title: Convert std::vector to JSON using CPPREST-SDK
body: <p>At the moment I am working on a c++ project, writing the server side of an API using the CPPRESTSDK (a.k.a. Casablanca).<br>
  Serializing values such as int, double etc. is already implemented in the cpprestsdk library.  </p>
  
  <p>I wanted to ask now, if there is any way to serialize a <code>std::vector</code> to a <code>json::value</code> at the client, make a reqeust and then deserialize it at the server?<br>
  Something like:</p>
  
  <pre><code>    http_client client(U("http://localhost"));
      json::value jsonVector(std::vector);
      make_task_request(client, methods::POST, jsonVector)
  </code></pre>
  
  <p>Thank you for everything in advance!</p>