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diff --git a/src/DatabaseVisitor.hxx b/src/DatabaseVisitor.hxx
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+++ b/src/DatabaseVisitor.hxx
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+/*
+ * Copyright (C) 2003-2011 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_DATABASE_VISITOR_HXX
+#define MPD_DATABASE_VISITOR_HXX
+
+#include "gerror.h"
+
+#include <functional>
+
+struct directory;
+struct song;
+struct playlist_metadata;
+
+typedef std::function<bool(const directory &, GError **)> VisitDirectory;
+typedef std::function<bool(struct song &, GError **)> VisitSong;
+typedef std::function<bool(const playlist_metadata &, const directory &,
+			   GError **)> VisitPlaylist;
+
+#endif