std::unordered_multimap<Key,T,Hash,KeyEqual,Allocator>::bucket_count
From cppreference.com
                    
                                        
                    < cpp | container | unordered multimap
                    
                                                            
                    
|   size_type bucket_count() const;  | 
(since C++11) | |
Returns the number of buckets in the container.
Parameters
(none)
Return value
The number of buckets in the container.
Complexity
Constant.
See also
|    returns the number of elements in specific bucket  (public member function)  | |
|    returns the maximum number of buckets  (public member function)  |