“type-switch” construct in C++11

Question

All the time, I find myself doing something like this:

Animal *animal = ...
if (Cat *cat = dynamic_cast(animal)) {
    ...
}
else if (Dog *dog =         


        

Answer 1

I think it depends if you want do this at compile time or at run time. For compile time, Verdagon's answer is better, at runtime you can do something like this

class A {
};

class B {
};

void doForA() {
    std::cout << "I'm A" << std::endl;
}

void doForB() {
    std::cout << "I'm B" << std::endl;
}

int main() {
    std::unordered_map> mytypes;
    mytypes[typeid(A)] = doForA;
    mytypes[typeid(B)] = doForB;

    mytypes[typeid(A)]();
}

but both ways are wrong the virtual keyword is here for this, you MUST do like Arie said or there is mistake in your architecture