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Handle.h
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1 #ifndef QMF_HANDLE_H
2 #define QMF_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 
25 #if !defined(QMF_USE_DEPRECATED_API) && !defined(qmf2_EXPORTS) && !defined(SWIG)
26 # error "The API defined in this file has been DEPRECATED and will be removed in the future."
27 # error "Define 'QMF_USE_DEPRECATED_API' to enable continued use of the API."
28 #endif
29 
30 #include "qmf/ImportExport.h"
31 
32 namespace qmf {
33 
34 template <class> class PrivateImplRef;
35 
43 template <class T> class Handle {
44  public:
45 
47  QMF_INLINE_EXTERN bool isValid() const { return impl; }
48 
50  QMF_INLINE_EXTERN bool isNull() const { return !impl; }
51 
53  QMF_INLINE_EXTERN operator bool() const { return impl; }
54 
56  QMF_INLINE_EXTERN bool operator !() const { return !impl; }
57 
58  void swap(Handle<T>& h) { T* t = h.impl; h.impl = impl; impl = t; }
59 
60  protected:
61  typedef T Impl;
63 
64  // Not implemented,subclasses must implement.
65  QMF_EXTERN Handle(const Handle&);
67 
69 
70  friend class PrivateImplRef<T>;
71 };
72 
73 } // namespace qmf
74 
75 #endif
#define QMF_INLINE_EXTERN
Definition: ImportExport.h:32
QMF_INLINE_EXTERN bool isValid() const
Definition: Handle.h:47
QMF_INLINE_EXTERN bool isNull() const
Definition: Handle.h:50
Handle & operator=(const Handle &)
#define QMF_EXTERN
Definition: ImportExport.h:30
void swap(Handle< T > &h)
Definition: Handle.h:58
QMF_INLINE_EXTERN Handle()
Definition: Handle.h:62
QMF_INLINE_EXTERN bool operator!() const
Operator ! supports idiom if (!handle) { do_if_handle_is_null(); }.
Definition: Handle.h:56
A handle is like a pointer: refers to an underlying implementation object.
Definition: Handle.h:43
Impl * impl
Definition: Handle.h:68

Qpid C++ API Reference
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