c++ 派生类的构造函数次序

#include <iostream>

using namespace std;

class CFatherSum         //父类Sum

{

public:

    CFatherSum(int iRec){cout<<"1,Constructing CFatherSum"<<iRec<<endl;}//构造函数成员初始化

};

class CFatherBru        //父类Bru

{

public:

    CFatherBru(int iRec){cout<<"2,Constructing CFatherBru"<<iRec<<endl;}//构造函数成员初始化

};

class CFatherObam         //父类Obam

{

public:

    //第一行用于对比默认构造

    //CFatherObam(int iRec){cout<<"3,Constructing CFatherObam"<<iRec<<endl;}//构造函数成员初始化

    CFatherObam(){cout<<"3,Constructing CFatherObam*"<<endl;}//构造函数成员初始化

};

class CSon:public CFatherSum,public CFatherBru,public CFatherObam      //继承父Sum,Bru,Obam

{

public:

    CSon(int iFirst,int iSec,int iThir,int iFor):CFatherSum(iFirst),m_bru(iFor),m_sum(iThir),CFatherBru(iSec)

    {

        //CFatherObam(iFor),m_obam(iFor)        非默认构造时，须派生构造传递构造参数

    }

private:

    CFatherSum m_sum;

    CFatherBru m_bru;

    CFatherObam m_obam;

};

//主函数

int main()

{

    CSon son(,,,);

    getchar();

    return ;

}

结果：

结果分析：

构造参数次序先后如下：

1，派生类定义基类的顺序：从public CFatherSum到public CFatherBru到public CFatherObam

2，派生类内成员在类中声明的顺序：

CFatherSum m_sum;
CFatherBru m_bru;
CFatherObam m_obam;

延伸:析构函数次序相反，试验自行增加代码