title: What is Warning 503 by SWIG?
body: <p>Please explain what are these warning by SWIG and how to avoid it?</p>
  
  <pre><code>Warning 503: Can't wrap 'operator ()' unless renamed to a valid identifier.
  Warning 503: Can't wrap 'operator =' unless renamed to a valid identifier.
  Warning 503: Can't wrap 'operator *' unless renamed to a valid identifier.
  </code></pre>
  
  <p>The warnings are generated when SWIG generated C++ code is compiled under Android NDK.</p>