--- extend_object(object)

    Object#extend [Object/extend] μΤǤ֥Ȥ
    ⥸塼εǽɲäޤObject#extend ϡRuby 
    񤯤ȰʲΤ褦Ǥޤ
        def extend(*modules)
          modules.each {|mod| mod.__send__ :extend_object, self }
        end

    extend_object ΥǥեȤμǤϡself 
    ᥽åɤ object ðۥ᥽åɤȤɲäޤ
    

    object ֤ޤ

