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IWETHEY Home / IWETHEY Board / Theory and Practice of Programming Forum / Exceptions are one form of Continuation
Post #199,323
by ChrisR
3/17/05 10:33:45 PM
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New Exceptions are one form of Continuation
Icon's Generators are another form. And while we're tossing around various ways to cope with what amounts to problems in program continuity (errors, exceptions, whatever), I should also mention another way that's used to handle errors. Instead of using a setjmp/longjmp type mechanism of throwing/catching exceptions, why not just send a block of code that tells the function what to do in case of error? Of course, this requires lambdas or block closures. But it sends the code down into the place where the exception is easiest to handle (i.e. it is more specific). An example of this would be something akin to Smalltalk's onUnWind: type parameters.
Post #199,340
by static
Picture of static
3/18/05 1:24:49 AM
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New Icon's generators rely on the failure model.
That's how you get back-tracking. :-)

Wade.

Is it enough to love
Is it enough to breathe
Somebody rip my heart out
And leave me here to bleed
 
Is it enough to die
Somebody save my life
I'd rather be Anything but Ordinary
Please

-- "Anything but Ordinary" by Avril Lavigne.
     Question about exceptions - (drewk) - (31) - March 16, 2005, 04:22:29 PM EST
         Lots of discussions about that - (FuManChu) - (6) - March 16, 2005, 04:38:14 PM EST
             That only goes for one kind of exceptions! - (CRConrad) - (1) - March 16, 2005, 04:43:24 PM EST
                 What does the "checked" mean to you? - (FuManChu) - March 16, 2005, 05:55:46 PM EST
             But he's saying that you should use both - (drewk) - (3) - March 16, 2005, 05:18:00 PM EST
                 My rule of thumb is, - (Arkadiy) - March 16, 2005, 05:40:27 PM EST
                 Pick one and stick with it. - (admin) - March 16, 2005, 06:04:02 PM EST
                 You can do both (or more accurately: either) with or without - (FuManChu) - March 16, 2005, 06:05:51 PM EST
         Re: Question about exceptions - (JimWeirich) - (23) - March 16, 2005, 07:35:00 PM EST
             Nice point about responsibility, but grey areas abound - (FuManChu) - (11) - March 16, 2005, 07:46:02 PM EST
                 Re: Nice point about responsibility, but grey areas abound - (JimWeirich) - (10) - March 17, 2005, 03:30:15 PM EST
                     No, we don't - (drewk) - (9) - March 17, 2005, 05:25:32 PM EST
                         The difference is simple - (ben_tilly) - (8) - March 17, 2005, 05:57:25 PM EST
                             Problem with that - (drewk) - (4) - March 17, 2005, 06:13:50 PM EST
                                 See? Whether it is an error IS ambiguous! -NT - (ben_tilly) - (2) - March 17, 2005, 06:19:06 PM EST
                                     I think I know what to do then - (drewk) - (1) - March 17, 2005, 06:28:16 PM EST
                                         Exactly -NT - (ben_tilly) - March 17, 2005, 06:59:56 PM EST
                                 Re: Problem with that - (JimWeirich) - March 17, 2005, 11:59:18 PM EST
                             Thats the sort of logic that makes me wary of exceptions. - (static) - (2) - March 17, 2005, 08:18:40 PM EST
                                 Exceptions are one form of Continuation - (ChrisR) - (1) - March 17, 2005, 10:33:45 PM EST
                                     Icon's generators rely on the failure model. - (static) - March 18, 2005, 01:24:49 AM EST
             Disabling assertions - (ChrisR) - (3) - March 16, 2005, 07:52:17 PM EST
                 That's one of the points he raised - (drewk) - (2) - March 16, 2005, 08:59:04 PM EST
                     Expense is relative - (ChrisR) - March 16, 2005, 11:52:33 PM EST
                     Re: That's one of the points he raised - (JayMehaffey) - March 17, 2005, 08:31:12 AM EST
             DbC? -NT - (drewk) - (6) - March 16, 2005, 09:32:24 PM EST
                 Design by Contract - (Yendor) - (5) - March 16, 2005, 10:05:14 PM EST
                     Not the same thing. - (admin) - (4) - March 16, 2005, 10:31:01 PM EST
                         That's not strictly Eiffel; - (jake123) - (3) - March 17, 2005, 05:31:51 PM EST
                             It's built into Eiffel - (admin) - March 17, 2005, 06:01:57 PM EST
                             It is DESIGN by Contract after all - (JimWeirich) - (1) - March 17, 2005, 11:48:41 PM EST
                                 As you say - (jake123) - March 19, 2005, 03:09:19 AM EST

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