From: Neil Spring <nspring@...>
Date: 2004-01-13T08:54:15+09:00
Subject: IPAddr as hashtable key?

I'm wondering if the methods required for using IPAddrs as
keys in a Hash would be useful.

I made the mistake (oops) of maintaining a dns name cache
keyed on IPAddrs.  I've fixed my problem, but I think the
following methods should be added to ipaddr.rb.

  class IPAddr
    def hash
        @addr
    end
    alias eql? ==
  end

thoughts?  Is this feature missing for a reason I don't see?
example code follows.

thanks,
-neil



skyo:~> cat myipaddr.rb

require 'ipaddr'
class IPAddr
    def hash
        @addr
    end
    alias eql? ==
end


skyo:~> ruby1.8 -r ipaddr -e 'puts IPAddr.new("10.0.0.1").eql?(IPAddr.new("10.0.0.1"))'
false

skyo:~> ruby1.8 -I . -r myipaddr -e 'puts IPAddr.new("10.0.0.1").eql?(IPAddr.new("10.0.0.1"))'
true

skyo:~> ruby1.8 -r ipaddr -e 'puts IPAddr.new("10.0.0.1").hash, IPAddr.new("10.0.0.1").hash'
537145508
537145438

skyo:~> ruby1.8 -I . -r myipaddr -e 'puts IPAddr.new("10.0.0.1").hash, IPAddr.new("10.0.0.1").hash'
167772161
167772161

skyo:~> ruby1.8 -r ipaddr -e 'a=IPAddr.new("10.0.0.1"); foo = { a => true }; puts foo[IPAddr.new("10.0.0.1")]'
nil

skyo:~> ruby1.8 -I . -r myipaddr -e 'a=IPAddr.new("10.0.0.1"); foo = { a => true }; puts foo[IPAddr.new("10.0.0.1")]'
true