lDelta </td>
          <td>(</td>
          <td class="paramname"></td><td>)</td>
          <td></td>
        </tr>
      </table>
</div><div class="memdoc">
<pre>
Advanced usage: model "delta". If used, "model" must be unset. See the
definition of <a class="el" href="classcom_1_1google_1_1ortools_1_1linearsolver_1_1MPModelDeltaProto.html">MPModelDeltaProto</a>.
</pre><p><code>optional .operations_research.MPModelDeltaProto model_delta = 8;</code> </p><dl class="section return"><dt>Returns</dt><dd>Whether t