C++构造函数按下列顺序被调用：
(1)任何虚拟基类的构造函数按照它们被继承的顺序构造；
(2)任何非虚拟基类的构造函数按照它们被继承的顺序构造；
(3)任何成员对象的构造函数按照它们声明的顺序调用；
(4)类自己的构造函数。
#include <iostream> using namespace std; class OBJ1 { public: OBJ1(){ cout <<"OBJ1\n"; } }; class OBJ2 { public: OBJ2(){ cout <<"OBJ2\n"; } }; class Base1 { public: Base1(){ cout <<"Base1\n"; } }; class Base2 { public: Base2(){ cout <<"Base2\n"; } }; class Base3 { public: Base3(){ cout <<"Base3\n"; } }; class Base4 { public: Base4(){ cout <<"Base4\n"; } }; class Derived :public Base1, virtual public Base2, public Base3, virtual public Base4 { public: Derived() :Base4(), Base3(), Base2(), Base1(), obj2(), obj1() { cout <<"Derived ok.\n"; } protected: OBJ1 obj1; OBJ2 obj2; }; int main() { Derived aa; cout <<"This is ok.\n"; int i; cin >> i; return 0; } |
结果：
Base2
Base4
Base1
Base3
OBJ1
OBJ2
Derived ok.
This is ok.
