在C ++中，如何在不通过参数传递对象的情况下重载运算符？

Question

For example, I'd like the following to output the number 6, but every example I've ever seen of operator overloading contains a "const" object in the parameters.

Class MyClass
{
    private:
        int num;
    public:
        //Setter
        void setNum(int x)            {num = x;}

        //Getter
        int getNum()                  {return x;}

        //Overloading + Operator
        MyClass operator + (int add)
        {
        }
};

int Main()
{
    MyClass test;
    test.setNum(2);
    test = test + 4;
    cout << test.getNum();
    return 0;
}

Answer 1

Here is the code that does what you want:

class MyClass
{
    private:
        int num;
    public:
        //Setter
        void setNum(int x)            {num = x;}

        //Getter
        int getNum()                  {return num;}

        //Overloading + Operator
        MyClass operator + (int add)
        {
            MyClass copy;
            copy.num = num + add;
            return copy;
        }
};

int main()
{
    MyClass test;
    test.setNum(2);
    test = test + 4;
    std::cout << test.getNum();
    return 0;
}

Your code had a number of compiler errors that have also been fixed. For instance, Class should be class and Main should be main.