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SingletonT.hh
1 /* ========================================================================= *
2 * *
3 * OpenMesh *
4 * Copyright (c) 2001-2015, RWTH-Aachen University *
5 * Department of Computer Graphics and Multimedia *
6 * All rights reserved. *
7 * www.openmesh.org *
8 * *
9 *---------------------------------------------------------------------------*
10 * This file is part of OpenMesh. *
11 *---------------------------------------------------------------------------*
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14 * modification, are permitted provided that the following conditions *
15 * are met: *
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18 * this list of conditions and the following disclaimer. *
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25 * contributors may be used to endorse or promote products derived from *
26 * this software without specific prior written permission. *
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28 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS *
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40 * ========================================================================= */
41
42 /*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $Date$ *
46 * *
47 \*===========================================================================*/
48
49
50 //=============================================================================
51 //
52 // Implements a simple singleton template
53 //
54 //=============================================================================
55
56
57 #ifndef __SINGLETON_HH__
58 #define __SINGLETON_HH__
59
60
61 //=== INCLUDES ================================================================
62
63 // OpenMesh
64 #include <OpenMesh/Core/System/config.h>
65
66 // STL
67 #include <stdexcept>
68
69
70 //== NAMESPACES ===============================================================
71
72
73 namespace OpenMesh {
74
75
76 //=== IMPLEMENTATION ==========================================================
77
78
83 template <typename T>
84 class SingletonT
85 {
86 public:
87
94 static T& Instance()
95 {
96 if (!pInstance__)
97 {
98 // check if singleton alive
99 if (destroyed__)
100 {
101 OnDeadReference();
102 }
103 // first time request -> initialize
104 else
105 {
106 Create();
107 }
108 }
109 return *pInstance__;
110 }
111
112
113 private:
114
115 // Disable constructors/assignment to enforce uniqueness
116 SingletonT();
117 SingletonT(const SingletonT&);
118 SingletonT& operator=(const SingletonT&);
119
120 // Create a new singleton and store its pointer
121 static void Create()
122 {
123 static T theInstance;
124 pInstance__ = &theInstance;
125 }
126
127 // Will be called if instance is accessed after its lifetime has expired
128 static void OnDeadReference()
129 {
130 throw std::runtime_error("[Singelton error] - Dead reference detected!\n");
131 }
132
133 virtual ~SingletonT()
134 {
135 pInstance__ = 0;
136 destroyed__ = true;
137 }
138
139 static T* pInstance__;
140 static bool destroyed__;
141 };
142
143
144
145 //=============================================================================
146 } // namespace OpenMesh
147 //=============================================================================
148 #if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_SINGLETON_C)
149 # define OPENMESH_SINGLETON_TEMPLATES
150 # include "SingletonT.cc"
151 #endif
152 //=============================================================================
153 #endif // __SINGLETON_HH__
154 //=============================================================================
OpenMesh
Definition: MeshItems.hh:64
config.h
OpenMesh::SingletonT
Definition: SingletonT.hh:84
OpenMesh::SingletonT::Instance
static T & Instance()
Definition: SingletonT.hh:94