Python-based monads essay part 2
Gregory Ewing
greg.ewing at canterbury.ac.nz
Thu Oct 20 06:34:48 EDT 2016
Marko Rauhamaa wrote:
> def main():
> try:
> guard_it()
> except ValueError:
> # I'm having none of it!
> resume "CarryOn!"
>
> The problem is, how can the file f unclose itself when work resumes?
The same thing could happen in Scheme, though. Re-entering a
context via a continuation doesn't magically reset everything
to the way it was at some earlier time. A data structure that
has been mutated will still be mutated, and a file that has
been closed will still be closed.
--
Greg
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