callCC in 2.7.0
Would anyone like to explain if callCC in R 2.7.0 gives anything that on.exit does not already provide? It seems that the exit condition once defined cannot be added to overridden whereas with on.exit multiple on.exit's add additional on.exits rather than being ignored. Is this important?
It facilitates a completely different style of programming - see http://en.wikipedia.org/wiki/Continuation-passing_style -- http://had.co.nz/