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From: Vincent Marciante <marciant_antispam@li.net>
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Subject: Re: When to use 'Class in a parameter list
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Date: Mon, 23 Jul 2001 22:22:02 -0400
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Date: 2001-07-23T22:22:02-04:00
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Marin David Condic wrote:
> 
> In code:
> 
> procedure Op (Base : in out Base_Type) ;
> ...
> X : Child_Type ;
> ...
> Op (X) ; --  Why is this working without a Base_Type (X) conversion???
> 

Assuming that Op is defined as a primative of Base_Type then
a procedure

   procedure Op (Base : in out Child_Type) ;

automaticaly exists as a consequence of having derived
Child_Type from Base_Type.  

This is the case for all derived types and has nothing 
to do with the taggedness of the types in question.