Re: PATCH: ObjC++ template expansion -- Part 1

[Ziemowit Laski <zlaski at apple dot com>]

On 14 Sep 2004, at 0.04, Kai Henningsen wrote:

> mark@codesourcery.com (Mark Mitchell)  wrote on 13.09.04 in 
> <4145F860.3000404@codesourcery.com>:
>
> > language feature.  Objective-C++ seems to want to say "these two types
> > are the same (in that you can intra-convert between them) but also not
> > the same (in the sense that you have to know which one you have)."  If
> > that's the case, then I think we've got the wrong approach here.  The
>
> It is a little bit (but not exactly) like multiple inheritance,

Yes, the usage of ObjC protocols is sort of like C++ multiple 
inheritance;
the protocols themselves can be thought of as abstract base classes 
with no
data members (and no member function definitions, only pure virtuals).

A much simpler way to describe ObjC protocols is to say that they are 
like
Java interfaces.  In fact, I believe the latter were inspired by the 
former.

--Zem
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Ziemowit Laski                 1 Infinite Loop, MS 301-2K
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