Path: utzoo!attcan!uunet!aplcen!samsung!usc!apple!lsr
From: lsr@Apple.COM (Larry Rosenstein)
Newsgroups: comp.sys.mac.programmer
Subject: Re: Multiple Inheritance for HandleObjects in C++
Message-ID: <8937@goofy.Apple.COM>
Date: 29 Jun 90 23:59:45 GMT
References: <15132@reed.UUCP> <268BA8DC.4CD4@intercon.com>
Organization: Apple Computer, Inc.
Lines: 23

In article <268BA8DC.4CD4@intercon.com> amanda@mermaid.intercon.com (Amanda Walker) writes:
>
>The short answer is that HandleObjects, which were designed to allow
>compatibility with Object Pascal, are incapable of representing objects with

The PascalObject class provides compatibility with Object Pascal.

HandleObjects are separate from PascalObjects.  They are essentially native
C++ objects with the restrictions that multiple inheritance isn't allowed
and the objects must be allocated on the heap.  (Since multiple inheritance
isn't allowed, they probably use the older & more efficient C++ runtime
implementation.)

There's also the class SingleObject, which also uses the older
implementation, and therefore doesn't support multiple inheritance.
SingleObjects are allocated on the heap as non-relocatable pointers and can
be allocated on the stack.

-- 
		 Larry Rosenstein,  Object Specialist
 Apple Computer, Inc.  20525 Mariani Ave, MS 46-B  Cupertino, CA 95014
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