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+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is Mozilla XPCOM.
+ *
+ * The Initial Developer of the Original Code is
+ * Benjamin Smedberg <benjamin@smedbergs.us>.
+ *
+ * Portions created by the Initial Developer are Copyright (C) 2005
+ * the Mozilla Foundation <http://www.mozilla.org/>. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsISupports.idl"
+
+/**
+ * Represents an object that can be stored in a hashtable.
+ */
+
+[scriptable, uuid(17e595fa-b57a-4933-bd0f-b1812e8ab188)]
+interface nsIHashable : nsISupports
+{
+ /**
+ * Is this object the equivalent of the other object?
+ */
+ boolean equals(in nsIHashable aOther);
+
+ /**
+ * A generated hashcode for this object. Objects that are equivalent
+ * must have the same hash code. Getting this property should never
+ * throw an exception!
+ */
+ readonly attribute unsigned long hashCode;
+};