c++this指针演示链式编程思想

举例说明

Worker员工类，有workerA,workerB两个人，通过workerA.addMoney(workerB).addMoney(workerB)…不断把B的工资累加到A的工资上。

关键函数Worker& addMoney(Worker& workerB)注意点：

1. 返回类型需要是引用，只有返回自身才可以不断添加（不可以为拷贝）
2. return *this表示返回this指针指向的实体本身类型

代码如下

#include<iostream>
using namespace std;

class Worker{
public:
    Worker(int salary){
        this->salary = salary;
    }
    Worker& addMoney(Worker& workerB){
        this->salary +=workerB.getSalary();
        return *this;
    }
    int getSalary(){
        return this->salary;
    }
private:
    int salary;
};
int main(){
    Worker workerA(10);
    Worker workerB(5);
    cout<<workerA.getSalary()<<endl;//10
    workerA.addMoney(workerB).addMoney(workerB).addMoney(workerB);
    cout<<workerA.getSalary()<<endl;//10+5+5+5=25
    return 0;
}