The unordered_map::bucket() is a built-in STL function in C++ which returns the bucket number where the element with the key k is located in the map.
Parameter: The function accepts one mandatory parameter key which specifies the key whose bucket number is to be returned.
Return Value: This method returns an unsigned integral type which represents the bucket number of the key k which is passed in the parameter.
Below program illustrate the unordered_map::bucket() function:
The bucket number of key France is 3