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diff --git a/src/Queue.hxx b/src/Queue.hxx
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--- a/src/Queue.hxx
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@@ -1,378 +0,0 @@
-/*
- * Copyright (C) 2003-2014 The Music Player Daemon Project
- * http://www.musicpd.org
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program 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 General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License along
- * with this program; if not, write to the Free Software Foundation, Inc.,
- * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
- */
-
-#ifndef MPD_QUEUE_HXX
-#define MPD_QUEUE_HXX
-
-#include "Compiler.h"
-#include "IdTable.hxx"
-#include "util/LazyRandomEngine.hxx"
-
-#include <algorithm>
-
-#include <assert.h>
-#include <stdint.h>
-
-class DetachedSong;
-
-/**
- * A queue of songs.  This is the backend of the playlist: it contains
- * an ordered list of songs.
- *
- * Songs can be addressed in three possible ways:
- *
- * - the position in the queue
- * - the unique id (which stays the same, regardless of moves)
- * - the order number (which only differs from "position" in random mode)
- */
-struct Queue {
-	/**
-	 * reserve max_length * HASH_MULT elements in the id
-	 * number space
-	 */
-	static constexpr unsigned HASH_MULT = 4;
-
-	/**
-	 * One element of the queue: basically a song plus some queue specific
-	 * information attached.
-	 */
-	struct Item {
-		DetachedSong *song;
-
-		/** the unique id of this item in the queue */
-		unsigned id;
-
-		/** when was this item last changed? */
-		uint32_t version;
-
-		/**
-		 * The priority of this item, between 0 and 255.  High
-		 * priority value means that this song gets played first in
-		 * "random" mode.
-		 */
-		uint8_t priority;
-	};
-
-	/** configured maximum length of the queue */
-	unsigned max_length;
-
-	/** number of songs in the queue */
-	unsigned length;
-
-	/** the current version number */
-	uint32_t version;
-
-	/** all songs in "position" order */
-	Item *items;
-
-	/** map order numbers to positions */
-	unsigned *order;
-
-	/** map song ids to positions */
-	IdTable id_table;
-
-	/** repeat playback when the end of the queue has been
-	    reached? */
-	bool repeat;
-
-	/** play only current song. */
-	bool single;
-
-	/** remove each played files. */
-	bool consume;
-
-	/** play back songs in random order? */
-	bool random;
-
-	/** random number generator for shuffle and random mode */
-	LazyRandomEngine rand;
-
-	explicit Queue(unsigned max_length);
-
-	/**
-	 * Deinitializes a queue object.  It does not free the queue
-	 * pointer itself.
-	 */
-	~Queue();
-
-	Queue(const Queue &) = delete;
-	Queue &operator=(const Queue &) = delete;
-
-	unsigned GetLength() const {
-		assert(length <= max_length);
-
-		return length;
-	}
-
-	/**
-	 * Determine if the queue is empty, i.e. there are no songs.
-	 */
-	bool IsEmpty() const {
-		return length == 0;
-	}
-
-	/**
-	 * Determine if the maximum number of songs has been reached.
-	 */
-	bool IsFull() const {
-		assert(length <= max_length);
-
-		return length >= max_length;
-	}
-
-	/**
-	 * Is that a valid position number?
-	 */
-	bool IsValidPosition(unsigned position) const {
-		return position < length;
-	}
-
-	/**
-	 * Is that a valid order number?
-	 */
-	bool IsValidOrder(unsigned _order) const {
-		return _order < length;
-	}
-
-	int IdToPosition(unsigned id) const {
-		return id_table.IdToPosition(id);
-	}
-
-	int PositionToId(unsigned position) const
-	{
-		assert(position < length);
-
-		return items[position].id;
-	}
-
-	gcc_pure
-	unsigned OrderToPosition(unsigned _order) const {
-		assert(_order < length);
-
-		return order[_order];
-	}
-
-	gcc_pure
-	unsigned PositionToOrder(unsigned position) const {
-		assert(position < length);
-
-		for (unsigned i = 0;; ++i) {
-			assert(i < length);
-
-			if (order[i] == position)
-				return i;
-		}
-	}
-
-	gcc_pure
-	uint8_t GetPriorityAtPosition(unsigned position) const {
-		assert(position < length);
-
-		return items[position].priority;
-	}
-
-	const Item &GetOrderItem(unsigned i) const {
-		assert(IsValidOrder(i));
-
-		return items[OrderToPosition(i)];
-	}
-
-	uint8_t GetOrderPriority(unsigned i) const {
-		return GetOrderItem(i).priority;
-	}
-
-	/**
-	 * Returns the song at the specified position.
-	 */
-	DetachedSong &Get(unsigned position) const {
-		assert(position < length);
-
-		return *items[position].song;
-	}
-
-	/**
-	 * Returns the song at the specified order number.
-	 */
-	DetachedSong &GetOrder(unsigned _order) const {
-		return Get(OrderToPosition(_order));
-	}
-
-	/**
-	 * Is the song at the specified position newer than the specified
-	 * version?
-	 */
-	bool IsNewerAtPosition(unsigned position, uint32_t _version) const {
-		assert(position < length);
-
-		return _version > version ||
-			items[position].version >= _version ||
-			items[position].version == 0;
-	}
-
-	/**
-	 * Returns the order number following the specified one.  This takes
-	 * end of queue and "repeat" mode into account.
-	 *
-	 * @return the next order number, or -1 to stop playback
-	 */
-	gcc_pure
-	int GetNextOrder(unsigned order) const;
-
-	/**
-	 * Increments the queue's version number.  This handles integer
-	 * overflow well.
-	 */
-	void IncrementVersion();
-
-	/**
-	 * Marks the specified song as "modified".  Call
-	 * IncrementVersion() after all modifications have been made.
-	 * number.
-	 */
-	void ModifyAtPosition(unsigned position) {
-		assert(position < length);
-
-		items[position].version = version;
-	}
-
-	/**
-	 * Marks the specified song as "modified".  Call
-	 * IncrementVersion() after all modifications have been made.
-	 * number.
-	 */
-	void ModifyAtOrder(unsigned order);
-
-	/**
-	 * Appends a song to the queue and returns its position.  Prior to
-	 * that, the caller must check if the queue is already full.
-	 *
-	 * If a song is not in the database (determined by
-	 * Song::IsInDatabase()), it is freed when removed from the
-	 * queue.
-	 *
-	 * @param priority the priority of this new queue item
-	 */
-	unsigned Append(DetachedSong &&song, uint8_t priority);
-
-	/**
-	 * Swaps two songs, addressed by their position.
-	 */
-	void SwapPositions(unsigned position1, unsigned position2);
-
-	/**
-	 * Swaps two songs, addressed by their order number.
-	 */
-	void SwapOrders(unsigned order1, unsigned order2) {
-		std::swap(order[order1], order[order2]);
-	}
-
-	/**
-	 * Moves a song to a new position.
-	 */
-	void MovePostion(unsigned from, unsigned to);
-
-	/**
-	 * Moves a range of songs to a new position.
-	 */
-	void MoveRange(unsigned start, unsigned end, unsigned to);
-
-	/**
-	 * Removes a song from the playlist.
-	 */
-	void DeletePosition(unsigned position);
-
-	/**
-	 * Removes all songs from the playlist.
-	 */
-	void Clear();
-
-	/**
-	 * Initializes the "order" array, and restores "normal" order.
-	 */
-	void RestoreOrder() {
-		for (unsigned i = 0; i < length; ++i)
-			order[i] = i;
-	}
-
-	/**
-	 * Shuffle the order of items in the specified range, ignoring
-	 * their priorities.
-	 */
-	void ShuffleOrderRange(unsigned start, unsigned end);
-
-	/**
-	 * Shuffle the order of items in the specified range, taking their
-	 * priorities into account.
-	 */
-	void ShuffleOrderRangeWithPriority(unsigned start, unsigned end);
-
-	/**
-	 * Shuffles the virtual order of songs, but does not move them
-	 * physically.  This is used in random mode.
-	 */
-	void ShuffleOrder();
-
-	void ShuffleOrderFirst(unsigned start, unsigned end);
-
-	/**
-	 * Shuffles the virtual order of the last song in the specified
-	 * (order) range.  This is used in random mode after a song has been
-	 * appended by queue_append().
-	 */
-	void ShuffleOrderLast(unsigned start, unsigned end);
-
-	/**
-	 * Shuffles a (position) range in the queue.  The songs are physically
-	 * shuffled, not by using the "order" mapping.
-	 */
-	void ShuffleRange(unsigned start, unsigned end);
-
-	bool SetPriority(unsigned position, uint8_t priority, int after_order);
-
-	bool SetPriorityRange(unsigned start_position, unsigned end_position,
-			      uint8_t priority, int after_order);
-
-private:
-	/**
-	 * Moves a song to a new position in the "order" list.
-	 */
-	void MoveOrder(unsigned from_order, unsigned to_order);
-
-	void MoveItemTo(unsigned from, unsigned to) {
-		unsigned from_id = items[from].id;
-
-		items[to] = items[from];
-		items[to].version = version;
-		id_table.Move(from_id, to);
-	}
-
-	/**
-	 * Find the first item that has this specified priority or
-	 * higher.
-	 */
-	gcc_pure
-	unsigned FindPriorityOrder(unsigned start_order, uint8_t priority,
-				   unsigned exclude_order) const;
-
-	gcc_pure
-	unsigned CountSamePriority(unsigned start_order,
-				   uint8_t priority) const;
-};
-
-#endif