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Re: The subsetting has begun

• To: "Alaric B. Snell" <alaric@a...>
• Subject: Re: The subsetting has begun
• From: "Karl Waclawek" <karl@w...>
• Date: Sun, 23 Feb 2003 19:36:07 -0500
• Cc: <xml-dev@l...>
• References: <E18mPk8-0004nL-00@m...> <20030223105044.4564A5542@c...> <000d01c2db61$c4caf060$0207a8c0@karl> <E18n2rF-0004lZ-00@c...>

> Well, in Java, an exception handler is executed in the environment it is 
> declared in, rather than where it's thrown. That means that if you rethrow an 
> exception from a catch block, the catching of that exception begins in the 
> stack frame of the try statement, not of the original throw.

Throwing it back, so to speak - cool!

<snip good stuff/>

Thanks for taking the time to write such a detailed reply!

> > How fast can they be - if the problem is inherently more complex,
> > then implementations tend to be more complex and slower too.
> 
> I think the runtime algorithm required to match the thrown exception to the 
> correct handler is probably the most inherently complex part. The actual 
> control transfer can be done most efficiently with a stored failure 
> continuation.

The question is: at what cost does on get efficient exception handling?
Are continuation languages slower and/or more complex to implement?

> Indeed, for a specific case like stopping SAX processing, you 
> could just put an 'abort' continuation in thread-local storage before 
> starting the SAX parser, and just invoke it when needed in the SAX handler :-)

Now I am getting even more dissatisfied. In addition to genericity
I also want continuations in Delphi/Java/C#/C++. (it's probably possible
in C++, but I am no expert in it). ;-)

Karl

• Follow-Ups:
  • Re: The subsetting has begun
    • From: "Alaric B. Snell" <alaric@a...>
  • Re: The subsetting has begun
    • From: "Thomas B. Passin" <tpassin@c...>

• References:
  • Re: The subsetting has begun
    • From: John Cowan <cowan@m...>
  • Re: The subsetting has begun
    • From: Alaric Snell <alaric@a...>
  • Re: The subsetting has begun
    • From: "Karl Waclawek" <karl@w...>
  • Re: The subsetting has begun
    • From: "Alaric B. Snell" <alaric@a...>

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