Creates a sketch out of multiple items.
Creates a sketch out of a single item.
Combines the two sketches.
Combines the two sketches.
The sketches must use the same hash functions.
result of combining l and r
Returns an instance of T calculated by summing all instances in
iter in one pass.
Returns an instance of T calculated by summing all instances in
iter in one pass. Returns None if iter is empty, else
Some[T].
None if iter is empty, else an option value containing the summed T
Override if there is a faster way to compute this sum than
iter.reduceLeftOption using plus.
Returns the identity element of T for plus.
Returns the identity element of T for plus.