C++ 多重继承示例：虚拟继承和成员访问

#include using namespace std;

class A { protected: int a; public: A() { a = 1; cout << 'Initializing A.' << endl; } };

class D1: virtual public A { public: D1() { a = a + 1; } };

class D2: virtual public A { public: D2() { a = a + 3; } };

class B: public D1, public D2 { public: B() {} void show() { cout << 'a = ' << a << endl; } };

int main() { B b; b.show(); return 0; }