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Re: So, what the heck is a continuation anyway?
>>>>> "DS" == Dan Sugalski <firstname.lastname@example.org> writes:
DS> can I get a continuation object/marker from within A and pass it
DS> to B, which then triggers it and returns to A even though I've
DS> unwound the stack frames for A?
>> You can invoke the continuation and return through A an arbitrary
>> number of times.
DS> Hmmm. That means I need to snapshot the stack frames and the
DS> scratchpads. Doable.
The problem we run into with Python is that there are so many places
where C stack frames get intermingled with a chain of Python stack
frames: All of the operator overloading (special methods like __eq__)
dispatch through a C function call. Builtin functions like map are
implemented in C. Extensions modules written in C can invoke Python
code at arbitrary times -- say in a Tk callback.