Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!bbn!apple!apple.com!shebanow
From: shebanow@apple.com (Andrew Shebanow)
Newsgroups: comp.sys.mac.programmer
Subject: Re: MPW v3.0 and GetNewCWindow
Message-ID: <1584@internal.Apple.COM>
Date: 28 Apr 89 20:42:20 GMT
References: <3855@uhccux.uhcc.hawaii.edu>
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Organization: Apple Computer, Inc.
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The change in the definition of NewCWindow is not a bug: it was a decision 
the MPW group made (with some prodding) to make the libraries easier to 
use.

There is almost no difference between a CWindowPtr and a WindowPtr, except 
for the use of a few fields which should never be accessed by your 
application (let QuickDraw do it!). If we had kept the definitions the way 
they were specified, you would have to do a cast anytime you called a trap 
that returned a WindowPtr as a result, or took a WindowPtr as an argument.

Early versions of MPW 3.0 (alphas) actually had these routines defined to 
take CWindowPtrs, and it was a major pain in the butt.  Count your 
blessings....

Andrew Shebanow
MacDTS
- All Opinions Are Mine, and Mine Alone -