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diff --git a/src/modules/UserListManager/UserListDiff.h b/src/modules/UserListManager/UserListDiff.h
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+/*
+ * UserListDiff.h
+ *
+ * Copyright (C) 2009 Matthias Schiffer <matthias@gamezock.de>
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU Lesser General Public License as published by the
+ * Free Software Foundation, either version 3 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 Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License along
+ * with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MAD_MODULES_USERLISTMANAGER_USERLISTDIFF_H_
+#define MAD_MODULES_USERLISTMANAGER_USERLISTDIFF_H_
+
+#include "../export.h"
+
+#include "UserListEntry.h"
+#include <Core/Exception.h>
+
+#include <set>
+
+namespace Mad {
+namespace Modules {
+namespace UserListManager {
+
+class UserList;
+
+class MAD_MODULE_EXPORT UserListDiff {
+  private:
+    std::set<UserListEntry> addedUsers;
+    std::set<UserListEntry> deletedUsers;
+    std::set<UserListEntry> unchangedUsers;
+
+  public:
+    UserListDiff() {}
+    UserListDiff(const UserList *oldList, const UserList *newList);
+
+    void invert() {
+      addedUsers.swap(deletedUsers);
+    }
+
+    const std::set<UserListEntry>& getAddedUsers() const {
+      return addedUsers;
+    }
+
+    const std::set<UserListEntry>& getDeletedUsers() const {
+      return deletedUsers;
+    }
+
+    const std::set<UserListEntry>& getUnchangedUsers() const {
+      return unchangedUsers;
+    }
+
+    bool insertAddedUser(UserListEntry user) {
+      if(deletedUsers.count(user) || unchangedUsers.count(user))
+        return false;
+
+      return addedUsers.insert(user).second;
+    }
+
+    bool insertDeletedUser(UserListEntry user) {
+      if(addedUsers.count(user) || unchangedUsers.count(user))
+        return false;
+
+      return deletedUsers.insert(user).second;
+    }
+
+    bool insertUnchangedUser(UserListEntry user) {
+      if(addedUsers.count(user) || deletedUsers.count(user))
+        return false;
+
+      return unchangedUsers.insert(user).second;
+    }
+};
+
+}
+}
+}
+
+#endif /* MAD_MODULES_USERLISTMANAGER_USERLISTDIFF_H_ */