John Goerzen wrote:
Python can work that way, but also adds another feature:
try:
blah
moreblah
finally:
foo
And in Haskell we have catch(Dyn), bracket, and finally. Are these not
enough?
I hadn't been aware of finally. That does seem to help.
One of the things I like about exceptions in haskell is that there's
relatively little magic, if a function like finally isn't there, you
can implement it yourself.
m `finally` f = do
r <- m `catch` (\e -> f >> throw e)
f
return r
(I'm ignoring asynchronous exceptions for now, see the code for
Control.Exception for details)
And I find bracket quite useful, it nicely captures a concept you have
to code "by hand" in many other languages. And bracket is also a
function you could have implemented yourself, if it hadn't been
available.
/Peter
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