Class operators [RESOLVED]

Say that we had a class, A, in which is defined as such:

Code:

---

class A
{
        public:
                A& operator=(const A& rhs);
                A operator+(const float &rhs) const;
}

---

Now this would allow us to do things such as:

Code:

---

A = A + 5;

---

How could we make it so that:

Code:

---

A = 5 + A;

---

would be valid?

Code:

---

class A
{

// ...
  friend A operator+(float f, const A& a);
}


A operator+(float f, const A& a)
{
  // ....
}

---

Thanks for all your help. :)