Is there a way to mark a class as "not copyable"?

In Boost.Python you can mark classes with boost::noncopyable, which will suppress any attempts at creating copies of objects of that class. Is there similar functionality in Pybindgen? I'm trying to wrap a class that has a public parameter-less constructor but a protected copy constructor and a protected assignment operator. Pybindgen complains that

Class '...' has a protected constructor and no helper class -> cannot generate a constructor for it

even though only the copy constructor is protected.