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qmf/Handle.h
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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  

Qpid C++ API Reference
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