title: What is 1 << 0?
body: <pre><code> enum
      {
        kFlag_FPS         = 1 &lt;&lt; 0,
        kFlag_Help        = 1 &lt;&lt; 1,
        kFlag_RedBlue3D   = 1 &lt;&lt; 2,
      }
  </code></pre>
  
  <p>I am trying to understand what this code is I don't quite know what:</p>
  
  <pre><code>1 &lt;&lt; 0
  </code></pre>
  
  <p>means?</p>
  
  <p>Any help is greatly appreciated!</p>