c ++如何调用B和A Methodes？

Question

我想打印（见下文）而不添加任何其他变量或对象......我该怎么做？非常感谢... B :: p r i n A :: druck A :: p r i n t

#include <iostream>
using namespace std;
class A {
public:
    void print() { cout << "A: : p r i n t " << endl; }
    void druck() { cout << "A: : druck " << endl; }
};
class B : public A {
public:
    void print() { cout << "B: : p r i n t " << endl; }
    void druck() { cout << "B: : druck " << endl; }
};
int main() {
    A * a = new B();

    getchar();
    return 0;
}

Answer 1

只需通过B拨打static_cast，例如：

a->print();
static_cast<B*>(a)->print();