Bucket count equals to the number of the elements can be saved in the
container in the best case scenario for key distribution, i.d. every key
has a unique hash value. In a worse case the bucket count can be less
than the number of elements stored in the container.
Returns current bucket count in the container.
Bucket count equals to the number of the elements can be saved in the container in the best case scenario for key distribution, i.d. every key has a unique hash value. In a worse case the bucket count can be less than the number of elements stored in the container.