count
Function Details
size_type count(const key_type &x) const
Count the number of key/data pairs having specified key x.
Parameters
x
The key to count.
Return Value
The number of key/data pairs having x as key within the container.
See Also
http://www.cplusplus.com/reference/stl/map/count/
Group: Searching Functions
The following functions are returning iterators, and they by default return read-write iterators.
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.