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SingletonT.hh
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42/*===========================================================================*\
43 * *
44 * $Revision$ *
45 * $Date$ *
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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
73namespace OpenMesh {
74
75
76//=== IMPLEMENTATION ==========================================================
77
78
83template <typename T>
85{
86public:
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
113private:
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//=============================================================================
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition: MeshItems.hh:64
A simple singleton template.
Definition: SingletonT.hh:85
static T & Instance()
Singleton access function.
Definition: SingletonT.hh:94

Project OpenMesh, ©  Computer Graphics Group, RWTH Aachen. Documentation generated using doxygen .