Apache Qpid - AMQP Messaging for Java JMS, C++, Python, Ruby, and .NET | Apache Qpid Documentation |
00001 #ifndef QMF_HANDLE_H 00002 #define QMF_HANDLE_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 00025 #include "qmf/ImportExport.h" 00026 00027 namespace qmf { 00028 00029 template <class> class PrivateImplRef; 00030 00038 template <class T> class Handle { 00039 public: 00040 00042 QMF_INLINE_EXTERN bool isValid() const { return impl; } 00043 00045 QMF_INLINE_EXTERN bool isNull() const { return !impl; } 00046 00048 QMF_INLINE_EXTERN operator bool() const { return impl; } 00049 00051 QMF_INLINE_EXTERN bool operator !() const { return !impl; } 00052 00053 void swap(Handle<T>& h) { T* t = h.impl; h.impl = impl; impl = t; } 00054 00055 protected: 00056 typedef T Impl; 00057 QMF_INLINE_EXTERN Handle() :impl() {} 00058 00059 // Not implemented,subclasses must implement. 00060 QMF_EXTERN Handle(const Handle&); 00061 QMF_EXTERN Handle& operator=(const Handle&); 00062 00063 Impl* impl; 00064 00065 friend class PrivateImplRef<T>; 00066 }; 00067 00068 } // namespace qmf 00069 00070 #endif