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From: Matthew Heaney <matthew_heaney@acm.org>
Subject: Re: Naming of Tagged Types and Associated Packages
Date: 1998/09/16
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NNTP-Posting-Date: Wed, 16 Sep 1998 08:42:08 PDT
Newsgroups: comp.lang.ada
Date: 1998-09-16T00:00:00+00:00
List-Id: <comp.lang.ada>

"John G. Volan" <johnvolan@sprintmail.com> writes:

> class JOHN_VOLAN_SIGNATURE inherit SIGNATURE invariant
>    disclaimer: not (opinion implies employer.opinion)
> end -- class JOHN_VOLAN_SIGNATURE

That Ada doesn't have an implication operator is a real bummer.  It
makes it difficult to state a postcondition:

not (opinion implies employer.opinion) =
not (not opinion or employer.opinion) =
opinion and not employer.opinion

I would say the form using implication is more clear, eh?