操作符重载专题-实现基本操作符重载

#include <iostream>
using namespace std;

class Complex
{
public:
	Complex()
	{

	}
	Complex(int a,int b)
	{
		this->m_a = a;
		this->m_b = b;
	}
	void printCom()
	{
		cout<<m_a<<"+"<<m_b<<"i"<<endl;
	}
	//成员函数方法实现+
	Complex operator+(Complex &obj)
	{
		Complex tmp(this->m_a+obj.m_a,this->m_b+obj.m_b);
		return tmp;
	}
	//成员函数实现前置--
	Complex& operator--()
	{
		this->m_a--;
		this->m_b--;
		return *this;
	}
	//成员函数实现后置--
	Complex operator--(int)
	{
		Complex tmp = *this;
		this->m_a--;
		this->m_b--;
		return tmp;
	}
private:
	int m_a;
	int m_b;
	friend Complex operator-(Complex &obj1,Complex &obj2);
	friend Complex& operator++(Complex &obj1);
	friend Complex operator++(Complex &obj1,int);
	friend ostream& operator<<(ostream &out,Complex &obj1);
protected:
private:
};
//全局函数方法实现+
Complex operator-(Complex &obj1,Complex &obj2)
{
	Complex tmp (obj1.m_a-obj2.m_a,obj1.m_b-obj2.m_b);
	return tmp;
}
//全局函数实现前置++
Complex& operator++(Complex &obj1)
{
	obj1.m_a++;
	obj1.m_b++;
	return obj1;
}
//全局函数实现后置++
Complex operator++(Complex &obj1,int)
{
	Complex tmp = obj1;
	obj1.m_a++;
	obj1.m_b++;
	return tmp;
}
//友元函数的真正应用场景
//全局函数实现<<  只能使用全局函数的形式 为什么？ 我们没法再ostream类中添加重载<<的成员函数
//链式编程 返回值为ostream的引用
ostream& operator<<(ostream &out,Complex &obj1)
{
	out<<obj1.m_a<<"+"<<obj1.m_b<<"i";
	return out;
}
int main()
{
	Complex m1(1,2);
	Complex m2(3,4);
	/*Complex m3;
	m3 = m1 + m2 ;
	m3.printCom();
	m3 = m2 - m1;
	m3.printCom();

	++m1;
	m1.printCom();

	--m1;
	m1.printCom();

	m1++;
	m1.printCom();

	m1--;
	m1.printCom();
	*/
	cout<<m1<<endl;

	system("pause");
	return 0;
}