Extended maintenance of Ruby versions 1.8.7 and 1.9.2 ended on July 31, 2014. Read more
BasicObject
The primary interface to this library. Use to setup delegation when defining your class.
class MyClass < DelegateClass( ClassToDelegateTo ) # Step 1 def initialize super(obj_of_ClassToDelegateTo) # Step 2 end end
# File delegate.rb, line 258 def DelegateClass(superclass) klass = Class.new methods = superclass.public_instance_methods(true) methods -= ::Kernel.public_instance_methods(false) methods |= ["to_s","to_a","inspect","==","=~","==="] klass.module_eval { def initialize(obj) # :nodoc: @_dc_obj = obj end def method_missing(m, *args, &block) # :nodoc: unless @_dc_obj.respond_to?(m) super(m, *args, &block) end @_dc_obj.__send__(m, *args, &block) end def respond_to?(m, include_private = false) # :nodoc: return true if super return @_dc_obj.respond_to?(m, include_private) end def __getobj__ # :nodoc: @_dc_obj end def __setobj__(obj) # :nodoc: raise ArgumentError, "cannot delegate to self" if self.equal?(obj) @_dc_obj = obj end def clone # :nodoc: new = super new.__setobj__(__getobj__.clone) new end def dup # :nodoc: new = super new.__setobj__(__getobj__.clone) new end } for method in methods begin klass.module_eval <<-EOS, __FILE__, __LINE__+1 def #{method}(*args, &block) begin @_dc_obj.__send__(:#{method}, *args, &block) ensure $@.delete_if{|s| ::Delegator::IgnoreBacktracePat =~ s} if $@ end end EOS rescue SyntaxError raise NameError, "invalid identifier %s" % method, caller(3) end end return klass end