Weak Reference class that allows a referenced object to be garbage-collected.
A WeakRef may be used exactly like the object it references.
Usage:
foo = Object.new # create a new object instance p foo.to_s # original's class foo = WeakRef.new(foo) # reassign foo with WeakRef instance p foo.to_s # should be same class GC.start # start the garbage collector p foo.to_s # should raise exception (recycled)
Creates a weak reference to orig
Raises an ArgumentError if the given orig
is immutable, such
as Symbol, Integer, or Float.
# File weakref.rb, line 36 def initialize(orig) case orig when true, false, nil @delegate_sd_obj = orig else @@__map[self] = orig end super end