title: Why do you use std::move when you have && in C++11?
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/q/3106110">What is move semantics?</a></p>
  </blockquote>
  
  
  
  <p>I recently attended a C++11 seminar and the following tidbit of advice was given.</p>
  
  <pre><code>when you have &amp;&amp; and you are unsure, you will almost always use std::move
  </code></pre>
  
  <p>Could any one explain to me why you should use <code>std::move</code> as opposed to some alternatives and some cases when you should not use <code>std::move</code>?</p>