运算符重载

#include

using namespace std;


//加号运算符重载
//全局函数重载加号
 
class Person{
	public:
		int a;
		int b;
//		Person operator+(Person &p){//成员函数的本质 
//			Person temp;
//			temp.a=p.a+this->a;
//			temp.b=p.b+this->b;
//			return temp;	
//		}	
};

Person operator+(Person &p1,Person &p2){
	Person temp;
	temp.a=p1.a+p2.a;
	temp.b=p1.b+p2.b;
	return temp;
} 
int main(){
	Person p1;
	Person p2;
	p2.a=12;
	p2.b=23;
	p1.a=10;
	p1.b=10;
	Person p3=p1+p2;
	cout<"------------"<endl;
}

左移运算符重载

#include


using namespace std;


class Person{
	friend ostream & operator<<(ostream &cout,Person &p);
	private:
		int a;
		int b;
	public:
		Person(int a,int b){
			this->a=a;
			this->b=b;
		}
};

ostream & operator<<(ostream &cout,Person &p){
	cout<"-----------"<
}

int main(){
	Person p1(12,23);
	cout<endl;//直接输出对象
	
}

递增运算符重载

#include


using namespace std;

//自增运算符重载 

class MyInteger{
	friend ostream & operator<<(ostream &cout,MyInteger Integer);//为什么不传引用 
	private:
		int num;
		
	public:
		MyInteger(){
			num=0;
		}
	MyInteger& operator++(){//前置++
		num++;
	return *this;
	}
	
	MyInteger operator++(int){//后置++
		MyInteger temp=*this;
		num++;
		return temp;
	}
	 	
}; 
ostream & operator<<(ostream &cout,MyInteger Integer){
	cout<
	return cout;
}
//重载++运算符
 //前置++,后置++;
 
 void test(){
 	MyInteger myint;
	cout<endl;
	cout<endl;
 	
 }
int main(){
	MyInteger num;
	cout<endl;
	cout<<++num<<endl; 
	cout<endl;
	test();
}

赋值运算符重载

#include

using namespace std;

class Person{
	public:
		int *a;
	public:
		Person(int age){
			a=new int(age);
		}
		~Person(){
			if(a!=NULL){
				delete(a);
				a=NULL;
			}
		}
		Person & operator=(Person &p){
			if(a!=NULL){
				delete(a);
			} 
			a=new int(*p.a);//深拷贝 
			return *this; 
		} 
};

void test(){
	Person p1(20);
	Person p2(10);
	Person p3(10);
	p3=p2=p1;
	cout<< *p2.a<<endl;
	cout<< *p3.a<<endl;
}

int main(){
	test();
}

关系运算符重载

#include

using namespace std;

class Person{
	private:
		int age;
		string name;
	public:
		Person(int age,string name){
			this->age=age;
			this->name=name;
		}
		bool operator==(Person &p){
			if(this->age==p.age&&this->name==p.name){
				return true;
			}
			return false;
		}
};

int main(){
	Person p1(12,"java");
	Person p2(12,"java");
	if(p1==p2){
		cout<<"p1=p2"<<endl;
	}else{
		cout<<"p1!=p2"<<endl;
	}
}

仿函数

#include
using namespace std;

class Person{
	public:
		void operator()(string text){
			cout<<text<<endl;
		}
};
int main(){
	Person p1;
	p1("Hello world");
    Person()("123");//匿名对象 
}