/*
 *  call-seq:
 *     searcher.max_doc -> number
 *
 *  Returns 1 + the maximum document id in the index. It is the 
 *  document_id that will be used by the next document added to the index. If
 *  there are no deletions, this number also refers to the number of documents
 *  in the index.
 */
static VALUE
frt_sea_max_doc(VALUE self)
{
    GET_SEA();
    return INT2FIX(sea->max_doc(sea));
}