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size_type count(const key_type &x) const
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<p>Count the number of key/data pairs having specified key x. </p>
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<p>The number of key/data pairs having x as key within the container. </p>
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<p><a class="ulink" href="http://www.cplusplus.com/reference/stl/multimap/count/" target="_top">http://www.cplusplus.com/reference/stl/multimap/count/</a> </p>
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<p>See of db_map's searching functions group for details about iterator, function version and parameters.</p>
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