From: Tom Hawkins <tom@launchbird.com>
To: caml-list@inria.fr
Subject: Re: [Caml-list] Invalid_argument("equal: abstract value")?
Date: Wed, 31 Dec 2003 16:21:51 -0600 [thread overview]
Message-ID: <200312311621.51555.tom@launchbird.com> (raw)
In-Reply-To: <200312311555.47555.tom@launchbird.com>
On Wednesday 31 December 2003 03:55 pm, Tom Hawkins wrote:
> I haven't seen this error before. Can someone provide an
> explanation?
>
> I've traced the problem down to a structural comparison (=) between
> two large data structures. I know functional comparisons are a
> no-no, but what is an "abstract value"?
>
> The problem occurred when I added big integers (Big_int.big_int) to
> the data structures under comparison. Suspecting big ints can't be
> structurally compared, I tried the following, but the compiler
> printed "false" as I would normally expect:
>
> let a = Big_int.zero_big_int = Big_int.unit_big_int in
> if a then print_string "true\n" else print_string "false\n";
Further suspecting Big_int.zero_big_int and Big_int.unit_big_int are
special cases, I tried:
Big_int.big_int_of_string "123" = Big_int.big_int_of_string "456"
Sure enough, 'Invalid_argument("equal: abstract value")'. So what's
the reasoning? (It's no big deal. I've already built a structural
comparison function for my problem as a work-around.)
-Tom
--
Tom Hawkins
Launchbird Design Systems, Inc.
952-200-3790
http://www.launchbird.com/
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next prev parent reply other threads:[~2003-12-31 22:26 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-12-31 21:55 Tom Hawkins
2003-12-31 22:21 ` Tom Hawkins [this message]
2004-01-01 3:10 ` skaller
2004-01-01 13:36 ` Damien Doligez
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