title: how to change address of variable?
body: <p>i have </p>
  
  <pre><code>Tree&lt;std:string&gt; tree;
  </code></pre>
  
  <p>now</p>
  
  <pre><code>new Tree&lt;std:string&gt;;
  </code></pre>
  
  <p>leads to a pointer,
  how can i change address of tree to that of pointer generated by new?</p>