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前言

提示：这里可以添加本文要记录的大概内容：

例如：C++运算符重载

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提示：以下是本篇文章正文内容，下面案例可供参考

一、加号运算符

完成自定义类型加号运算符
使用成员函数和全局函数都可以完成

#include<iostream>
using  namespace std;
#include<string>
/*函数运算符重载*/class Operate
{
private:/* data */
public:Operate(/* args */);~Operate();Operate(int a, int b) {this->m_numa = a;this->m_numb = b;}//成员函数方式// Operate operator+(Operate &temp1) {//     Operate temp;//     temp.m_numa = this->m_numa+temp1.m_numa;//     temp.m_numb = this->m_numb+temp1.m_numb;//     return temp;// }int m_numa;int m_numb;
};Operate::Operate(/* args */)
{
}Operate::~Operate()
{
}
//全员函数方式
Operate operator+(Operate &temp1,Operate &temp2) {Operate temp;temp.m_numa = temp1.m_numa + temp2.m_numa;temp.m_numb = temp1.m_numb + temp2.m_numb;return temp;
}
//运算符 函数重载
Operate operator+(Operate &temp1, int b) {temp1.m_numb = temp1.m_numb + b;return temp1;
}
int main()
{Operate p1(10, 10);cout << "numa = "<< p1.m_numa << endl;cout << "numb = "<< p1.m_numb << endl;Operate p2(10, 10);cout << "numa = "<< p2.m_numa << endl;cout << "numb = "<< p2.m_numb << endl;Operate p3 = p1 + p2;cout << "numa = "<< p3.m_numa << endl;cout << "numb = "<< p3.m_numb << endl;}

二、左移运算符

目的：为了可以直接实现cout输出一个对象。
只能使用全局函数实现

class Operate
{friend ostream & operator<<(ostream &cout,Operate &temp);
private:/* data */
public:Operate(/* args */);~Operate();Operate(int a, int b) {this->m_numa = a;this->m_numb = b;}//成员函数方式// Operate operator+(Operate &temp1) {//     Operate temp;//     temp.m_numa = this->m_numa+temp1.m_numa;//     temp.m_numb = this->m_numb+temp1.m_numb;//     return temp;// }int m_numa;int m_numb;
};ostream & operator<<(ostream &cout,Operate &temp) {cout <<"numa = "<<temp.m_numa << " numb = " << temp.m_numb ;return cout;
}

三.递增或者递减运算符

代码如下（示例）：

class Myprint
{
private:/* data */int M_a;
public:Myprint(/* args */);Myprint(int a){this->M_a = a;}~Myprint();//前置++返回引用，为了操作是同一个对象Myprint& operator++() {this->M_a++;return *this;}//后置++返回值，int 是占位符，函数重载的条件Myprint operator++(int) {Myprint temp = *this;this->M_a++;return temp;}//前置--返回引用，为了操作是同一个对象Myprint& operator--() {this->M_a--;return *this;}//后置--返回值，int 是占位符，函数重载的条件Myprint operator--(int) {Myprint temp = *this;this->M_a--;return temp;}friend ostream & operator<<(ostream &cout, Myprint temp);
};Myprint::Myprint(/* args */)
{
}Myprint::~Myprint()
{
}ostream & operator<<(ostream &cout, Myprint temp) {cout << temp.M_a;return cout;
}
int main()
{Myprint a(10);cout << a << endl;//++ testcout << ++a << endl;cout << a << endl;cout << a++ << endl;cout << a << endl;//-- testcout << --a << endl;cout << a << endl;cout << a-- << endl;cout << a << endl;
}

总结

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