title: How do I use C++ <filesystem> in Visual Studio Express 2013?
body: <p>I have been trying to use the C++ 14 experimental filesystem feature in VS Express 2013 without success. If I add the following line the code compiles;</p>
  
  <pre><code>#include &lt;filesystem&gt;
  </code></pre>
  
  <p>After adding the following;</p>
  
  <pre><code>using std::tr2::sys;
  </code></pre>
  
  <p>the code does note compile and gives following error message:</p>
  
  <pre><code>Error   1   error C2873: 'std::tr2::sys' : symbol cannot be used in a using-declaration
  </code></pre>
  
  <p>How correctly can I use the filesystem. Tried to visit <a href="http://msdn.microsoft.com/en-us/library/hh874694" rel="nofollow">http://msdn.microsoft.com/en-us/library/hh874694</a> and could not find a clear explanation of how to use it.</p>