C++运算符重载(插入and提取)

介绍

本文主要介绍 插入(>>) and 提取(<<)的运算符重载
1.插入(>>) 提取(<<)只能是友元函数
2.插入关键词istream
例子：istream& operator>>(istream& in, sumber&Left)
3.提取关键词ostream
例子：ostream& operator<<(ostream& in, sumber&Left);
4.PS：插入(istream) and 提取(ostream)重载的话类型后面 必须加上&

源码

#include<iostream>using namespace std;
class sumber
{//友元 插入(>>)重载friend istream& operator>>(istream& in, sumber&operand);//友元 提取(<<)重载friend ostream& operator<<(ostream& out, sumber&operand);
public://初始化构造函数sumber(int real = 0, int vir = 0) :m_real(real), m_vir(vir){}
private:int m_real;int m_vir;
};
//插入(>>)重载
istream& operator>>(istream& in, sumber&operand)
{//设置插入方法(步骤)in >> operand.m_real >> operand.m_vir;//返回插入流return in;
}
//提取(<<)重载
ostream& operator<<(ostream& out, sumber&operand)
{//设置提取方法(步骤)out << operand.m_real <<" "<< operand.m_vir;//返回插入流return out;
}
void main()
{sumber cp1(30,10);//通过重载操作实现cp1的输入输出cin >> cp1;cout << cp1 << endl;;system("pause");
}

运行结果

50 60
50 60
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