constructor.cpp

#include <cstdio>

class A {
public:
    A() = default;

    static void OverridableInit() {
        std::printf("I am in A\n");
    }

protected:
    template <typename T>
    A(T* this_) {
        T::OverridableInit();
    }
};

class B : public A {
public:
    B() : A(this) {}

    static void OverridableInit() {
        std::printf("I am in B\n");
    }

protected:
    template <typename T>
    B(T* this_) : A(this_) {}
};

class C : public B {
public:
    C() : B(this) {}

    static void OverridableInit() {
        std::printf("I am in C\n");
    }

protected:
    template <typename T>
    C(T* this_) : B(this_) {}
};

int main() {
    C c{};
}