Unique class type Id that is safe and holds across library boundaries

Question

I would appreciate any help as C++ is not my primary language.

I have a template class that is derived in multiple libraries. I am trying to figure out a way to uniq

Answer 1

#include 
#include 

#define DEFINE_CLASS(class_name) \
    class class_name { \
    public: \
        virtual uint32_t getID() { return hash(#class_name); } \

// djb2 hashing algorithm
uint32_t hash(const char *str)
{
    unsigned long hash = 5381;
    int c;

    while ((c = *str++))
        hash = ((hash << 5) + hash) + c; /* hash * 33 + c */

    return hash;
}

DEFINE_CLASS(parentClass)

    parentClass() {};
    ~parentClass() {};
};

DEFINE_CLASS(derivedClass : public parentClass)

    derivedClass() : parentClass() {};
    ~derivedClass() {};
};

int main() {
    parentClass parent;
    derivedClass derived;
    printf("parent id: %x\nderived id: %x\n", parent.getID(), derived.getID());
}