操作符重载专题-实现基本操作符重载

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#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;}
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