From: jmay <jason.may@...>
Date: 2007-03-21T04:00:23+09:00
Subject: Defining my own class of unique objects

Hi-

I'm trying to define a class with semantics similar to Fixnum, where
every object is unique.  Each object has some internal state, more
complex that a single numeric value.  Also, I want this to work across
marshalling and YAML.load.  Semantics like this:

Foo.new("stuff").object_id == Foo.new("stuff").object_id
Foo.new("stuff").object_id ==
YAML.load(Foo.new("stuff").to_yaml).object_id

I looked at Memoize, but this just memoizes results of method calls on
instances, I couldn't figure out how to memoize #new.

I'm stumped.  Any suggestions?

Thanks,
-Jason