n class="special">::</span><span class="identifier">method</span> <span class="special">&amp;</span><span class="identifier">method</span><span class="special">()</span> <span class="keyword">const</span> <span class="special">{</span> <span class="keyword">return</span> <span class="identifier">_m_impl</span><span class="special">-&gt;</span><span class="identifier">method</span><span class="special">();</span> <span class="special">}</span>

    <span class="keyword">void</span> <span class="identifier">s