Path: utzoo!censor!geac!torsqnt!news-server.csri.toronto.edu!cs.utexas.edu!usc!apple!lins
From: lins@Apple.COM (Chuck Lins)
Newsgroups: comp.lang.modula2
Subject: Re:  Exceptions (was Type extension, Oberon)
Message-ID: <40148@apple.Apple.COM>
Date: 9 Apr 90 17:21:18 GMT
References: <9004061748.AA07286@ctc.contel.com> <35384@brunix.UUCP>
Organization: Apple Computer Inc, Cupertino, CA
Lines: 20

In article <35384@brunix.UUCP> drc@cs.brown.edu (David R. Chase) writes:
[well a bunch of stuff deleted, you'll have to read them yourself]

Both Dan and David make good points. One alternative that hasn't been mentioned
yet is implementing a module for exception handling. Such a module requires
a bit of assembly language coding for the implementation but it can (and has)
been done. This is how MacApp(R) implements a signaling exception mechanism
in a language without exception handling features (Object Pascal). This
overhead at run-time is minimal. So you can have an efficient, exception
mechanism in a language without exceptions. BTW, the Metrowerks Modula-2
compiler for the Macintosh(TM) provides just such a module.


-- 
Chuck Lins               | "Exit left to funway."
Apple Computer, Inc.     | Internet: lins@apple.com
20525 Mariani Avenue     | AppleLink: LINS
Mail Stop 41-K           | 
Cupertino, CA 95014      | "Self-proclaimed Object Oberon Evangelist"
The intersection of Apple's ideas and my ideas yields the empty set.