Path: utzoo!utgpu!jarvis.csri.toronto.edu!mailrus!shadooby!samsung!usc!apple!Apple.COM!lsr
From: lsr@Apple.COM (Larry Rosenstein)
Newsgroups: comp.sys.mac.programmer
Subject: Re: C++ interface to Object Pascal, whyfor?
Message-ID: <5175@internal.Apple.COM>
Date: 14 Nov 89 00:18:06 GMT
Sender: usenet@Apple.COM
Organization: Objects-R-Us,  Apple Computer, Inc.
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References:<934@swbatl.UUCP> <5162@internal.Apple.COM>

In article <5162@internal.Apple.COM> lsr@Apple.COM (Larry Rosenstein) 
writes:

> (3) You can use handle-based objects with C++ dispatching.

When I tried this out, I discovered that HandleObjects use C++ 1.2 
dispatching, which means you can't use multiple inheritance with 
subclasses of HandleObject.  (If I had a copy of the MPW C++ manual, I 
would have known this, but I don't)

I don't know why HandleObjects are implemented this way; offhand, I can't 
think of a technical reason why this would be the case.  One should be 
able to overload operator new, operator delete, operator * and operator -> 
to implement handle-based objects with C++ 2.0 dispatching.

Larry Rosenstein, Apple Computer, Inc.
Object Specialist

Internet: lsr@Apple.com   UUCP: {nsc, sun}!apple!lsr
AppleLink: Rosenstein1