>void</span> <span class="special">*</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">,</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">size_t</span><span class="special">)</span> <span class="special">=</span> <span class="number">0</span><span class="special">;</span>
  <span class="keyword">virtual</span> <span class="keyword">bool</span> <a c