Check if class is derived from a specific class (compile, runtime both answers available)

Question

It is easier to explain on an example so,

class base {
//....
}

class derived1 : public base {
//...
}

In my library, there is a pointer o

Answer 1

You could use dynamic_cast.

if (dynamic_cast(ptr)) {
    std::cout << "Class is derived from DerivedClass.";
}