is_span

Check if this and mem2 share the memory with a common parent memory object and that the memory is contiguous.

If this is the case, the memory of this and mem2 can be merged efficiently by performing share on the parent object from the returned offset.

Parameters:

this	a Memory
mem2	a Memory
offset	a pointer to a result offset

Returns:

true if the memory is contiguous and of a common parent.