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From: Robert A Duff <bobduff@shell01.TheWorld.com>
Subject: Re: Reemergence of predefined equality operator...
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Vincent Marciante <marciant_remove@earthlink.net> writes:

> Only for limitted types (except for the trick that has been 
> mentioned occasionally) right?  By the way, can you describe 
> the trick or refer me to more info about it?

The trick is to have a generic formal limited private type,
and derive from that, and define "=" on the derived type.
Then instantiate with a non-limited type.

I believe this trick was first noticed by John Goodenough.

- Bob