From: Dave Burt <dave@...>
Date: 2004-11-10T17:18:32+09:00
Subject: When is a key not a key?

Hi,

I hesitate to write because some of my code here is pretty evil, but this 
problem is weirding me out a bit.

I have a hash (loan_shark) indexed by instances of a particular struct 
(Player).

The hash seems to be failing to find its keys when I try to look them up. 
Like this:

loan_shark.size  #=> 4
loan_shark.has_key?(loan_shark.keys[0])  #=> false

Any ideas?

The background is something like this:

 Player = Struct.new(:name, :bankroll, :hands)
....
  loan_shark = {}
....
      newb = Player.new("Fred", some_dollars)
....
      loan_shark[newb] = some_dollars
....
      players << newb

If you feel the need, you can get all the code (about 15k) here:
http://www.dave.burt.id.au/ruby/blackjack.rb
http://www.dave.burt.id.au/ruby/cards.rb
(The issue can be found near blackjack.rb:304, complete with futile 
debugging code)

Cheers,
Dave