title: How to overload the || operator to represent modulus of complex
body: <p>I would like to overload the || operator in such a way that I can use it to find the modulus of a complex number.
  I.E. </p>
  
  <pre><code>    Complex z(x0,y0);
      double mod = |z|;
  </code></pre>
  
  <p>Is it possible to do so? If so, how?</p>
  
  <p>Thanks </p>