Re: operator= for a class with a const reference member

I have a class that has a member that is a const reference:

class MyClass
{
public:
   MyClass(const AnotherClass& ac);
   MyClass(const MyClass& mc);
   MyClass& operator= (const MyClass& mc);

private:
   const AnotherClass &m_ref ;
};

How do I implement the assignment "constructor"?

MyClass& MyClass::operator= (const MyClass& mc)
{
    m_ref = mc.m_ref ; //dosen't compile (obviously)
    m_ref(mc.m_ref) ; //dosen't compile (obviously)
}