move object from heap to stack

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I count it to destroy it if it isn't used anymore.
I can remove this behaviour but IMO with this you haven't 
unnecessary use of stack memory. Am I wrong?
Furthermore, if I copy the stack object e.g. if I pass it as 
value parameter to another function/class, I can store it as long 
as it's needed. Maybe that should be the task of the heap, but 
I'm not sure.