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From: "RasikaSrinivasan@gmail.com" <RasikaSrinivasan@gmail.com>
Newsgroups: comp.lang.ada
Subject: Re: package Ada.Tags
Date: Thu, 7 Jun 2012 14:48:20 -0700 (PDT)
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Date: 2012-06-07T14:48:20-07:00
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Thanks. It worked.

The question of exact application is valid of course and requires thinking.

cheers, srini

On Thursday, June 7, 2012 5:35:11 PM UTC-4, Simon Wright wrote:
> "RasikaSrinivasan@gmail.com" <RasikaSrinivasan@gmail.com> writes:
> 
> >    procedure show (event : events_record_type) is
> >       use GNAT.Calendar.Time_IO;
> >    begin
> >       put( ada.Tags.Expanded_Name( event'tag ) );
> >       put( gnat.Calendar.time_io.Image( event.time , gnat.Calendar.Time_IO.ISO_Date & " %T")) ;
> >    end show;
> >
> > gives me a compilation error:
> >
> > "tag" attribute can only be applied to objects of class - wide type.
> >
> > In the above, isnt event an object meeting this criterion?
> >
> > clearly i am missing something. The question is I want to find out the
> > equivalent of RTTI from C++. ie Which one if the derived types is it.
> 
> You can get it to compile by converting the object 'event' of a specific
> type to the class-wide type:
> 
>   Events_Record_Type'Class (Event)'Tag
> 
> But, how are you going to get Show(Events_Record_Type) to be called?