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+/** 
+ * @file llrecentpeople.h
+ * @brief List of people with which the user has recently interacted.
+ *
+ * $LicenseInfo:firstyear=2009&license=viewergpl$
+ * 
+ * Copyright (c) 2009, 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_LLRECENTPEOPLE_H
+#define LL_LLRECENTPEOPLE_H
+
+#include "llevent.h"
+#include "llsingleton.h"
+#include "lluuid.h"
+
+#include <vector>
+#include <set>
+#include <boost/signals2.hpp>
+
+/**
+ * List of people the agent recently interacted with.
+ * 
+ * Includes: anyone with whom the user IM'd or called
+ * (1:1 and ad-hoc but not SL Group chat),
+ * anyone with whom the user has had a transaction
+ * (inventory offer, friend request, etc),
+ * and anyone that has chatted within chat range of the user in-world. 
+ * 
+ *TODO: purge least recently added items? 
+ */
+class LLRecentPeople: public LLSingleton<LLRecentPeople>, public LLOldEvents::LLSimpleListener
+{
+	LOG_CLASS(LLRecentPeople);
+public:
+	typedef boost::signals2::signal<void ()> signal_t;
+	
+	/**
+	 * Add specified avatar to the list if it's not there already.
+	 *
+	 * @param id avatar to add.
+	 * @return false if the avatar is in the list already, true otherwisr
+	 */
+	bool add(const LLUUID& id);
+
+	/**
+	 * @param id avatar to search.
+	 * @return true if the avatar is in the list, false otherwise.
+	 */
+	bool contains(const LLUUID& id) const;
+
+	/**
+	 * Get the whole list.
+	 * 
+	 * @param result where to put the result.
+	 */
+	void get(std::vector<LLUUID>& result) const;
+
+	/**
+	 * Set callback to be called when the list changed.
+	 * 
+	 * Multiple callbacks can be set.
+	 * 
+	 * @return no connection; use boost::bind + boost::signals2::trackable to disconnect slots.
+	 */
+	void setChangedCallback(const signal_t::slot_type& cb) { mChangedSignal.connect(cb); }
+
+	/**
+	 * LLSimpleListener interface.
+	 */
+	/*virtual*/ bool handleEvent(LLPointer<LLOldEvents::LLEvent> event, const LLSD& userdata);
+
+private:
+	std::set<LLUUID>	mList;
+	signal_t			mChangedSignal;
+};
+
+#endif // LL_LLRECENTPEOPLE_H