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From: jon@cit-vax.Caltech.Edu (Jonathan P. Leech)
Newsgroups: net.lang.c++
Subject: Re: derived classes/nonmember functions
Message-ID: <1007@cit-vax.Caltech.Edu>
Date: Thu, 2-Oct-86 22:51:36 EDT
Article-I.D.: cit-vax.1007
Posted: Thu Oct  2 22:51:36 1986
Date-Received: Sat, 4-Oct-86 08:33:59 EDT
References: <66700004@uiucdcsp>
Reply-To: jon@cit-vax.UUCP (Jonathan P. Leech)
Organization: California Institute of Technology
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In article <66700004@uiucdcsp> gaulke@uiucdcsp.cs.uiuc.edu writes:
>
>I am having a problem with nonmember functions and derived classes.
>Specifically, if I define a nonmember function taking a base class as
>an argument, then C++ (version 1.0) does not allow me to call the same
>function with a derived class as an argument.	The following example
>illustrates the situation:
> ...

    There is at least one good reason this won't work: a derived class
may be larger than its base class. The compiler will calculate the
wrong frame offsets for any other function parameters and possibly for
the class argument as well.
-- 
    Jon Leech (jon@csvax.caltech.edu || ...seismo!cit-vax!jon)
    Caltech Computer Science Graphics Group
    __@/