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From: "Matthew Heaney" <matthew_heaney@acm.org>
Subject: Re: Record comparison special case
Date: 1999/12/05
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In article <829bp3$oba$1@nnrp1.deja.com> , keniwasa@my-deja.com  wrote:

> I have a record made up of records in which only small parts (a few
> fields) are usually significant.
>
> The point is that I would like to compare two such records and determine
> whether the parts that both records consider to be significant are the
> same.  The easiest way I could see to handle this is to have an
> "insignificant" value in every enumeration and have some "insignificant"
> coding for real values, but that's not an option since the types cannot
> be modified.

What's wrong with simply redefining the equality operation of the record
type?

  type RT is tagged record ... end record;

  function "=" (L, R : RT) return Boolean;

Now you can implement "=" so that just the "small parts" of the L and R
records are compared.

--
Time and again the nation's courts have ruled that creationism, as a
religious dogma, cannot be taught in science classes. Now, creationists
are advancing a new tactic: eliminating the teaching of evolution and
other sciences that complement evolution, such as geology, paleontology,
and biological anthropology. By doing so, they are not only endangering
church-state separation but also seriously jeopardizing the science
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