1 files changed, 79 insertions, 0 deletions
diff --git a/qpid/cpp/include/qpid/framing/SequenceNumber.h b/qpid/cpp/include/qpid/framing/SequenceNumber.h
new file mode 100644
index 0000000000..eed15a4b75
--- /dev/null
+++ b/qpid/cpp/include/qpid/framing/SequenceNumber.h
@@ -0,0 +1,79 @@
+/*
+ *
+ * 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 _framing_SequenceNumber_h
+#define _framing_SequenceNumber_h
+
+#include "qpid/framing/amqp_types.h"
+#include <boost/operators.hpp>
+#include <iosfwd>
+#include "qpid/CommonImportExport.h"
+
+namespace qpid {
+namespace framing {
+
+class Buffer;
+
+/**
+ * 4-byte sequence number that 'wraps around'.
+ */
+class QPID_COMMON_CLASS_EXTERN SequenceNumber : public
+boost::equality_comparable<
+    SequenceNumber, boost::less_than_comparable<
+        SequenceNumber, boost::incrementable<
+        SequenceNumber, boost::decrementable<SequenceNumber> > > >
+{
+    int32_t value;
+
+  public:
+    SequenceNumber(uint32_t v=0) : value(v) {}
+
+    SequenceNumber& operator++() { ++value; return *this; }
+    SequenceNumber& operator--() { --value; return *this; }
+    bool operator==(const SequenceNumber& other) const { return value == other.value; }
+    bool operator<(const SequenceNumber& other) const { return (value - other.value) < 0; }
+    uint32_t getValue() const { return uint32_t(value); }
+    operator uint32_t() const { return uint32_t(value); }
+
+    void encode(Buffer& buffer) const;
+    void decode(Buffer& buffer);
+    uint32_t encodedSize() const;
+
+    template <class S> void serialize(S& s) { s(value); }
+
+  friend inline int32_t operator-(const SequenceNumber& a, const SequenceNumber& b);
+};
+
+inline int32_t operator-(const SequenceNumber& a, const SequenceNumber& b) {
+    return int32_t(a.value - b.value);
+}
+
+struct Window
+{
+    SequenceNumber hwm;
+    SequenceNumber lwm;
+};
+
+QPID_COMMON_EXTERN std::ostream& operator<<(std::ostream& o, const SequenceNumber& n);
+
+}} // namespace qpid::framing
+
+
+#endif