From: nobu.nokada@...
Date: 2003-03-22T04:40:22+09:00
Subject: Re: infinite Time

Hi,

At Sat, 22 Mar 2003 03:44:31 +0900,
ahoward wrote:
> 
> On Sat, 22 Mar 2003 nobu.nokada@softhome.net wrote:
> 
> > class Time
> >   NEGATIVE_INFINITY = -1.0 / 0
> >   INFINITY = 1.0 / 0
> >   EPOCH = 0
> > end
> 
> looks promising.  however, can anyone explain why this approach to
> implementing the comparisions does not work?????

You need to coerce.

  class Time
    def coerce(x)
      case x
      when Float
        return [x, to_f]
      when Integer
        return [x, to_i]
      else
        super
      end
    end

    INF   = INFINITY          =  1.0 / 0
    NINF  = NEGATIVE_INFINITY = -1.0 / 0
    EPOCH = Time.at(0)
  end

> i am unclear as to why
> 
>   class << object
>     include Comparable
>     def <=> ...
>   end
> 
> does NOT, in this case, seem to redefine the '>' operator.

Float#> doesn't call <=> due to performance.

-- 
Nobu Nakada