How to generate a compiler warning/error when object sliced

Question

I want to know if it is possible to let compiler issue a warning/error for code as following:

Note:

1. Yea, it is bad programming style and

Answer 1

class Derived: public Base{};

You're saying Derived IS a Base, and so it should work in any function that takes a base. If this is a real problem, maybe inheritance isn't what you really want to be using.