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diff --git a/cpp/lib/broker/AccumulatedAck.h b/cpp/lib/broker/AccumulatedAck.h
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+++ b/cpp/lib/broker/AccumulatedAck.h
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+/*
+ *
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ * 
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ *
+ */
+#ifndef _AccumulatedAck_
+#define _AccumulatedAck_
+
+#include <algorithm>
+#include <functional>
+#include <list>
+
+namespace qpid {
+    namespace broker {
+        /**
+         * Keeps an accumulated record of acked messages (by delivery
+         * tag).
+         */
+        struct AccumulatedAck{
+            /**
+             * If not zero, then everything up to this value has been
+             * acked.
+             */
+            u_int64_t range;
+            /**
+             * List of individually acked messages that are not
+             * included in the range marked by 'range'.
+             */
+            std::list<u_int64_t> individual;
+
+            void update(u_int64_t tag, bool multiple);
+            void consolidate();
+            void clear();
+            bool covers(u_int64_t tag) const;
+        };
+    }
+}
+
+
+#endif