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+/* hashable.vala
+ *
+ * Copyright (C) 2010  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 <uzytkwonik2@gmail.com>
+ */
+
+/**
+ * This interface defines a hash function amongs instances of each class
+ * implementing it.
+ * 
+ * @see Comparable
+ */
+public interface Gee.Hashable<G> : Object {
+	/**
+	 * Computes hash for an objects. Two hashes of equal objects have to be
+	 * equal. Hash have to not change during lifetime of object.
+	 *
+	 * @return hash of an object
+	 */
+	public abstract uint hash ();
+
+	/**
+	 * Compares this object with the specifed object.
+	 *
+	 * @return true if objects are equal
+	 */
+	public abstract bool equal_to (G object);
+}