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+/**
+ * @file llcommonutils.h
+ * @brief Common utils
+ *
+ * $LicenseInfo:firstyear=2010&license=viewergpl$
+ *
+ * Copyright (c) 2010, Linden Research, Inc.
+ *
+ * Second Life Viewer Source Code
+ * The source code in this file ("Source Code") is provided by Linden Lab
+ * to you under the terms of the GNU General Public License, version 2.0
+ * ("GPL"), unless you have obtained a separate licensing agreement
+ * ("Other License"), formally executed by you and Linden Lab.  Terms of
+ * the GPL can be found in doc/GPL-license.txt in this distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
+ *
+ * There are special exceptions to the terms and conditions of the GPL as
+ * it is applied to this Source Code. View the full text of the exception
+ * in the file doc/FLOSS-exception.txt in this software distribution, or
+ * online at http://secondlifegrid.net/programs/open_source/licensing/flossexception
+ *
+ * By copying, modifying or distributing this software, you acknowledge
+ * that you have read and understood your obligations described above,
+ * and agree to abide by those obligations.
+ *
+ * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
+ * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
+ * COMPLETENESS OR PERFORMANCE.
+ * $/LicenseInfo$
+ */
+
+#ifndef LL_LLCOMMONUTILS_H
+#define LL_LLCOMMONUTILS_H
+
+namespace LLCommonUtils
+{
+	/**
+	 * Computes difference between 'vnew' and 'vcur' vectors.
+	 * Items present in 'vnew' and missing in 'vcur' are treated as added and are copied into 'vadded'
+	 * Items missing in 'vnew' and present in 'vcur' are treated as removed and are copied into 'vremoved'
+	 *
+	 * @param vnew[in] - incoming IDs
+	 * @param vcur[in] - current IDs
+	 * @param vadded[out] - difference between incoming and current IDS - added IDs
+	 * @param vremoved[out] - difference between incoming and current IDS - removed IDs
+	 */
+	LL_COMMON_API void computeDifference(
+		const uuid_vec_t& vnew,
+		const uuid_vec_t& vcur,
+		uuid_vec_t& vadded,
+		uuid_vec_t& vremoved);
+};
+
+#endif //LL_LLCOMMONUTILS_H
+
+// EOF