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qpid/framing/SequenceNumber.h
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00001 /*
00002  *
00003  * Licensed to the Apache Software Foundation (ASF) under one
00004  * or more contributor license agreements.  See the NOTICE file
00005  * distributed with this work for additional information
00006  * regarding copyright ownership.  The ASF licenses this file
00007  * to you under the Apache License, Version 2.0 (the
00008  * "License"); you may not use this file except in compliance
00009  * with the License.  You may obtain a copy of the License at
00010  *
00011  *   http://www.apache.org/licenses/LICENSE-2.0
00012  *
00013  * Unless required by applicable law or agreed to in writing,
00014  * software distributed under the License is distributed on an
00015  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
00016  * KIND, either express or implied.  See the License for the
00017  * specific language governing permissions and limitations
00018  * under the License.
00019  *
00020  */
00021 #ifndef _framing_SequenceNumber_h
00022 #define _framing_SequenceNumber_h
00023 
00024 #include "qpid/framing/amqp_types.h"
00025 #include <boost/operators.hpp>
00026 #include <iosfwd>
00027 #include "qpid/CommonImportExport.h"
00028 
00029 namespace qpid {
00030 namespace framing {
00031 
00032 class Buffer;
00033 
00037 class QPID_COMMON_CLASS_EXTERN SequenceNumber : public
00038 boost::equality_comparable<
00039     SequenceNumber, boost::less_than_comparable<
00040         SequenceNumber, boost::incrementable<
00041         SequenceNumber, boost::decrementable<SequenceNumber> > > >
00042 {
00043     int32_t value;
00044 
00045   public:
00046     SequenceNumber(uint32_t v=0) : value(v) {}
00047 
00048     SequenceNumber& operator++() { ++value; return *this; }
00049     SequenceNumber& operator--() { --value; return *this; }
00050     bool operator==(const SequenceNumber& other) const { return value == other.value; }
00051     bool operator<(const SequenceNumber& other) const { return (value - other.value) < 0; }
00052     uint32_t getValue() const { return uint32_t(value); }
00053     operator uint32_t() const { return uint32_t(value); }
00054 
00055     void encode(Buffer& buffer) const;
00056     void decode(Buffer& buffer);
00057     uint32_t encodedSize() const;
00058 
00059     template <class S> void serialize(S& s) { s(value); }
00060 
00061   friend inline int32_t operator-(const SequenceNumber& a, const SequenceNumber& b);
00062 };
00063 
00064 inline int32_t operator-(const SequenceNumber& a, const SequenceNumber& b) {
00065     return int32_t(a.value - b.value);
00066 }
00067 
00068 struct Window
00069 {
00070     SequenceNumber hwm;
00071     SequenceNumber lwm;
00072 };
00073 
00074 QPID_COMMON_EXTERN std::ostream& operator<<(std::ostream& o, const SequenceNumber& n);
00075 
00076 }} // namespace qpid::framing
00077 
00078 
00079 #endif

Qpid C++ API Reference
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