[cdr-discuss] AEQUALIS and COMPARE

[Pascal Costanza]

Hi,

Just a few quick comments:

- The name AEQUALIS seems very weird to me. ;)

- The idea that COMPARE returns symbols also seems weird to me. Wouldn't it be better to return numbers (-1, 0, +1 or NIL)? Can't immediately tell why, though.

- Shouldn't there also be a hash-code generic function that can be specialized alongside AEQUALIS? This also exists in Java and C#, and could make this immediately more useful (and would be much harder to add later as an afterthought). Many CL implementation add an :sxhash option to make-hash-table, where such a hash-code function could be used.


Best,
Pascal

On 15 Feb 2011, at 08:04, Marco Antoniotti wrote:

> Good morning.
> 
> here is a proposal to introduce generic equality and comparisons in CL.  The proposal is minimal and it is in the spirit of Java and C# equality facilities.  The names are not fixed in stone.
> 
> Please let's discuss it in this spirit.  I am well aware of KMP's considerations on the subject and of other issues as well.
> 
> 
> <cleqcmp.pdf>
> <cleqcmp.html>
> 
> --
> Marco Antoniotti
> 
> 
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-- 
Pascal Costanza, mailto:pc at p-cos.net, http://p-cos.net
Vrije Universiteit Brussel
Software Languages Lab
Pleinlaan 2, B-1050 Brussel, Belgium