title: QtConcurrent map() on in place array
body: <p>I have a large array of float.
  I would like to call <code>QtConcurrent::map()</code> on it and change the values in place.</p>
  
  <p>Can I do that without making a copy of the array?
  It seems <code>map()</code> takes a <code>QVector</code> as parameter and I can't find a mean to initialize a <code>QVector</code> from an array without making a copy.</p>