Non-delegate WeakRef implementation

gistfile1.diff

diff --git a/lib/weakref.rb b/lib/weakref.rb
index 78f88a3..7129873 100644
--- a/lib/weakref.rb
+++ b/lib/weakref.rb
@@ -54,6 +54,37 @@ class WeakRef < Delegator
   end
 end
 
+module GC
+  
+  # New WeakRef that is not a delegate.
+  # The referenced object can be retrieved with
+  # +get+ and the reference can be cleared with
+  # +clear+, but otherwise no modification is
+  # supported.
+  class WeakRef
+    @@__map = ::ObjectSpace::WeakMap.new
+  
+    ##
+    # Creates a weak reference to +orig+
+  
+    def initialize(orig)
+      @@__map[self] = orig
+    end
+  
+    ##
+    # Get the object referenced by this WeakRef. If the
+    # object has been collected, this will return nil.
+    
+    def get # :nodoc:
+      @@__map[self]
+    end
+    
+    def clear
+      @@__map[self] = nil
+    end
+  end
+end
+
 if __FILE__ == $0
 #  require 'thread'
   foo = Object.new