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From: Ted Dennison <dennison@telepath.com>
Subject: Re: Enumeration representation
Date: 1999/09/10
Message-ID: <7rb8c3$fql$1@nnrp1.deja.com>#1/1
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References: <37D8E3BC.175DB72C@newtech.it>
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Date: 1999-09-10T00:00:00+00:00
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In article <37D8E3BC.175DB72C@newtech.it>,
  Alex <busato@newtech.it> wrote:

>       type Status is (a,b,c,d,e);
>       pragma Discard_Names(Status);
>
>       for Status use
>        ( a => 0,
>          b => 20,
>          c => 400,
>          d => 800,
>          e => 1600);
>
>        S : Status;
> begin
>       S := b;
>       Put(" => " & S'img);
> end MainEnum;
>
> I've compiled it with Gnat (the latest version)
> the output of program is 1 but I was expecting another value : 20.
> Does  Gnat support this clause?

'img is not defined in Ada. It's a Gnat attribute. The Gnat RM I have
says this should be equivalent to Status'image(S), in which case I'd
expect to see you get a "b".

Generally I'd expect you to see that Status'image(S) = "b",
Status'pos(S) = 1, and To_Integer(S) = 20 (where To_Integer is an
instatiation of unchecked_conversion between Status and Integer).

--
T.E.D.


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