Apache Qpid C++ API
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qpid/framing/Invoker.h

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00001 #ifndef QPID_FRAMING_INVOKER_H
00002 #define QPID_FRAMING_INVOKER_H
00003 
00004 /*
00005  *
00006  * Licensed to the Apache Software Foundation (ASF) under one
00007  * or more contributor license agreements.  See the NOTICE file
00008  * distributed with this work for additional information
00009  * regarding copyright ownership.  The ASF licenses this file
00010  * to you under the Apache License, Version 2.0 (the
00011  * "License"); you may not use this file except in compliance
00012  * with the License.  You may obtain a copy of the License at
00013  * 
00014  *   http://www.apache.org/licenses/LICENSE-2.0
00015  * 
00016  * Unless required by applicable law or agreed to in writing,
00017  * software distributed under the License is distributed on an
00018  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
00019  * KIND, either express or implied.  See the License for the
00020  * specific language governing permissions and limitations
00021  * under the License.
00022  *
00023  */
00024 #include "qpid/framing/AMQMethodBody.h"
00025 #include "qpid/framing/MethodBodyDefaultVisitor.h"
00026 #include "qpid/framing/StructHelper.h"
00027 
00028 #include <boost/optional.hpp>
00029 
00030 namespace qpid {
00031 namespace framing {
00032 
00033 class AMQMethodBody;
00034 
00038 class Invoker: public MethodBodyDefaultVisitor, protected StructHelper
00039 {
00040   public:
00041     struct Result {
00042       public:
00043         Result() : handled(false) {}
00044         const std::string& getResult() const { return result; }
00045         bool hasResult() const { return !result.empty(); }
00046         bool wasHandled() const { return handled; }
00047         operator bool() const { return handled; }
00048 
00049         std::string result;
00050         bool handled;
00051     };
00052 
00053     void defaultVisit(const AMQMethodBody&) {}
00054     Result getResult() const { return result; }
00055 
00056   protected:
00057     Result result;
00058 };
00059 
00064 template <class Invocable>
00065 Invoker::Result invoke(Invocable& target, const AMQMethodBody& body) {
00066     typename Invocable::Invoker invoker(target);
00067     body.accept(invoker);
00068     return invoker.getResult();
00069 }
00070 
00075 template <class Invocable>
00076 Invoker::Result invoke(Invocable& target, const AMQBody& body) {
00077     typename Invocable::Invoker invoker(target);
00078     const AMQMethodBody* method = body.getMethod();
00079     if (method)
00080         method->accept(invoker);
00081     return invoker.getResult();
00082 }
00083 
00084 }} // namespace qpid::framing
00085 
00086 #endif  

Qpid C++ API Reference
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