is provides the opportunity to initialise
the <I>arg_xxx</I> structure prior to parsing and nominally requires
resetting the argument count to zero. The <I>parent</I> parameter is
actually a pointer to the pertinent <I>arg_xxx</I> structure, and
should be cast appropriately. The casting may be done in the function
definition as shown in this example for an <I>arg_int</I> struct. 
</P>
<PRE CLASS="western">void myresetfn(struct arg_int *parent)
   {
   parent-&gt;count=0;
   }</PRE><P STYLE="margin-bottom: 0