Q:

Use of unary plus operator

I've heard it is used as overloaded operator+ for example
class MyClass
{
    int x;
public:
    MyClass(int num):x(num){}
    MyClass operator+(const MyClass &rhs)
    {
        return rhs.x + x;
    }
};

int main()
{
    MyClass x(100);
    MyClass y(100);
    MyClass z = x + y;
}

Is this really the use of unary plus operator or is it really a binary + operator?

A:

This is not overloading and using unary + .. You need to either make that a free function or make the member function take 0 arguments
class MyClass
{
    int x;
public:
    MyClass(int num):x(num){}
    MyClass operator+() const
    {
        return *this;
    }
};

int main() {
  MyClass x = 42;
  + x;
}

A:

That's a binary + operator. To overload the unary plus operator, you'd need something like this.

