std::unordered_set<Key,Hash,KeyEqual,Allocator>:: bucket_size

From cppreference.com

size_type bucket_size ( size_type n ) const ;
(since C++11)

Returns the number of elements in the bucket with index n .

Parameters

n - the index of the bucket to examine

Return value

The number of elements in the bucket n .

Complexity

Linear in the size of the bucket n .

See also

returns the number of buckets
(public member function)