c++单双目操作符重载

#include <iostream>
using namespace::std;
class MyClass
{
public:
    MyClass(int a, int b)
         {
        this->a = a;
        this->b = b;
         }
    void print_Myclass()
    {

        cout << this->a << '+' << b << 'i' << endl;

    }
    //friend MyClass operator+=(MyClass &c1, MyClass &c2);
    friend MyClass  operator++(MyClass &c);
    friend const MyClass operator++(MyClass &c, int);
    MyClass operator+=(MyClass &anthor)//类的内部的重载
    {
        this->a += anthor.a;
        this->b += anthor.b;
        return *this;

    }

private:
    int a;
    int b;

};
/*MyClass operator+=(MyClass &c1,MyClass &c2)//全局的重载+=
{
    c1.a += c2.a;
    c1.b += c2.b;
    return c1;
}*/
/*MyClass  operator++(MyClass &c)//重载的是前++
{
    c.a++;
    c.b++;
    return c;


}*/
const MyClass  operator++(MyClass &c,int)//重载的是后++
{
    MyClass tem(c.a, c.b); 
    c.a++;
    c.b++;
    return tem;
}
int main()
{
    MyClass c1(2, 3);
    MyClass c2(3, 4);
    MyClass c3(4, 4);
    //c1 += c2+=c3;
    //++++c1;
    c1++;
    c1.print_Myclass();
    system("pause");


}

结果显示：