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C-/C++-Quelltext

class Type {
public:
    Integer* isInteger() {
        return nullptr;
    }
};

class Integer : public Type {
public:
    Integer* isInteger() {
        return this;
    }
};

// ...

if (Integer* i = obj->isInteger()) {
    // ...
}

C-/C++-Quelltext

// hpp
#pragma once

#include <utility>

typedef unsigned int Family;
extern Family familyIdIndex;

template <typename T>
Family family(){
    static Family family = familyIdIndex++;
    return family;
}

// cpp
#include "family.hpp"

Family familyIdIndex = 1;

// usage
class A{}
class B{}

family<A>(); // = 1
family<B>(); // = 2