#include "iostream"
using namespace std;
class base
{
public:
int k;
void printI()
{
//cout<<i<<endl;
}
protected:
private:
};
class base1 : virtual public base
{
public:
int i;
void printI()
{
cout<<i<<endl;
}
protected:
private:
};
class base2 : virtual public base
{
public:
int j;
void printJ()
{
cout<<j<<endl;
}
protected:
private:
};
class C : public base1, public base2
{
public:
protected:
private:
};
void main()
{
C c1;
c1.k = 100; //如果不加virtual會提示訪問不明確,virtual的目的是使公共基類在衆多派生類中只產生一個子對象
system("pause");
}
多繼承:1多層繼承(爺父孫) 2繼承多個
虛繼承這種方法一般不使用!!!
而是使用純虛函數虛函數實現多繼承(接口作用)
多繼承的工程應用場景
#include "iostream"
using namespace std;
/*
C++中沒有接口的概念
C++中可以使用純虛函數實現接口
接口類中只有函數原型定義,沒有任何數據的定義。
*/
class Interface1
{
public:
virtual void print() = 0;
virtual int add(int i, int j) = 0;
};
class Interface2
{
public:
virtual int add(int i, int j) = 0;
virtual int minus(int i, int j) = 0;
};
class parent
{
public:
int i,j;
};
class Child : public parent, public Interface1, public Interface2
{
public:
void print()
{
cout<<"Child::print"<<endl;
}
int add(int i, int j)
{
return i + j;
}
int minus(int i, int j)
{
return i - j;
}
};
int main()
{
Child c;
c.print();
cout<<c.add(3, 5)<<endl;
cout<<c.minus(4, 6)<<endl;
Interface1* i1 = &c;
Interface2* i2 = &c;
cout<<i1->add(7, 8)<<endl;
cout<<i2->add(5,6)<<endl;
system("pause");
}