What does it mean in constructor declaration
<blockquote>
  <p><strong>Possible Duplicate:</strong><br>
  <a href="http://stackoverflow.com/questions/210616/what-is-the-member-variables-list-after-the-colon-in-a-constructor-good-for">What is the member variables list after the colon in a constructor good for?</a>  </p>
</blockquote>



<p>I found this code, its a constructor for Vector3f class.</p>

<pre><code>Vector3f::Vector3f()
    : x(0)
    , y(0)
    , z(0)
{

}
</code></pre>

<p>what does this definition ": x(0), y(0), z(0)" mean, and how would I go around using it?</p>
