n><span class="special">,</span> <span class="identifier">size</span><span class="special">());</span> <span class="comment">// Old values for virtuals.</span>
        <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract</span><span class="special">::</span><span class="identifier">check</span> <span class="identifier">c</span> <span class="special">=</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">contract<