k">
namespace lib
{
  <strong>namespace keywords
  {</strong>
     BOOST_PARAMETER_NAME(name)
     BOOST_PARAMETER_NAME(index)
  <strong>}</strong>

  BOOST_PARAMETER_FUNCTION(
    (int), f, <strong>keywords::</strong>tag,
    (optional (name,*,&quot;bob&quot;)(index,(int),1))
  )
  {
      std::cout &lt;&lt; name &lt;&lt; &quot;:&quot; &lt;&lt; index &lt;&lt; std::endl;
      return index;
  }
}
</pre>
<!-- @example.prepend('''
#include <boost/parameter.hpp>
#include <iostream>''') -->
<p>Now users need on