sum_uint64

Description:


public Collector<uint64?,Object,G> sum_uint64<G> (owned MapFunc<uint64?,G> mapper)

Returns a collector that produces the sum of the given function applied to the elements. If there are no elements, the result is 0.

The mapper function must not return null.

Parameters:

mapper

a mapping function

Returns:

the collector implementation


Namespace: Gpseq.Collectors
Package: gpseq-1.0