@Override
    public long count() {
        return inner.count();
    }
Returns the count of elements in this stream.  This is a special case of
a reduction and is equivalent to:
<pre>{@code
    return mapToLong(e -> 1L).sum();
}</pre>
<p>
This is a terminal operation.

@return  the count of elements in this stream
common-parent/mapstream/src/main/java/com/speedment/common/mapstream/MapStream.java