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44 lines
1.4 KiB
Text
44 lines
1.4 KiB
Text
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.. _sprout-algorithm-count:
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###############################################################################
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count
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###############################################################################
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Interface
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========================================
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.. sourcecode:: c++
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template<typename InputIterator, typename T>
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inline SPROUT_CONSTEXPR typename std::iterator_traits<InputIterator>::difference_type
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count(InputIterator first, InputIterator last, T const& value);
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Returns
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========================================
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| The number of iterators i in the range [first,last) for which the following corresponding conditions hold: ``*i == value``.
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Examples
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========================================
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.. sourcecode:: c++
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#include <sprout/algorithm/count.hpp>
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#include <sprout/array.hpp>
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#include <sprout/container.hpp>
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using namespace sprout;
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SPROUT_STATIC_CONSTEXPR auto input = array<int, 10>{{1, 2, 3, 5, 5, 5, 5, 8, 9, 10}};
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SPROUT_STATIC_CONSTEXPR auto result = sprout::count(begin(input), end(input), 5);
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static_assert(result == 4, "counted 4 elements equal to 5 from input.");
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Complexity
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========================================
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| Exactly ``last - first`` applications of the predicate.
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| Recursive function invocations in *O(logN)* (logarithmic) depth.
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Header
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========================================
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| ``sprout/algorithm/count.hpp``
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| Convenience header: ``sprout/algorithm.hpp``
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