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From: Jeffrey Carter <jeffrey.carter@boeing.com>
Subject: Re: Static assertions
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Date: 2001-05-17T17:44:04+00:00
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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