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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 key to count. </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/map/count/" target="_top">http://www.cplusplus.com/reference/stl/map/count/</a> </p>
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<p>The following functions are returning iterators, and they by default return read-write iterators.</p>
<p>If you intend to use the returned iterator only to read, you should call the const version of each function using a const reference to this container. Using const iterators can potentially promote concurrency a lot. You can also set the readonly parameter to each non-const version of the functions to true if you don't use the returned iterator to write, which also promotes concurrency and overall performance. </p>
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