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  28 <h2><span class="refentrytitle">Macro BOOST_VMD_EMPTY</span></h2>
  29 <p>BOOST_VMD_EMPTY &#8212; Outputs emptiness. </p>
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  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="header/boost/vmd/empty_hpp.html" title="Header &lt;boost/vmd/empty.hpp&gt;">boost/vmd/empty.hpp</a>&gt;
  33
  34 </span>BOOST_VMD_EMPTY(...)</pre></div>
  35 <div class="refsect1">
  36 <a name="idp84532768"></a><h2>Description</h2>
  37 <p>... = any variadic parameters. The parameters are ignored.</p>
  38 <p>This macro is used to output emptiness ( nothing ) no matter what is passed to it.</p>
  39 <p>If you use this macro to return a result, as in 'result BOOST_VMD_EMPTY' subsequently invoked, you should surround the result with BOOST_VMD_IDENTITY_RESULT to smooth over a VC++ problem. </p>
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