unicast delegate=(carefully)generalized func ptr

The delegate construct is related to func pointer, functor, java SAM interfaces … A beginner need not grasp all the relations but sooner or later we have to.

I feel delegate was invented much later and is a generalization of those predecessors.

http://bigblog.tanbin.com/2010/11/delegate-instance-2-field-heap-object.html is the best sound byte I have come up with. ** The 2-pointer construct is innovative. **

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