I could made what i wanted without the exception , since i need to browse
the whole list.
But i understood that the exception is not the wrong way of do things.
Thanks for the example
2011/10/5 Romain Beauxis <[email protected]>
> 2011/10/5 David Baelde <[email protected]>:
> > Hi Fabio,
>
> Hi all!
>
> > Using exceptions in that kind of code is not wrong, and it's more
> > efficient. Without it, we would have to continue the folding over the
> > rest of the list, even though we already know what we've found. By
> > raising an exception, we interrupt that computation and jump directly
> > to the handler.
> >
> > Exceptions in OCaml are very fast, pretty much a goto/longjmp. This is
> > why (unlike in other languages) they can be used in interesting ways
> > as a programming construct, and not only for errors / exceptional
> > cases.
>
> Not to be pedantic, but the truth is also that fold_left provides a
> quick way to implement what you want, therefore we use exceptions to
> make use of it.
>
> You could do it without exceptions and with a tail-recursive function this
> way:
>
> let rec f result list =
> match list with
> | x :: list' ->
> let result' = (something about x and result.. ) in
> if (for some reason I shall stop) then
> result'
> else
> f result' list'
> | [] ->
> (here it depends: maybe return result,
> or assert false, or..)
> in
> let result = f 0 list in
> (...)
>
> If you are interested into this, we could continue that discussion on
> -devl. In particular, tail-recursive functions are very important in
> OCaml..
>
> Romain
>
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