Dispose Map Class

I need to use the map class in a loop where I need to create a new instance per iteration.  But I want to make sure that I dispose of the last instance.

MyMap = new Map(Types::Int64, Types::Container);

So I think setting the Map to null at the end of the loop should clear it for reuse at the beginning of the loop.

MyMap = null;

I think that does the trick.

Does that sound right or is there a better way?

Thanks