ss="pre">parameter::parameters::operator()</span></tt>
can't accept non-const rvalues.</p>
</div>
<div class="section" id="extracting-parameter-types">
<h3>3.2.2&nbsp;&nbsp;&nbsp;Extracting Parameter Types</h3>
<p>If we want to know the types of the arguments passed to
<tt class="docutils literal">print_name_and_index</tt>, we have a couple of options.  The
simplest and least error-prone approach is to forward them to a
function template and allow <em>it</em> to do type deduction:</p>
<pre class="literal-bl