KEYWORD(copyable)

template <class B = int>
struct bases
{};

}}''') -->
</div>
<div class="section" id="argument-packs-and-parameter-extraction">
<span id="binding-intro"></span><h4>2.4.1.4&nbsp;&nbsp;&nbsp;Argument Packs and Parameter Extraction</h4>
<p>Next, within the body of <tt class="docutils literal">class_</tt> , we use the <span class="concept">ParameterSpec</span>'s
nested <tt class="docutils literal">::bind&lt; … &gt;</tt> template to bundle the actual arguments into an
<a class="reference ext