c++之operator运算符重载

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转载：http://blog.chinaunix.net/uid-21411227-id-1826759.html

一、实例

1.用成员函数来重载“+”运算符

vi test.cpp

#include <iostream>using namespace std;class X{   int i;public:   X(int ii=0){i=ii;}   X operator   +(const X &rx){       i+=rx.i;       return X(i);   }   int GetI(){return i;}};int main(){   X a(1),b(3);   cout<<(a+b).GetI()<<endl;   return 0;}

g++ -o test test.cpp

./test

2.用类的友元函数来重载“+”运算符

vi test.cpp

#include <iostream>using namespace std;class Complex{public:   Complex(double r=0.0,double i=0.0){       real=r;       image=i;   }   friend Complex operator+(const Complex&,const Complex&);   void display();private:   double real;   double image;};Complex operator+(const Complex &c1,const Complex &c2){   return Complex(c1.real+c2.real,c1.image+c2.image);}void Complex::display(){   cout<<"("<<real<<","<<image<<"i)"<<endl;}int main(){   Complex c1(3,4),c2(5,-10),c3;   c3=c1+c2;   cout<<"c1=";c1.display();   cout<<"c2=";c2.display();   cout<<"c1+c2=";c3.display();   return 0;}

g++ -o test test.cpp

./test

c1=(3,4i)c2=(5,-10i)c1+c2=(8,-6i)

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