How to assert that a particular class does not have any vtbl pointers in its layout?

Question

I have a simple RAII class to ensure some handle is properly disposed of. Now I would like to assert that no one is going to add by accident any virtual methods to it. The way I see it, I need to assert that the class does not have the vtbl pointer.

How can I do it? Is it possible to assert at the compile time?

EDIT

I will settle for desktop compilers. As far as I know there are no desktop c++ compilers that are not using vtbl for implementing polymorphism.

Answer 1

If you have a C++11 library, you can use std::is_polymorphic<T>:

If T is a polymorphic class (that is, a class that declares or inherits at least one virtual function), provides the member constant value equal true. For any other type, value is false.