title: Julia - ccall with pointer to function
body: <p>I want to use glut with my Julia code and call it with ccall, I know how to call the most functions, but what do I have to do if there is a callback, for example I have the following function I want to call, how does my ccall has to look like: </p>
  
  <pre><code>FGAPI void    FGAPIENTRY glutKeyboardUpFunc( void (* callback)( unsigned char, int, int ) );
  </code></pre>
  
  <p>Could anyone give me an example how my ccall has to look like?</p>