c++—虚基类

#include <iostream> 
using namespace std;
class Base //虚基类Base
{
protected:
int val; 
public:
Base(int a) //构造函数
{ 
val=a;
cout<<"initiling obiect\n";
}
void Print() //输出成员val值得函数
{ 
cout<<val<<endl;
}
void get()
{
cout<<val;
}
void set(int y)
{
val=y;
}
//成员变量val
};
class Derived1:virtual public Base //第一个派生类Derived1
{
protected:
int dv1;
public:
Derived1(int x,int y):Base(x),dv1(y) //调用了基类的构造函数
{
}
};
class Derived2:virtual public Base
{
protected:
int dv2;
public:
Derived2(int x,int y):Base(x),dv2(y) //调用了基类的构造函数
{
}
};
//最终的多重继承类DerivedFinal
class DerivedFinal:public Derived1,public Derived2
{
protected:
int val;
public:
DerivedFinal(int x,int y,int z,int h):Derived1(x,y),Derived2(y,z),Base(z)
{
val=h;
}
void Print()
{
cout<<" "<<val;
}
};
int main()
{
DerivedFinal df(7,18,22,89); //定义对象
df.Print(); //输出虚基类Base的成员val的值
df.Print();
df.Base::set(56);
df.Print();
df.Base::Print();
df.Base::get();
return 0;
}