title: How to rename Key for QMap?
body: <p>I have this <code>QMap&lt;int, myDB&gt; myTable</code> like this</p>
  
  <pre><code>(1, {something0})
  (3, {something1})
  (5, {something2})
  (8, {something3})
  </code></pre>
  
  <p>How can I change Key for <code>myTable</code> with first key begin from 0?</p>
  
  <pre><code>(0, {something0})
  (1, {something1})
  (2, {something2})
  (3, {something3})
  </code></pre>