def create_class type eval class type BasicType providers ProviderArra

def create_class(type)
  eval "
    class #{type} < BasicType
      @providers=ProviderArray.new   #   you need this assignment in each inherited class
    end
  "
end


create_class("UserName")
create_class("UniqueUserName")
create_class("TrafficLimit")
create_class("UniqueTrafficLimit")