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+/* bidirsortedset.vala
+ *
+ * Copyright (C) 2012 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>
+ */
+[GenericAccessors]
+public interface Gee.BidirSortedSet<G> : SortedSet<G> {
+ /**
+ * Returns a {@link BidirIterator} that can be used for bi-directional
+ * iteration over this sorted set.
+ *
+ * @return a {@link BidirIterator} over this sorted set
+ */
+ public abstract BidirIterator<G> bidir_iterator ();
+
+ /**
+ * The read-only view of this set.
+ */
+ public abstract new BidirSortedSet<G> read_only_view { owned get; }
+
+ /**
+ * Returns an immutable empty sorted set.
+ *
+ * @return an immutable empty sorted set
+ */
+ public static BidirSortedSet<G> empty<G> () {
+ return new TreeSet<G> ().read_only_view;
+ }
+}
+