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c++-----运算符重载-创新互联

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一、加法运算符重载

二、左移运算符重载

三、前置递增运算符重载

四、后置递增运算符重载

五、指针运算符重载

六、等号运算符重载

七、关系运算符重载

八、函数调用运算符重载

九、函数重载注意事项

一、加法运算符重载
#define _CRT_SECURE_NO_WARNINGS
#includeusing namespace std;

class Person {
public:
	Person()
	{

	}
	Person(int a, int b):m_A(a),m_B(b){}

	//利用成员函数实现加法运算符重载
	//Person operator+(Person& p)
	//{
	//	Person temp;
	//	temp.m_A = this->m_A + p.m_A;
	//	temp.m_B = this->m_B + p.m_B;
	//	return temp;
	//}

	int m_A;
	int m_B;
};

//利用全局函数实现加法运算符重载
Person operator+(Person& p1, Person& p2)
{
	Person temp;
	temp.m_A = p1.m_A + p2.m_A;
	temp.m_B = p1.m_B + p2.m_B;
	return temp;
}

//运算符重载可以发生函数重载
Person operator+(Person& p1, int num)
{
	Person temp;
	temp.m_A = p1.m_A + num;
	temp.m_B = p1.m_B + num;
	return temp;
}

void test01()
{
	Person p1(10,10);
	Person p2(20, 20);
	
	//Person p3 = operator+(p1, p2);	//全局函数本质
	//Person p3 = p1.operator+(p2);		//成员函数本质
	
	Person p3 = p1 + p2;				//简化
	
	cout<< "p3.m_A = "<< p3.m_A<< "  p3.m_B = "<< p3.m_B<< endl;
}

void test02()
{
	Person p1(10, 10);
	Person p2 = p1 + 10;
	cout<< "p2.m_A = "<< p2.m_A<< "  p2.m_B = "<< p2.m_B<< endl;

}

int main()
{

	//test01();
	test02();
	system("pause");
	return EXIT_SUCCESS;
}
二、左移运算符重载
#define _CRT_SECURE_NO_WARNINGS
#includeusing namespace std;

class Person {
	friend ostream& operator<<(ostream& cout, Person& p);

public:
	Person(int a, int b)
	{
		this->m_A = a;
		this->m_B = b;
	}
private:
	int m_A;
	int m_B;
};

ostream& operator<<(ostream &cout,Person &p)
{
	cout<< "m_A = "<< p.m_A<< "  m_B = "<< p.m_B;
	return cout;
}

void test01()
{
	Person p1(10, 10);
	cout<< p1<< endl;
}

int main()
{

	test01();
	system("pause");
	return EXIT_SUCCESS;
}
三、前置递增运算符重载
#define _CRT_SECURE_NO_WARNINGS
#includeusing namespace std;

class MyInt {
	friend ostream& operator<<(ostream& cout, MyInt& p);
public:
	MyInt()
	{
		this->m_A = 0;
	}
	//前置++ 重载
	MyInt& operator++()
	{
		this->m_A++;
		return *this;
	}
private:
	int m_A;
};

ostream& operator<<(ostream& cout, MyInt& p)
{
	cout<< p.m_A;
	return cout;
}

void test01()
{
	MyInt p1;
	cout<< ++(++p1)<< endl;
	cout<< p1<< endl;
}


int main()
{

	test01();
	system("pause");
	return EXIT_SUCCESS;
}
四、后置递增运算符重载
#define _CRT_SECURE_NO_WARNINGS
#includeusing namespace std;

class MyInt {
	friend ostream& operator<<(ostream& cout, MyInt p);
public:
	MyInt()
	{
		this->m_A = 0;
	}
	//后置++ 重载
	MyInt operator++(int)
	{
		MyInt temp = *this;
		this->m_A++;
		return temp;
	}

private:
	int m_A;
};

ostream& operator<<(ostream& cout, MyInt p)
{
	cout<< p.m_A;
	return cout;
}

void test02()
{
	MyInt p;
	cout<< p++<< endl;
	cout<< p++<< endl;
	//cout<< p<< endl;
}

int main()
{
	test02();
	system("pause");
	return EXIT_SUCCESS;
}
五、指针运算符重载
#define _CRT_SECURE_NO_WARNINGS
#includeusing namespace std;

class Person {
public:
	Person(int a)
	{
		cout<< "Person的有参构造函数调用"<< endl;
		m_Age = a;
	}
	void showAge()
	{
		cout<< "年龄 : "<< this->m_Age<< endl;
	}
	~Person()
	{
		cout<< "Person的析构函数调用"<< endl;
	}

private:
	int m_Age;
};

class SmartPoint {
public:
	SmartPoint(Person *Person)
	{
		this->m_Person = Person;
	}

	//重载->Person* operator->()
	{
		return this->m_Person;
	}
	//重载*
	Person& operator*()
	{
		return *m_Person;
	}

	~SmartPoint()
	{
		if (this->m_Person)
		{
			delete this->m_Person;
			this->m_Person = NULL;
		}
	}
private:
	Person *m_Person;
};

void test01()
{
	//Person *p1 = new Person(18);
	//p1->showAge();
	//(*p1).showAge();
	//delete p1;

	//利用智能指针  管理new出来的Person的释放操作
	SmartPoint sp(new Person(18));

	sp->showAge();	//本质sp->->showAge()  编译器优化sp->showAge()
	(*sp).showAge();
	
}

int main()
{

	test01();

	system("pause");
	return EXIT_SUCCESS;
}
六、等号运算符重载
#define _CRT_SECURE_NO_WARNINGS
#includeusing namespace std;

//编译器默认给一个类添加四个函数  默认构造  析构函数  拷贝构造（值拷贝）  operator=(值拷贝)
class Person {
public:
	Person(const char* name, int age)
	{
		this->m_Name = new char[strlen(name) + 1];
		strcpy(m_Name, name);
		this->m_Age = age;
	}

	//重载=
	Person& operator=(const Person& p)
	{
		if (this->m_Name != NULL)
		{
			delete [] this->m_Name;
			this->m_Name = NULL;
		}
		this->m_Name = new char[strlen(p.m_Name) + 1];
		strcpy(this->m_Name, p.m_Name);
		this->m_Age = p.m_Age;
		return *this;
	}

	~Person()
	{
		if (this->m_Name != NULL)
		{
			delete [] this->m_Name;
			this->m_Name = NULL;
		}
	}

	char* m_Name;
	int m_Age;
};

void test01()
{
	Person p1("Tom",18);
	Person p2("Jerry",20);
	Person p3("", 30);
	p3 = p2 = p1;
	cout<< "姓名: "<< p1.m_Name<< "  年龄 = "<< p2.m_Age<< endl;
	cout<< "姓名: "<< p2.m_Name<< "  年龄 = "<< p2.m_Age<< endl;
	cout<< "姓名: "<< p3.m_Name<< "  年龄 = "<< p2.m_Age<< endl;
}

int main()
{
	test01();
	system("pause");
	return EXIT_SUCCESS;
}
七、关系运算符重载
#define _CRT_SECURE_NO_WARNINGS
#includeusing namespace std;

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

	string m_Name;
	int m_Age;
};

void test01()
{
	Person p1("Tom", 18);
	Person p2("Tom", 18);
	if (p1 == p2)
		cout<< "p1 == p2"<< endl;
	else
		cout<< "p1 != p2"<< endl;
	if (p1 != p2)
		cout<< "p1 != p2"<< endl;
	else
		cout<< "p1 == p2"<< endl;

}

int main()
{
	test01();
	system("pause");
	return EXIT_SUCCESS;
}
八、函数调用运算符重载
#define _CRT_SECURE_NO_WARNINGS
#includeusing namespace std;

class MyPrint {
public:
	void operator()(string test)
	{
		cout<< test<< endl;
	}
};

void myPrint2(string str)
{
	cout<< str<< endl;
}

void test01()
{
	MyPrint myPrint;
	myPrint("hello world");     //仿函数   本质是一个对象  函数对象
	myPrint2("hello world");	//普通函数
}

class MyAdd {
public:
	int operator()(int a,int b)
	{
		return a + b;
	}
};

void test02()
{
	//MyAdd myAdd;
	//cout<< myAdd(1, 2)<< endl;

	cout<< MyAdd()(1, 2)<< endl;	//匿名函数对象  特点 ：当前执行完立即释放
}

int main()
{
	//test01();
	test02();
	system("pause");
	return EXIT_SUCCESS;
}
九、函数重载注意事项

不要重载&&和||

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