span class="special">&lt;</span><span class="identifier">Q1</span><span class="special">,</span><span class="identifier">Q2</span><span class="special">&gt;;</span>
</pre>
</div>
<div class="section">
<div class="titlepage"><div><div><h3 class="title">
<a name="boost_units.Utilities.Metaprogramming_Predicates"></a><a class="link" href="Utilities.html#boost_units.Utilities.Metaprogramming_Predicates" title="Metaprogramming Predicates">Metaprogramming
      Predicates</a>
</h3></div></div></div>
<pre class="p