Qpid C++ Messaging API  0.24
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Handle.h
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1 #ifndef QPID_MESSAGING_HANDLE_H
2 #define QPID_MESSAGING_HANDLE_H
3 
4 /*
5  *
6  * Licensed to the Apache Software Foundation (ASF) under one
7  * or more contributor license agreements. See the NOTICE file
8  * distributed with this work for additional information
9  * regarding copyright ownership. The ASF licenses this file
10  * to you under the Apache License, Version 2.0 (the
11  * "License"); you may not use this file except in compliance
12  * with the License. You may obtain a copy of the License at
13  *
14  * http://www.apache.org/licenses/LICENSE-2.0
15  *
16  * Unless required by applicable law or agreed to in writing,
17  * software distributed under the License is distributed on an
18  * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
19  * KIND, either express or implied. See the License for the
20  * specific language governing permissions and limitations
21  * under the License.
22  *
23  */
24 
26 
27 namespace qpid {
28 namespace messaging {
29 
30 template <class> class PrivateImplRef;
31 
39 template <class T> class Handle {
40  public:
41 
43  QPID_MESSAGING_INLINE_EXTERN bool isValid() const { return impl; }
44 
46  QPID_MESSAGING_INLINE_EXTERN bool isNull() const { return !impl; }
47 
49  QPID_MESSAGING_INLINE_EXTERN operator bool() const { return impl; }
50 
52  QPID_MESSAGING_INLINE_EXTERN bool operator !() const { return !impl; }
53 
54  void swap(Handle<T>& h) { T* t = h.impl; h.impl = impl; impl = t; }
55 
56  protected:
57  typedef T Impl;
59 
60  // Not implemented,subclasses must implement.
63 
65 
66  friend class PrivateImplRef<T>;
67 };
68 
69 }} // namespace qpid::messaging
70 
71 #endif