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diff --git a/gee/readonlybidirlist.vala b/gee/readonlybidirlist.vala
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+/* readonlybidirlist.vala
+ *
+ * Copyright (C) 2011  Maciej Piechotka
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
+ *
+ * Author:
+ * 	Maciej Piechotka <uzytkownik2@gmail.com>
+ */
+
+internal class Gee.ReadOnlyBidirList<G> : Gee.ReadOnlyList<G>, BidirList<G> {
+
+	/**
+	 * Constructs a read-only list that mirrors the content of the specified
+	 * list.
+	 *
+	 * @param list the list to decorate.
+	 */
+	public ReadOnlyBidirList (BidirList<G> list) {
+		base (list);
+	}
+
+	/**
+	 * {@inheritDoc}
+	 */
+	public BidirListIterator<G> bidir_list_iterator () {
+		return new Iterator<G> (((Gee.BidirList<G>) _collection).bidir_list_iterator ());
+	}
+
+	/**
+	 * The read-only view of this list.
+	 */
+	public virtual new BidirList<G> read_only_view { owned get { return this; } }
+
+	private class Iterator<G> : ReadOnlyList.Iterator<G>, BidirIterator<G>, BidirListIterator<G> {
+		public Iterator (ListIterator<G> iterator) {
+			base (iterator);
+		}
+
+		public bool previous () {
+			return ((BidirIterator<G>) _iter).previous ();
+		}
+
+		public bool has_previous () {
+			return ((BidirIterator<G>) _iter).has_previous ();
+		}
+
+		public bool first () {
+			return ((BidirIterator<G>) _iter).first ();
+		}
+
+		public bool last () {
+			return ((BidirIterator<G>) _iter).last ();
+		}
+
+		public void insert (G item) {
+			assert_not_reached ();
+		}
+	}
+}
+