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Newsgroups: comp.lang.ada
Subject: Re: What makes a procedure call 'dispatching' in Ada?
From: "Peter C. Chapin" <pcc482719@gmail.com>
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Date: 21 Nov 2009 14:07:12 GMT
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Date: 2009-11-21T14:07:12+00:00
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Markus Schoepflin <nospam@no.spam> wrote in
news:he67b2$h79$1@nntp.ilk.net: 

> And one more question, can I have a dispatching procedure that doesn't
> explicitly use the type it dispatches on? In C++, that would read:
> 
> class foo
> {
>    virtual void f() = 0;
> };
> 
> class bar
> {
>    void f() {
>      // Do something just depending on class type bar,
>      // not on an object of the class, so the 'this' pointer
>      // actually is never used.
>    }
> };

The 'this' pointer might never be used, but it is still there anyway. Ada's 
approach to object oriented programming requires that you make 'this' 
explicit. You can, of course, choose to ignore it as well.

Peter