构造函数调用顺序

原创于 2015-03-25 09:13:14 发布 · 432 阅读

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本文介绍了一个使用C++实现的包含多重继承的示例程序。该程序定义了两个基类Base1和Base2，它们各自继承自Base，并且都使用了虚拟继承。派生类Derived继承自Base1和Base2，同时直接继承自Base。构造函数的调用顺序展示了多重继承中构造函数的执行流程。

#include<iostream>
using namespace std;
class Base
{
public:
    Base(int i) {cout<<i; cout<<"Base调用"<<endl;}
};

class Base1:virtual public Base
{
public:
    Base1(int i,int j=0):Base(j){cout<<i; cout<<"Base1调用"<<endl;}
    ~Base1(){}
};

class Base2:virtual public Base
{
public:
    Base2(int i,int j=0):Base(j) {cout<<i; cout<<"Base2调用"<<endl;}
    ~Base2()  {}   
};

class Derived:public Base2,public Base1
{
public:
    Derived(int a,int b,int c,int d):mem1(a),mem2(b),Base1(c),Base2(d),Base(a)
    {cout<<b; cout<<"Derived调用"<<endl;}

private:
    Base2 mem2;
    Base1 mem1;
};

void main()
{
     Derived objD(1,2,3,4);
     cout<<endl;
}