Re: [Cardinal-dev] Does Ruby require restartable exceptions?

[Dan Sugalski]

At 8:28 PM +0200 5/30/02, Erik Bågfors wrote:
> On Thu, 2002-05-30 at 19:10, Dan Sugalski wrote:
> >  At 6:49 PM +0200 5/30/02, Erik Bågfors wrote:
> >  >On Thu, 2002-05-30 at 18:38, Dan Sugalski wrote:
> >  >>  Here's a question. Does Ruby require that you be able to catch an
> >  >>  exception then restart or resume from where the exception was thrown?
> >  >
> >  >AFAIK no,
> >  >
> >  >What you do in ruby is restart by hand.
> >
> >  Cool. I was worried you could do something like:
> >
> >  try {
> >      object.method_which_pitches_exception();
> >  } catch {
> >     resume;
> >  }
> >
> >  and have the resume jump back into the object's method at the place
> >  where it threw the exception. Not having to do that makes life easier.
>
> I've never seen that, but I'm not 100% sure about it.
>
> Another thing you have in ruby is "throw" and "catch".  They have
> nothing to do with the try/catch/throw that you have in for example
> java.

Those are easily handled--they count as specific exception handlers,
and the engine supports them. (The syntax I used was all made up, and
its only syntax anyway, so it's not that important) You'll be able to
establish a dynamically scoped exception handler that will intercept
only one specific exception, a class of exceptions, a list of
exceptions, or suchlike things.
--
                                        Dan

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