继承以及构造函数初始化顺序
继承了父类，就一定要调用父类的构造函数
构造函数的执行顺序和析构函数的执行顺序刚好完全相反
#include "stdafx.h"
#include <iostream>
#include <time.h>
using namespace std;
class B1
{
public:
B1(int i)
{
cout << "constructing B1 " << i << endl;
}
~B1()
{
cout << "destructing B1" << endl;
}
};
class B2
{
public:
B2(int j)
{
cout << "constructing B2 " << j << endl;
}
~B2()
{
cout << "destructing B2" << endl;
}
};
class B3
{
public:
B3()
{
cout << "constructing B3" << endl;
}
~B3()
{
cout << "destructing B3" << endl;
}
};
class C : public B2, public B1, public B3 //这个才是调用构造函数的顺序
{
private:
B1 memberB1;
B2 memberB2;
B3 memberB3;
public:
C(int a, int b, int c, int d) :B1(a), memberB2(d), memberB1(c), B2(b), B3() //自身的构造函数也依据上面
{
}
};
int main(int argc, _TCHAR* argv[])
{
C obj(1, 2,3,4);
return 0;
}
输出结果：
