title: Is it possible to use boost::program_options to capture arguments w/o dash?
body: <p>With <strong>boost::program_options</strong>, if the arguments are not part of <code>-</code>, <code>--</code> or <code>/</code> options(neither the options themselves nor their possible values), can I capture the list of these arguments separately?</p>
  
  <p>For example, I'd like to write a <code>ls</code> program. I hope I can have similar implementation like:</p>
  
  <pre><code>ls -l --color=always &lt;file_dir_1&gt; &lt;file_dir_2&gt; ... &lt;file_dir_n&gt;
  </code></pre>
  
  <p>where I can capture <code>&lt;file_dir_1&gt;</code> ... <code>&lt;file_dir_n&gt;</code> and handle them specially.</p>