C++ virtual inheritance test

main.cpp

class A {
public:
    virtual ~A() = default;
    virtual void print()=0;
};

class B : public virtual A {
public:
    virtual ~B() = default;
    virtual void printB()=0;
    virtual void print()=0;
};

class C: public virtual A {
public:
    virtual ~C() = default;
    virtual void printC()=0;
};

class D : public B, public C {
public:
    void print() override {
        std::cout << "PRINT()\n";
    }
    void printB() override {
        std::cout << "PRINT'B'()\n";
    }
    void printC() override {
        std::cout << "PRINT'C'()\n";
    }
    D() {
        std::cout << "D 생성\n";
    }
    virtual ~D()=default;
};

void testA(std::shared_ptr<A> a) {
    std::shared_ptr<B> b;
    b = std::dynamic_pointer_cast<B>(a);
    b->printB();
}

int main() {
    auto d = std::make_shared<D>();
    testA(d);
    return 0;
}