title: Does using const CString& instead of CString alone as function parameter have any performance benefit?
body: <p>I have a function that takes a <code>CString</code> as one of the parameters and I was looking through the code base and many places have <code>const CString&amp;</code> instead as a argument.</p>
  
  <p>So I want to know if there is a performance or behavior difference between using <code>CString</code> vs <code>const CString&amp;</code>?</p>