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From: Georg Bauhaus <sb463ba@l1-hrz.uni-duisburg.de>
Newsgroups: comp.lang.ada
Subject: Re: Upcasting
Date: Wed, 6 Nov 2002 15:18:36 +0000 (UTC)
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Date: 2002-11-06T15:18:36+00:00
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Matthew Baulch <matt@greenroom.com.au> wrote:
: But if you wanted to assign Foo1 to Foo2:
:        Foo2 := (Foo1 with 5.0, 10.0);
: would work.

Not sure I understand your question, because it is not obvious to me
what a varying type is. You could do

   foo2 := (foo1 with derived1 =>  5.0, derived2 => 10.0);

: 
: My question is: How would you do this 'upcasting' if varying
: types existed? Obviously the compiler could tell where each
: value must go based on their type if only one of their type
: was needed in the transition.