Article View: comp.sys.amiga.tech
Article #13235Re: Mutual Exclude Gadgets
From: Marco Papa
Date: Sat, 30 Dec 1989 07:22
Date: Sat, 30 Dec 1989 07:22
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1593 bytes
In article <555@shodha.dec.com> ridder@elvira.enet.dec.com (Hans Ridder) writes: >In article <22023@usc.edu> papa@pollux.usc.edu (Marco Papa) writes: >>Most data structures (including Gadgets) have "user defined" fields at >>the end of them. That's where you can fool with. >I think your first sentence above was right on the mark though. >I would suggest using the "User" field directly, or as a pointer to >your extension structure. Then future changes to the size of a >structure would not affect you, and your *binary* would be compatible. Absolutely. That's in fact how I recall Commodore implemented the tag structure Extensions to support the VGA and Viking monitors. Make the user-defined field as pointer to a user-defined "struct" with whatever fields you want, and all should be cool for future releases (i.e. nobody should be able to fool with YOUR OWN extension). -- Marco Papa 'Doc' -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-= "Xerox sues somebody for copying?" -- David Letterman -=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
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Path: arc1-ca.pugleaf.net!utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!ames!think!zaphod.mps.ohio-state.edu!usc!pollux.usc.edu!papa From: papa@pollux.usc.edu (Marco Papa) Newsgroups: comp.sys.amiga.tech Subject: Re: Mutual Exclude Gadgets Keywords: Gadgets Message-ID: <22035@usc.edu> Date: 30 Dec 89 07:22:51 GMT References: <947@lpami.wimsey.bc.ca> <22023@usc.edu> <555@shodha.dec.com> Sender: news@usc.edu Organization: Felsina Software, Los Angeles, CA Lines: 20