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From: Pascal Obry <p.obry@wanadoo.fr>
Newsgroups: comp.lang.ada
Subject: Re: Two class-wide operands, but only one controlling
Date: 24 Nov 2002 22:56:44 +0100
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porton@ex-code.com (Victor Porton) writes:

> Not what I need. basically I have a container and an iterator.
> Both a derived (in my case I need this) from abstract container
> and abstract iterator. I need procedure like:
> 
> procedure Next
>   (C: Abstract_Container'Class; I: in out Abstract_Iterator'Class);
>   
> but this is an error as we have two controlling operands of
> different types :-( 

Certainly not. 'Class formal parameters are not controlling operands, your
Next procedure above is perfectly legal.

> It was simple in C++. Ada has disadvantages...

No, you misunderstood Ada :)

> > The actual parameter of a class-wide formal parameter cannot be a
> > controlling operand.
> 
> Samuel, di you meant vice versa?

No, we have be 2 of us saying the same thing but you did not listen :)

Pascal.

-- 

--|------------------------------------------------------
--| Pascal Obry                           Team-Ada Member
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