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From: Jeffrey Carter <jeffrey.carter@boeing.com>
Subject: Re: Static assertions
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Date: 2001-05-17T22:34:31+00:00
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Marin David Condic wrote:
> 
> You have to be careful of the declarations. Just because you maybe did
> something to declare (for example) a 16 bit integer type, doesn't mean that
> 'Size for the type won't end up as 32. Even if you use a rep clause, the
> compiler doesn't have to honor it - although one would hope it was at least
> polite enough to inform you of that fact.
> 
> Perhaps you could post the code you created to test it?

The code was identical to that posted by JPR, except that 32 was changed
to 16, and 4 was changed to 8. This makes both expressions False (for
me, but I would hope at least one of them would be False on every
system). The test program simply used Integer'Image and Put_Line to
output the values of the 2 constants.

> 
> MDC
> --
> Marin David Condic
> Senior Software Engineer
> Pace Micro Technology Americas    www.pacemicro.com
> Enabling the digital revolution
> e-Mail:    marin.condic@pacemicro.com
> Web:      http://www.mcondic.com/
> 
> "Jeffrey Carter" <jeffrey.carter@boeing.com> wrote in message
> news:3B040DE4.468E779F@boeing.com...
> > Jean-Pierre Rosen wrote:
> > >
> > > package Verifier is
> > >    subtype Assert is Boolean range True..True;
> > >
> > >    Assert_1 : constant := Boolean'Pos( Assert (Integer'Size=32) );
> > >    Assert_2 : constant := Boolean'Pos( Assert
> > > (Integer'Size=4*Character'Size) );
> > > end Verifier;
> > >
> > > (The Boolean'Pos serves to have a value used in a named number
> declaration,
> > > which requires a static context).
> >
> > Interesting. However, Rational Apex 2.4.6 on HP compiles this fine even
> > if the declarations are changed to make the expressions false. A test
> > program to output the values of Assert_X produces 2 zeros.
> >
> > If I change the declarations to
> >
> > Assert_1 : constant Assert := Integer'Size = 73;
> >
> > then the unit will not compile.
> >
> > --
> > Jeffrey Carter


-- 
Jeffrey Carter