libsmbios_c library
IObserver.h
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1 // vim:expandtab:autoindent:tabstop=4:shiftwidth=4:filetype=c:
2 /*
3  * Copyright (C) 2005 Dell Inc.
4  * by Michael Brown <Michael_E_Brown@dell.com>
5  * Licensed under the Open Software License version 2.1
6  *
7  * Alternatively, you can redistribute it and/or modify
8  * it under the terms of the GNU General Public License as published
9  * by the Free Software Foundation; either version 2 of the License,
10  * or (at your option) any later version.
11 
12  * This program is distributed in the hope that it will be useful, but
13  * WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
15  * See the GNU General Public License for more details.
16  */
17 
18 
19 #ifndef IOBSERVER_H
20 #define IOBSERVER_H
21 
22 // compat header should always be first header
23 #include "smbios/compat.h"
24 
25 #include <list>
26 
27 // abi_prefix should be last header included before declarations
29 
30 namespace observer
31 {
32  // forward declarations
33  class IObservable;
34 
35  class IObserver
36  {
37  public:
38  virtual ~IObserver();
39  virtual void update( const IObservable *whatChanged, void *param = 0 ) = 0;
40  protected:
41  IObserver();
42  };
43 
45  {
46  public:
47  virtual ~IObservable();
48 
49  virtual void attach( IObserver * ) const;
50  virtual void detach( IObserver * ) const;
51  virtual void notify( void *param = 0 ) const;
52  protected:
53  IObservable();
54 
55  private:
56  mutable std::list<IObserver *> observers;
57  };
58 
59 }
60 
61 // always should be last thing in header file
63 
64 #endif /* IOBSERVER_H */