title: What is the purpose of the statement "(void)c;"?
body: <p>Sorry for the vague title, but not really sure how to phrase it. So I was looking through the innards of boost::asio (trying to track down some ridiculous delays), and I notice code like this dotted about:</p>
  
  <pre><code>    op_queue&lt;operation&gt; completed_ops;
      task_cleanup c = { this, &amp;lock, &amp;completed_ops };
      (void)c;  // EH?
  </code></pre>
  
  <p>Now from the name of the struct that is being initialized, I'm guessing it's using RAII to do some steps on destruction - fine, but what is the purpose of the last line? Have I just missed something completely funky?</p>