title: What does 'const&' mean in C++?
body: <p>Apologies for this, I am a student trying to learn C++ and I just thought it'd be better to ask than to not know.</p>
  <p>I understand what the &quot;address of&quot; operator <code>&amp;</code> and the <code>const</code> keyword mean separately. But when I was reading some sample code I saw <code>const&amp;</code>, and I just wanted to know what it means.</p>
  <p>It was used in place of an argument in a function prototype, for example:</p>
  <pre><code>void function (type_Name const&amp;);
  </code></pre>
  <p>If only one of them were used I would understand but I am a little confused here, so some professional insight would be great.</p>