From: Logan Capaldo <logancapaldo@...>
Date: 2006-08-09T21:22:39+09:00
Subject: Re: why doesn't Array include Comparable


On Aug 9, 2006, at 12:56 AM, Hal Fulton wrote:

> ara.t.howard@noaa.gov wrote:
>> why __wouldn't__ one want this?
>>   harp:~ > cat a.rb
>>   a = 0,1,2
>>   b = 2,3,4
>>   p a < b rescue puts "can't do that!"
>>   class Array; include Comparable; end
>>   p a < b
>>   harp:~ > ruby a.rb
>>   can't do that!
>>   true
>> ??
>
> Offhand I would guess it's because arrays can
> hold arbitrary objects.
>
> If one array held four different classes of
> objects, and another held yet another four
> classes of objects, that's potentially sixteen
> spaceship operators that would need to be
> defined for this to make sense. And most of
> those would not make sense anyway.
>

But spaceship is already defined for array (and it does the right  
thing (tm)). If Array is going to make spaceship available, why _not_  
include Comparable?

>
> Hal
>