<pre class="programlisting"><span class="keyword">template</span><span class="special">&lt;</span>
    <span class="keyword">class</span> <span class="identifier">RatePolicy_</span><span class="special">,</span>
    <span class="keyword">class</span><span class="special">...</span> <span class="identifier">Args</span><span class="special">&gt;</span>
<span class="identifier">impl_type</span><span class="special">(</span>
    <span class="identifier">std</span><span class="special">::</span><span class="iden