
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#include <sprout/iterator/operation.hpp>
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namespace sprout {
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// Copyright (C) 2011 RiSK (sscrisk)
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// 25.2.9 Count
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template<typename InputIterator, typename Predicate>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
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count_if(InputIterator first, InputIterator last, Predicate pred) {
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return first == last ? 0
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: (pred(*first) != false ? 1 : 0) + sprout::count_if(sprout::next(first), last, pred)
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;
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}
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} // namespace sprout
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#endif // #ifndef SPROUT_ALGORITHM_COUNT_IF_HPP
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