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Message-Id: <1787554.iOOKJzCj8L@linux1.krischik.com>
From: Martin Krischik <martin@krischik.com>
Subject: Re: Teaching new tricks to an old dog (C++ -->Ada)
Newsgroups: comp.lang.ada,comp.lang.c++,comp.realtime,comp.software-eng
Reply-To: martin@krischik.com
Date: Fri, 25 Mar 2005 10:25:33 +0100
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Xref: g2news1.google.com comp.lang.ada:9976 comp.lang.c++:47194
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Date: 2005-03-25T10:25:33+01:00
List-Id: <comp.lang.ada>

Hyman Rosen wrote:

> Martin Krischik wrote:
>> As allways: the default behaviour. Default is static inheritance.
> 
> You can't just go willy-nilly making base classes virtual.
> For one thing, constructor arguments for virtual bases must
> be provided by the most derived class.

I don't consider that to be a disadvantage - I do it anyway.

> For another, why do 
> you imagine that there is something wrong with having two
> separate "C" base classes in your example?

That of course depends on the situation. In so far is C++ right to provide
both options. I only criticise the default which is  based on speed and not
on what is right most of the time.

>From my 10+ years of experience I know that you need virtual inheritance in
95% of the cases where a diamond inheritance tree is involved. However,
because static inheritance is default 99.9% of all inheritance is static.

And worse: If it is a 3rd party lib you can't even fix it.

Martin
-- 
mailto://krischik@users.sourceforge.net
Ada programming at: http://ada.krischik.com