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From: Philippe Torres <ptorres@laas.fr>
Subject: Re: use of attribute Pos
Date: 2000/10/12
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Ehud Lamm wrote:
> 
> Tucker Taft <stt@averstar.com> wrote in message
>  > Some attributes are type-related, and others are
> > subtype-specific.  'First and 'Last are subtype-specific,
> > whereas 'Pos, 'Image, (and all the attributes that are
> > functions) are type-related.
> >
> 
> To make things even more intersting for first time users of the language, an
> attribute can mean sometinhg different when applied to a TYPE and to
> VARIABLE.
> V'frist means something different than T'first (V=VAR, T=TYPE).
> 

I found a very useful reference card which sums up all the attributes
for subtypes, tasks, records, objects,... 
and to avoid confusions the 2 cases are separated :

(discriminated type or array)'First : Lower bound of first index of
[constrained] 				      				      array type

(subtype)'First : Lower bound of the range of scalar subtype

All in all, almost 100 attributes and/or using conditions are listed. I
guess they are very useful when you are accustomed to them but i'm in
quite a fight right now.

Thanks to all of you for your time and to pukite@diana.com for that
card.

Philippe