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annotate engine/core/util/base/singleton.h @ 104:2c7101e4d81d

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* Removing old testmaps as they're not needed for the 2008.2 release
author mvbarracuda@33b003aa-7bff-0310-803a-e67f0ece8222
date Thu, 24 Jul 2008 10:18:44 +0000
parents 90005975cdbb
children
rev   line source
0
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1 /***************************************************************************
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2 * Copyright (C) 2005-2008 by the FIFE team *
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3 * http://www.fifengine.de *
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4 * This file is part of FIFE. *
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5 * *
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6 * FIFE is free software; you can redistribute it and/or *
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7 * modify it under the terms of the GNU Lesser General Public *
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8 * License as published by the Free Software Foundation; either *
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9 * version 2.1 of the License, or (at your option) any later version. *
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10 * *
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11 * This library is distributed in the hope that it will be useful, *
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
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14 * Lesser General Public License for more details. *
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15 * *
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16 * You should have received a copy of the GNU Lesser General Public *
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17 * License along with this library; if not, write to the *
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18 * Free Software Foundation, Inc., *
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19 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA *
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20 ***************************************************************************/
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21
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22 #ifndef FIFE_SINGLETON_H
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23 #define FIFE_SINGLETON_H
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24
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25 #define SINGLEFRIEND(classname) friend class FIFE::StaticSingleton<classname>; classname(); virtual ~classname();
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26
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27 // Standard C++ library includes
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28 #include <cassert>
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29
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30 // 3rd party library includes
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31
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32 // FIFE includes
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33 // These includes are split up in two parts, separated by one empty line
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34 // First block: files included from the FIFE root src directory
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35 // Second block: files included from the same folder
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36 #include "fifeclass.h"
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37
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38 namespace FIFE {
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39
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40 /** The "classic" Singleton.
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41 *
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42 * @see DynamicSingleton
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43 */
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44 template <typename T> class StaticSingleton: public FifeClass {
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45 public:
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46
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47 static T* instance() {
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48 static T inst;
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49 return &inst;
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50 }
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51
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52 protected:
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53
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54 StaticSingleton(): FifeClass() {
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55 }
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56
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57 virtual ~StaticSingleton() {
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58 }
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59
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60 private:
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61 StaticSingleton(const StaticSingleton<T>&): FifeClass() {}
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62 StaticSingleton<T>& operator=(const StaticSingleton<T>&) {
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63 return this;
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64 }
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65
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66 };
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67
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68 /** Another Singleton.
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69 *
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70 * This implementations needs to be created and destroyed explicitly.
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71 * That way the order of construction and destruction is well defined, so we don't
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72 * get those nasty static initialization/destruction order problems.
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73 *
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74 * Engine will create all standard FIFE Singletons when created (just call Engine::instance())
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75 * and destroy them on exit.
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76 *
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77 * Maybe we'll change this one day to use one of those funny NiftyCounter implementations.
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78 *
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79 * @see StaticSingleton
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80 * @see Engine
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81 */
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82 template <typename T> class DynamicSingleton: public FifeClass {
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83 public:
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84 static T* instance() {
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85 assert(m_instance);
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86 return m_instance;
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87 }
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88
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89 DynamicSingleton(): FifeClass() {
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90 assert(!m_instance);
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91 m_instance = static_cast<T*>(this);
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92 }
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93
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94 virtual ~DynamicSingleton() {
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95 m_instance = 0;
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96 }
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97
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98 private:
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99 static T* m_instance;
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100
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101 DynamicSingleton(const DynamicSingleton<T>&): FifeClass() {};
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102 DynamicSingleton<T&> operator=(const DynamicSingleton<T>&) {};
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103
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104 };
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105
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106 template <typename T> T* DynamicSingleton<T>::m_instance = 0;
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107
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108 }//FIFE
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109
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110 #endif