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Re: bug in eqv?
From: |
Kevin Ryde |
Subject: |
Re: bug in eqv? |
Date: |
Sat, 25 Mar 2006 08:56:43 +1100 |
User-agent: |
Gnus/5.110004 (No Gnus v0.4) Emacs/21.4 (gnu/linux) |
Aubrey Jaffer <address@hidden> writes:
>
> SRFI-77 is the most preliminary of proposals, and guaranteed to be
> withdrawn.
Yep. Seems to me the idea of base r5rs is reasonably clear (not
crystal clear, but near enough) that eqv? is the same as = on numbers.
Keeps the heirarchy of comparisons clean too.
> -- library procedure: equal? obj1 obj2
> `Equal?' recursively compares the contents of pairs, vectors, and
> strings, applying `eqv?' on other objects such as numbers and
> symbols. A rule of thumb is that objects are generally `equal?'
> if they print the same. `Equal?' may fail to terminate if its
> arguments are circular data structures.
>
> If -0.0 and 0.0 print differently, then there is no support for
> (equal? -0.0 0.0) ==> #t.
I would read it that equal? is supposed to be the same as eqv? on
numbers, and the bit about printing is only an aid to understanding
the recursion (and not a terribly helpful one really).