title: Converting callback from C++ to C++/CX
body: <p>In code I am porting I have this function which takes function as an argument:</p>
  
  <pre><code>void doSomething(std::function&lt;void(std::string)&gt; callback)
  </code></pre>
  
  <p>Could you please tell me how to implement this function in C++/CX, how to convert std::function to C++/CX delegate and how to call the callback later on from C++?</p>