From: Konrad Meyer <konrad@...>
Date: 2007-11-19T11:38:44+09:00
Subject: Re: Open-ended ranges?

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Quoth Todd Benson:
> On Nov 18, 2007 8:10 PM, Konrad Meyer <konrad@tylerc.org> wrote:
>=20
> >
> > irb(main):001:0> 0..(1.0/0)
> > =3D> 0..Infinity
> >
> > HTH,
> >
> > --
> > Konrad Meyer <konrad@tylerc.org> http://konrad.sobertillnoon.com/
>=20
> Right,
>=20
> (0..(1.0/0)).each { |o| puts "my_range includes " << o.to_s }
>=20
> It's not indeterminate, it's a definite infinity (within the
> computers' capabilities, of course).  There's a difference.  I suppose
> if you use a check within the loop, that might help the use case, but
> it still screams of language infidelity.
>=20
> Of course, I'm just assuming the OP wants 1 to some undetermined
> number as an object (a duck) that will quack yes at being asked if
> it's a Range.
>=20
> I'm still trying to figure out why you would want a Range object --
> which, by usual definition -- is a _not_ open-ended, have an infinite
> side.
>=20
> Todd

(0..(1.0/0)).each {  } will never complete though, because 0.succ is=20
eventually going to be a Bignum, while 1.0/0 is a float value Infinity. Sin=
ce=20
a bignum is always going to be less than Infinity, the block is=20
executed "forever". (Or at least until the bignum runs the machine out of=20
ram.)

Regards,
=2D-=20
Konrad Meyer <konrad@tylerc.org> http://konrad.sobertillnoon.com/

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