methods on make

• To: <info-dylan@ai.mit.edu>
• Subject: methods on make
• From: Scott Ribe <scott_ribe@killerbytes.com>
• Date: Tue, 8 May 2001 16:35:58 -0600
• Sender: owner-info-dylan@ai.mit.edu

Would a better example have been reading in a set of UI widgets from a
stream? 

- Call make on the superclass of all the widgets with the stream as an
initarg.
- Read the tag identifying the concrete class from the stream.
- Dispatch to the appropriate make for the concrete class, again passing
the stream.
- Return the actual type to the client code, which does not have to downcast.

That gets rid of the nasty downcast in C++ code for this kind of thing.
But maybe there's a better way in Dylan to address the other issues as well?


Scott Ribe
scott_ribe@killerbytes.com
http://www.killerbytes.com/
(303) 665-7007 voice

• Re: methods on make
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