Can I prevent implicit conversions of a derived class to a base class? [duplicate]

This question already has an answer here:

• Idiomatic way to prevent slicing? 3 answers

If I have eg:

class Base {}; 
class Derived : public Base {};

And a function:

Derived create_derived();

I'd like this to be ill-formed:

Base base = create_derived();

How can I do this?