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From: "Mark Lundquist" <mlundquist2@attbi.com>
Newsgroups: comp.lang.ada
References: <3C0DB9D0.7184868A@acm.org>
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Subject: Re: List Strawman JC01
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"Ted Dennison" <dennison@telepath.com> wrote in message
news:rk8Q7.53164$xS6.87831@www.newsranger.com...
> In article <uk7vzudrz.fsf@gsfc.nasa.gov>, Stephen Leake says...
> >
> >I don't think "Front" and "Back" are significantly more
> >"directionless" than "First" and "Last". "A" and "B" would be more
> >directionless, although even those have an alphabetical order.
>
> I thought a lot about this, and I couldn't really come up with anything
more
> neutral. "A" and "B" (or "A" and "Z") do imply an order (alphabetical).
"First"
> and "Last" obviously do too for the same reason. Even "Left" and "Right"
imply
> an order (reading order). That order is different for some people than it
is for
> others, but each individual reader will have a specific order it implies
to
> them.
>
[snip]
> you can find the ends, and we do have to arbitrarily label each
> end *something*. We just have to find nice linear but direction-neutral
> somethings to name them.

Why don't you name it after the cartoon character CatDog, who has the heads
of a Cat and a Dog on either end?

    function Cat (List : Lists.List) return Iterator;
    function Dog (List : Lists.List) return Iterator;

    type Direction is (Catward, Dogward);

Picture a CatDog, rotating slowly in empty space.  How can you tell which
end is the Cat and which end is the Dog?  The point is, *you*can*.

:-) :-) :-)
-- mark