e command line. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>constraint</em>&nbsp;</td><td>- A pointer to a <a class="el" href="classTCLAP_1_1Constraint.html" title="The interface that defines the interaction between the Arg and Constraint.">Constraint</a> object used to constrain this <a class="el" href="classTCLAP_1_1Arg.html" title="A virtual base class that defines the essential data for all arguments.">Arg</a>. </td></tr>
    <tr><td valign="top"></td><td valign="top"><em>v</em>&nbsp;<