title: Does anyone have information on using operator""?
body: <p>Bjarne Stroustrup gave a keynote presentation today for the Going Native 2012 conference. In his presentation, he discussed the issue of enforcing correct units. His elegant (IMHO) solution to this involved using an operator I have never heard of before: <code>operator""</code>. Using this operator, he was able to write C++ code that looked like this:</p>
  
  <pre><code>ratio = 100m / 1s;
  </code></pre>
  
  <p>Where <code>operator""m(...)</code> and <code>operator""s(...)</code> were defined.</p>
  
  <p>Does anyone know of any documentation regarding how to actually use this operator (or even if any modern C++ compilers support it)? I tried searching online, but had no luck. Any help would be greatly appreciated.</p>