ename</span> Sample<span class="special">,</span> <span class="keyword">typename</span> Impl<span class="special">&gt;</span> 
<span class="keyword">struct</span> <a class="link" href="p_square_quantile_impl.html" title="Struct template p_square_quantile_impl">p_square_quantile_impl</a> <span class="special">{</span>
  <span class="comment">// types</span>
  <span class="keyword">typedef</span> <span class="identifier">numeric</span><span class="special">::</span><span class="identifier">functional</span><s