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From: "Randy Brukardt" <randy@rrsoftware.com>
Newsgroups: comp.lang.ada
Subject: Re: Interfacing with C ; an ununsed fields dilemma
Date: Fri, 3 Jul 2009 19:03:07 -0500
Organization: Jacob Sparre Andersen
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Date: 2009-07-03T19:03:07-05:00
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"Robert A Duff" <bobduff@shell01.TheWorld.com> wrote in message 
news:wccprcjrsek.fsf@shell01.TheWorld.com...
...
> The compiler cannot ALWAYS do block compare, for two reasons:
> Minus-zero equals plus-zero (for floats).

Also for integers, if you are on a one's complement machine. (Those 
generally are older machines, but some are still in use.)

...
> And user-defined "=" on
> the components gets called in the tagged case.

And soon to be all records (see AI05-0123-1, approved in Brest).

                          Randy.