多次继承下,最高层的子类的构造函数不需要写父类以上的构造函数
和虚拟继承不一样,虚拟继承需要些虚基类的构造函数。
虚拟继承构造函数写法:http://www.cnblogs.com/vhyc/p/5582450.html
class A{ protected: int a; public: A(int x) :a(x){ cout << "a" << endl; }; }; class B :public A { protected: int b; public: B(int x, int y) :A(x), b(y){ cout << "b" << endl; } }; class C :public B { private: int c; public: C(int x, int y, int z) :B(x, y), c(z){ cout << "c" << endl; }//和虚拟继承不一样,不能写A(x),否则编译就不过关 void display() { cout << a << endl << b << endl << c << endl; } }; int main() { C a(1, 2, 3); a.display(); }