Reference Passing
<p>I am reading the follow question <a href="http://stackoverflow.com/questions/4481224/towers-of-hanoi-question">Towers of Hanoi question</a>. The first answer say use</p>

<pre><code>stack&lt;int&gt;&amp;
</code></pre>

<p>My question is why this?. What happened in the memory?</p>
