c++ 多态

1、重载和多态的关系：

多态分为静态多态和动态多态：

静态多态 包含 重载和泛型编程

动态多态 ---》虚函数

 

2、重载案例：

//
// Created by luzhongshan on 10/18/19.
//
#include "stdlib.h"
#include "iostream"
using namespace std;
int Add(int left, int right)
{
    return left + right;
}
double Add(double left, int right)
{
    cout<<"sizeof a: "<< sizeof(left)<<"sizeof b:"<< sizeof(right)<

 

3、虚函数案例：

//
// Created by luzhongshan on 10/18/19.
//
#include "iostream"
using namespace std;

class TakeBus
{
public:
    void TakeBusToSubway()
    {
        cout << "go to Subway--->please take bus of 318" << endl;
    }
    void TakeBusToStation()
    {
        cout << "go to Station--->pelase Take Bus of 306 or 915" << endl;
    }
};
//知道了去哪要做什么车可不行，我们还得知道有没有这个车
class Bus
{
public:
    virtual void TakeBusToSomewhere(TakeBus& tb) = 0;  //？？？为什么要等于0
};

class Subway:public Bus
{
public:
    virtual void TakeBusToSomewhere(TakeBus& tb)
    {
        tb.TakeBusToSubway();
    }
};
class Station :public Bus
{
public:
    virtual void TakeBusToSomewhere(TakeBus& tb)
    {
        tb.TakeBusToStation();
    }
};

int main()
{
    TakeBus tb;
    Bus* b = NULL;
    Bus* a = NULL;
    //假设有十辆公交车，如果是奇数就是去地铁口的，反之就是去火车站的
    b = new Subway;
    a = new Station;

    b->TakeBusToSomewhere(tb);
    a->TakeBusToSomewhere(tb);
    delete b;
    return 0;
}