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# Delegation class that delegates even methods defined in super class,
# which can not be covered with normal method_missing hack.
#
# Delegater is the abstract delegation class. Need to redefine
# `__getobj__' method in the subclass. SimpleDelegater is the
# concrete subclass for simple delegation.
#
# Usage:
# foo = Object.new
# foo = SimpleDelegater.new(foo)
# foo.type # => Object
class Delegater
def initialize(obj)
preserved = ["id", "equal?", "__getobj__"]
for t in self.type.ancestors
preserved |= t.instance_methods
break if t == Delegater
end
for method in obj.methods
next if preserved.include? method
eval "def self.#{method}(*args); __getobj__.send :#{method}, *args; end"
end
end
def __getobj__
raise NotImplementError, "need to define `__getobj__'"
end
end
class SimpleDelegater<Delegater
def initialize(obj)
super
@obj = obj
end
def __getobj__
@obj
end
end
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