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