From: Florian Frank <flori@...>
Date: 2004-10-05T22:10:12+09:00
Subject: Re: [RCR] New [] Semantics


On 05.10.2004, at 13:20, Brian Candler wrote:
> I agree, although it's really only an optimisation, because other 
> cases will
> still give an infinite loop: in particular
>
>       i = 1.0/0
>       (2..i).member?(1)
>
> So you have a halting problem instead :-)

True. At least it would behave like the documentation describes it.

>
> Or fixing it, but I'd also be happy to see it fall back to Enumerable, 
> as
> there's not much efficiency gain in implementing basically the same 
> thing a
> second time within range.c

Hmm, i just got another idea, how it would be able to always return 
true or false
for non-Float ranges:

def member?(x)
   include?(x) and 
Enumerable.instance_method(:member?).bind(self).call(x)
end

Florian Frank