title: Swift preprocessor if not flag
body: <p>Is there some kind of <code>#if not</code> for a swift flag ? </p>
  
  <p>I know </p>
  
  <pre><code>#if myFlag
  
  #else 
  
  #endif
  </code></pre>
  
  <p>could work, but it ain't pretty if there is nothing between <code>if</code> and <code>else</code>. </p>