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From: "Martin Dowie" <martin.dowie@baesystems.com>
Newsgroups: comp.lang.ada
References: 
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Subject: Re: RISC
Date: Tue, 20 Mar 2001 18:10:50 -0000
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> That's why if the object is largish I typically use unchecked_conversion
on
> pointers to the object instead. Depending on the smarts of the compiler,
that
> might not generate any code at all.

Do you then use 'Valid?