qpid/framing/SequenceNumber.h Source File

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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     QPID_COMMON_EXTERN void encode(Buffer& buffer) const;
    00056     QPID_COMMON_EXTERN void decode(Buffer& buffer);
    00057     QPID_COMMON_EXTERN 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