C++派生类构造函数
实例
#include <iostream>
using namespace std;
class Base1 {//基类Base1，构造函数有参数
public:
Base1(int i) { cout << "Constructing Base1 " <<i<< endl; }
};
class Base2 {//基类Base2，构造函数有参数
public:
Base2(int j) { cout << "Constructing Base2 " <<j<< endl; }
};
class Base3 {//基类Base3，构造函数无参数
public:
Base3() { cout << "Constructing Base3 *" << endl; }
};
class Derived: public Base2, public Base1, public Base3 {
public:
Derived(int a, int b, int c, int d): Base1(a), Base2(b), member1(c), member2(d)//此处的次序与构造函数的执行次序无关
{}
private:
Base1 member1;
Base2 member2;
Base3 member3;
};
int main()
{
Derived obj(1,2,3,4);
return 0;
}
结果
Constructing Base2 2
Constructing Base1 1
Constructing Base3 *
Constructing Base1 3
Constructing Base2 4
Constructing Base3 *
根据继承顺序，先用接受到对应的值去初始化，调用基类的构造函数。然后按照子类成员声明顺序，调用相应的构造函数。