What is C++11's equivalent of Java's instanceof

Question

I want to know what the modern C++11 equivalent of Java's instanceof. I have seen this SO post but it is quite old and was wondering if there's a more modern, better solution in C++11?

I was hoping there's a possibility of using a switch construct without having to resort to a manual enum class.

class A {

};

class B : public A {

}

class C : public A {

}

on_event(A& obj)
{
    switch (obj) {
       case A:
       case B:
       case C:
    }
}

My base class does not have any virtual methods or functions. I am representing an expression tree for a parser and the base class is just a polymorphic holder - like an ADT in Haskell/OCaml.

Answer 1

The same answer still applies, and has always been like this in C++:

if (C * p = dynamic_cast<C *>(&obj))
{
    // The type of obj is or is derived from C
}
else
{
    // obj is not a C
}

This construction requires A to be polymorphic, i.e. to have virtual member functions.

Also note that this behaviour is different from comparing typeid(obj) == typeid(C), since the latter tests for exact type identity, whereas the dynamic cast, as well as Java's instanceof, only test for the target type to be a base class of the type of the most-derived object.