From: Jon Bauman <jonrubyforum@...>
Date: 2006-04-14T00:14:15+09:00
Subject: Re: Range#size

Jeremy Tregunna wrote:
> On 13-Apr-06, at 9:20 AM, Meinrad Recheis wrote:
> 
>> does anyone object to adding the method :size to class Range?
> 
> Forgive me for being blunt, but Ranges don't have a fixed size, so
> how could you possibly measure it accurately? Force class
> implementers to implement not only a #succ method for their objects,
> but also a #range_size method which would give a formula for
> calculating the size? I mean seriously...

You know, it's not as though all range operations work with all range 
types anyway:

$ irb --simple-prompt
>> (1.0..2.0).each {|x| p x }
TypeError: can't iterate from Float
        from (irb):1:in `each'
        from (irb):1

So, what would be wrong with allowing size for object that implement the 
- operation and giving an error for those that don't?

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