/*
 *  call-seq:
 *     index_reader.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_ir_max_doc(VALUE self)
{
    IndexReader *ir = (IndexReader *)DATA_PTR(self);
    return INT2FIX(ir->max_doc(ir));
}