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Subject: Re: Ada 2012 Constraints (WRT an Ada IR)
From: AdaMagica <christ-usch.grein@t-online.de>
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Xref: news.eternal-september.org comp.lang.ada:32545
Date: 2016-12-01T02:33:10-08:00
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Am Dienstag, 29. November 2016 18:53:59 UTC+1 schrieb Niklas Holsti:
> > Subtype P2 is Integer
> >     with Static_Predicate => P2 in 1..Integer'Last
> >                           or else raise Constraint_Error;
> 
> Perhaps it was obvious to you, but this differs from Positive in that 
> you cannot write P2'First or similar (illegal by RM 3.2.4(26/3)), but 
> you can write Positive'First.

'First, 'Last, 'Range are disallowed. There are 'First_Valid and 'Last_Valid instead. RM 5.5(7.2/4-7.3/4)