#include <iostream>
using namespace std;

struct C;
struct B;

class A{
    public:
    A(int r): type(r){}
    int type;
    void deleter();
    protected:
    ~A(){std::cout << "DTOR A" << std::endl;}
};

class B: public A{
    public:
    B():A(1){};
    ~B(){std::cout << "DTOR B" << std::endl;}
};

class C: public A{
    public:
    C():A(2){};
    ~C(){std::cout << "DTOR B" << std::endl;}
};

void A::deleter(){
     if(type==1){
        delete static_cast<B* const>(this);
    }else if(type==2){
        delete static_cast<C* const>(this);
    }
}

int main(){
      A * a = new B();
      a->deleter();
}