/*
 *  call-seq:
 *     index_reader.delete(doc_id) -> index_reader
 *
 *  Delete document referenced internally by document id +doc_id+. The
 *  document_id is the number used to reference documents in the index and is
 *  returned by search methods.
 */
static VALUE
frt_ir_delete(VALUE self, VALUE rdoc_id)
{
    IndexReader *ir = (IndexReader *)DATA_PTR(self);
    ir_delete_doc(ir, FIX2INT(rdoc_id));
    return self;
}