value returned needs to be concatenated using
          BOOST_PP_CAT with an empty value. You can use BOOST_VMD_IDENTITY_RESULT
          to accomplish this transparently.
        </li>
<li class="listitem">
          Avoid using an empty parenthesis to pass no data as a tuple or seq if VC++8
          might be used as the compiler.
        </li>
</ul></div>
<p>
      When using VC++ with its new standard conforming preprocessor, which as of
      now is not its default preprocessor in Visual Studio 2019, n