nt, referred to as a single-element sequence. Re-entrant version. </p>
</div>
<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<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/is_unary_hpp.html" title="Header &lt;boost/vmd/is_unary.hpp&gt;">boost/vmd/is_unary.hpp</a>&gt;

</span>BOOST_VMD_IS_UNARY_D