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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 #if !defined(QMF_USE_DEPRECATED_API) && !defined(qmf2_EXPORTS) && !defined(SWIG)
00026 #  error "The API defined in this file has been DEPRECATED and will be removed in the future."
00027 #  error "Define 'QMF_USE_DEPRECATED_API' to enable continued use of the API."
00028 #endif
00029 
00030 #include "qmf/ImportExport.h"
00031 
00032 namespace qmf {
00033 
00034 template <class> class PrivateImplRef;
00035 
00043 template <class T> class Handle {
00044   public:
00045 
00047     QMF_INLINE_EXTERN bool isValid() const { return impl; }
00048 
00050     QMF_INLINE_EXTERN bool isNull() const { return !impl; }
00051 
00053     QMF_INLINE_EXTERN operator bool() const { return impl; }
00054 
00056     QMF_INLINE_EXTERN bool operator !() const { return !impl; }
00057 
00058     void swap(Handle<T>& h) { T* t = h.impl; h.impl = impl; impl = t; }
00059 
00060   protected:
00061     typedef T Impl;
00062     QMF_INLINE_EXTERN Handle() :impl() {}
00063 
00064     // Not implemented,subclasses must implement.
00065     QMF_EXTERN Handle(const Handle&);
00066     QMF_EXTERN Handle& operator=(const Handle&);
00067 
00068     Impl* impl;
00069 
00070   friend class PrivateImplRef<T>;
00071 };
00072 
00073 } // namespace qmf
00074 
00075 #endif  

Qpid C++ API Reference
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