重载运算符操作_学习

//A:  操作符重载实现为类成员函数
/*
#include <iostream>
class Person
{
private:int age;
public:Person(int a){this->age=a;}//inline bool operator==(const Person &ps)const;inline bool operator==(const Person *ps)const;
};
//inline bool Person::operator==(const Person &ps)const{
//	std::cout<<"this->age=="<<this->age<<",  ps.age=="<<ps.age<<"\n";
//	if(this->age == ps.age)
//		return true;
//	else
//		return false;
//};
inline bool Person::operator==(const Person *ps)const{std::cout<<"this->age=="<<this->age<<",  ps->age=="<<ps->age<<"\n";if(this->age == ps->age)return true;elsereturn false;
};int main()
{//Person p1(10);//Person p2(10);Person *a = new Person(10);Person *b =  new Person(10);//if(p1 == p2)if(a == b){std::cout<<"相等\n";}elsestd::cout<<"不相等\n";system("pause");return 0;//由上面的测试可以得出结论，指针与指针之间是不能进行重载运算符比较的
}*///B:操作符重载实现为非类成员函数(全局函数)
#include <iostream>
using namespace std;
class Person
{
public:int age;
};
bool operator==(Person const &p1, Person const &p2)
{if(p1.age == p2.age)return true;elsereturn false;
};class Test
{
private:int m_value;
public:Test(int x=3){ m_value = x; }Test &operator++(); //前增量Test &operator++(int);//后增量void display(){cout<<"m_value="<<m_value<<"\n";}
};//前增量 Test& 是指返回一个Test的地址
Test& Test::operator++(){m_value++; //先增量return *this; //返回当前对像
};//后增量
Test& Test::operator++(int)
{Test tmp(*this); //创建临时对像m_value++; //再增量return tmp; //返回临时对像
}int main()
{Person a;Person b;a.age=10;b.age=10;if(a == b){cout<<"相等\n";}elsecout<<"不相等\n";cout<<"进行另外一个测试\n";Test t;t.display();t++;t.display();++t;t.display();system("pause");return 0;
}