From: ara.t.howard@...
Date: 2006-08-04T04:48:44+09:00
Subject: Re: Next Major Version (was Re: Different semantics of Proc and method call -- bug or feature?)

On Fri, 4 Aug 2006, Rick DeNatale wrote:

>>  >> "1.8.5" < "1.10.0"
>> => false
>
> Ah, but doing the comparison correctly in Ruby isn't that hard,  in a
> few minutes I came up with:
>
> irb(main):023:0> class Version
> irb(main):024:1>    include Comparable
> irb(main):025:1>
> irb(main):026:1*    def initialize(string)
> irb(main):027:2>        @value = string.split('.').collect { | i | i.to_i }
> irb(main):028:2>    end
> irb(main):029:1>
> irb(main):030:1*    def <=>(another)
> irb(main):031:2>        @value <=> another.to_ary
> irb(main):032:2>    end
> irb(main):033:1>
> irb(main):034:1*    def to_ary
> irb(main):035:2>        @value
> irb(main):036:2>    end
> irb(main):037:1> end
> => nil
> irb(main):038:0> Version.new("1.8.5")
> => #<Version:0xb7d728e8 @value=[1, 8, 5]>
> irb(main):039:0> Version.new("1.8.5") < Version.new("1.10.0")
> => true
>
> I'd strongly suggest, that it's much better for Ruby if it tries to
> stay in line as much as possible with how things are done in the open
> source community.
>
> There's a lot of software outside of Ruby which depends on having
> versions being a tuple of numbers.  Since Ruby makes it easy to meet
> things like that more than halfway, I think that it's better to do so.

but this isn't correct by 'open source' standards

   http://codeforpeople.com/lib/ruby/library/library-0.0.0/doc/
   http://sources.redhat.com/autobook/autobook/autobook_91.html

in order to compare you have to consider the semantics of each positional
number


-a
-- 
we can never obtain peace in the outer world until we make peace with
ourselves.
- h.h. the 14th dali lama