Crazy Eddies GUI System  0.7.8
CEGUISingleton.h
1 /***********************************************************************
2  filename: CEGUISingleton.h
3  created: 22/2/2004
4  author: Paul D Turner
5 
6  purpose: Singleton Base Class
7 *************************************************************************/
8 /***************************************************************************
9  * Copyright (C) 2004 - 2006 Paul D Turner & The CEGUI Development Team
10  *
11  * Permission is hereby granted, free of charge, to any person obtaining
12  * a copy of this software and associated documentation files (the
13  * "Software"), to deal in the Software without restriction, including
14  * without limitation the rights to use, copy, modify, merge, publish,
15  * distribute, sublicense, and/or sell copies of the Software, and to
16  * permit persons to whom the Software is furnished to do so, subject to
17  * the following conditions:
18  *
19  * The above copyright notice and this permission notice shall be
20  * included in all copies or substantial portions of the Software.
21  *
22  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
23  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
24  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
25  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
26  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
27  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
28  * OTHER DEALINGS IN THE SOFTWARE.
29  ***************************************************************************/
30 /*************************************************************************
31 
32  The code in this file is taken from article 1.3 in the the book:
33  Game Programming Gems from Charles River Media
34 
35 *************************************************************************/
36 #ifndef _CEGUISingleton_h_
37 #define _CEGUISingleton_h_
38 
39 #include "CEGUIBase.h"
40 #include <cassert>
41 
42 // Start of CEGUI namespace section
43 namespace CEGUI
44 {
45 /* Copyright (C) Scott Bilas, 2000.
46  * All rights reserved worldwide.
47  *
48  * This software is provided "as is" without express or implied
49  * warranties. You may freely copy and compile this source into
50  * applications you distribute provided that the copyright text
51  * below is included in the resulting source code, for example:
52  * "Portions Copyright (C) Scott Bilas, 2000"
53  */
54 
55 
56 template <typename T> class CEGUIEXPORT Singleton
57 {
58 protected:
59 // TODO: Come up with something better than this!
60 // TODO:
61 // TODO: This super-nasty piece of nastiness was put in for continued
62 // TODO: compatability with MSVC++ and MinGW - the latter apparently
63 // TODO: needs this.
64  static
65 #ifdef __MINGW32__
66  CEGUIEXPORT
67 #endif
68  T* ms_Singleton;
69 
70 public:
71  Singleton( void )
72  {
73  assert( !ms_Singleton );
74  ms_Singleton = static_cast<T*>(this);
75  }
76  ~Singleton( void )
77  { assert( ms_Singleton ); ms_Singleton = 0; }
78  static T& getSingleton( void )
79  { assert( ms_Singleton ); return ( *ms_Singleton ); }
80  static T* getSingletonPtr( void )
81  { return ( ms_Singleton ); }
82 
83 private:
84  Singleton& operator=(const Singleton&) { return this; }
85  Singleton(const Singleton&) {}
86 };
87 
88 } // End of CEGUI namespace section
89 
90 
91 
92 #endif // end of guard _CEGUISingleton_h_
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