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diff --git a/qpid/cpp/src/qpid/broker/MessageMap.h b/qpid/cpp/src/qpid/broker/MessageMap.h
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+++ b/qpid/cpp/src/qpid/broker/MessageMap.h
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+#ifndef QPID_BROKER_MESSAGEMAP_H
+#define QPID_BROKER_MESSAGEMAP_H
+
+/*
+ *
+ * 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.
+ *
+ */
+#include "qpid/broker/Messages.h"
+#include "qpid/framing/SequenceNumber.h"
+#include <map>
+#include <string>
+
+namespace qpid {
+namespace broker {
+
+/**
+ * Provides a last value queue behaviour, whereby a messages replace
+ * any previous message with the same value for a defined property
+ * (i.e. the key).
+ */
+class MessageMap : public Messages
+{
+  public:
+    MessageMap(const std::string& key);
+    virtual ~MessageMap() {}
+
+    size_t size();
+    bool empty();
+
+    void reinsert(const QueuedMessage&);
+    virtual bool remove(const framing::SequenceNumber&, QueuedMessage&);
+    bool find(const framing::SequenceNumber&, QueuedMessage&);
+    virtual bool next(const framing::SequenceNumber&, QueuedMessage&);
+
+    QueuedMessage& front();
+    void pop();
+    bool pop(QueuedMessage&);
+    virtual bool push(const QueuedMessage& added, QueuedMessage& removed);
+
+    void foreach(Functor);
+    virtual void removeIf(Predicate);
+
+  protected:
+    typedef std::map<std::string, QueuedMessage> Index;
+    typedef std::map<framing::SequenceNumber, QueuedMessage> Ordering;
+    const std::string key;
+    Index index;
+    Ordering messages;
+
+    std::string getKey(const QueuedMessage&);
+    virtual const QueuedMessage& replace(const QueuedMessage&, const QueuedMessage&);
+    void erase(Ordering::iterator);
+};
+}} // namespace qpid::broker
+
+#endif  /*!QPID_BROKER_MESSAGEMAP_H*/