From: ts <decoux@...>
Date: 2003-08-28T19:47:38+09:00
Subject: Re: Another Ruby-powered site

>>>>> "T" == Thomas Hurst <tom.hurst@clara.net> writes:

T>   class WeakRefHash < Hash

 Try something like this (this is just an example)

svg% cat b.rb
#!/usr/bin/ruby
class WeakRefHash < Hash
   def final(a)
      lambda { delete(a) }
   end

   def []=(key, value)
      ObjectSpace.define_finalizer(value, final(key))
      super(key, value.id)
   end
end

def a(h, k)
   h[k] = []
end

h = WeakRefHash.new('default')
3.times {|i| a(h, i)}
GC.start
3.times {|i| p h[i]}

svg%
 
svg% b.rb
"default"
"default"
"default"
svg% 


Guy Decoux