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From: =?ISO-8859-1?Q?Markus_Sch=F6pflin?= <no.spam@spam.spam>
Newsgroups: comp.lang.ada
Subject: Re: Validity of renamed objects?
Date: Tue, 01 Apr 2014 15:55:15 +0200
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Date: 2014-04-01T15:55:15+02:00
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Am 01.04.2014 15:04, schrieb Jacob Sparre Andersen:

> I've been reading section 8.5.1 in the LRM, and I can't figure out when
> the compiler is supposed to check the validity of a renamed object.
>
> An example:
>
> procedure Renaming_1 is
>     Object  : String (1 .. 9) := "dead beef";
>     Index   : Natural := 0;
>     Renamed : Character renames Object (Index);
> begin
>     Index := (Object'First + Object'Last) / 2;
>     if Renamed /= ' ' then
>        raise Program_Error
>          with "Expected Renamed to match the changed value of Index.";
>     end if;
> end Renaming_1;
>
> 1) Should I get a Constraint_Error when Renamed is declared?

Yes, see 8.5(3).

"Object (Index)" is evaluated when the renaming declaration is elaborated.

Markus