title: what C++ style syntax does this belong to
body: <p>Recently I came across a snippet similar to the following:</p>
  
  <pre><code>int a  &lt;:20:&gt;;
  int b;
  void foo()
  &lt;% 
   printf("Hello world"); 
   a &lt;: ++b :&gt; = 440;
  %&gt;
  </code></pre>
  
  <p>What C++ style/syntax does this belong to? 
  Thanks for your answer.</p>