方法返回一个ParentClass对象，该对象可以是两种ChildClass类型之一。如何公开ChildClass属性？

class ParentClass {
public:
    virtual std::string getChildClassProperty() {
        return "ParentClass";
    }
};

class ChildClass1 : public ParentClass {
public:
    std::string getChildClassProperty() override {
        return "ChildClass1";
    }
};

class ChildClass2 : public ParentClass {
public:
    std::string getChildClassProperty() override {
        return "ChildClass2";
    }
};

int main() {
    ParentClass* obj1 = new ChildClass1();
    ParentClass* obj2 = new ChildClass2();

    std::cout << obj1->getChildClassProperty() << std::endl;  // 输出 ChildClass1
    std::cout << obj2->getChildClassProperty() << std::endl;  // 输出 ChildClass2

    delete obj1;
    delete obj2;

    return 0;
}

class ParentClass {
public:
    std::string parentProperty;
};

class ChildClass1 : public ParentClass {
public:
    std::string childProperty1;
};

class ChildClass2 : public ParentClass {
public:
    std::string childProperty2;
};

int main() {
    ParentClass* obj = new ChildClass1();
    ChildClass1* childObj1 = dynamic_cast<ChildClass1*>(obj);
    ChildClass2* childObj2 = dynamic_cast<ChildClass2*>(obj);

    if (childObj1 != nullptr) {
        childObj1->childProperty1 = "ChildClass1 Property";
        std::cout << childObj1->childProperty1 << std::endl;  // 输出 ChildClass1 Property
    }

    if (childObj2 != nullptr) {
        childObj2->childProperty2 = "ChildClass2 Property";
        std::cout << childObj2->childProperty2 << std::endl;  // 不会执行，因为obj实际上是ChildClass1类型的对象
    }

    delete obj;

    return 0;
}