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SingletonT.hh
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//=============================================================================
//
// Implements a simple singleton template
//
//=============================================================================
#pragma once
//=== INCLUDES ================================================================
// OpenMesh
#include <OpenMesh/Core/System/config.h>
// STL
#include <stdexcept>
//== NAMESPACES ===============================================================
namespace OpenMesh {
//=== IMPLEMENTATION ==========================================================
template <typename T>
class SingletonT
{
public:
static T& Instance()
{
if (!pInstance__)
{
// check if singleton alive
if (destroyed__)
{
OnDeadReference();
}
// first time request -> initialize
else
{
Create();
}
}
return *pInstance__;
}
private:
// Disable constructors/assignment to enforce uniqueness
SingletonT();
SingletonT(const SingletonT&);
SingletonT& operator=(const SingletonT&);
// Create a new singleton and store its pointer
static void Create()
{
static T theInstance;
pInstance__ = &theInstance;
}
// Will be called if instance is accessed after its lifetime has expired
static void OnDeadReference()
{
throw std::runtime_error("[Singelton error] - Dead reference detected!\n");
}
virtual ~SingletonT()
{
pInstance__ = 0;
destroyed__ = true;
}
static T* pInstance__;
static bool destroyed__;
};
//=============================================================================
} // namespace OpenMesh
//=============================================================================
#if defined(OM_INCLUDE_TEMPLATES) && !defined(OPENMESH_SINGLETON_C)
# define OPENMESH_SINGLETON_TEMPLATES
# include "SingletonT_impl.hh"
#endif
//=============================================================================
OpenMesh
Contains all the mesh ingredients like the polygonal mesh, the triangle mesh, different mesh kernels ...
Definition MeshItems.hh:59
OpenMesh::SingletonT
A simple singleton template.
Definition SingletonT.hh:77
OpenMesh::SingletonT::Instance
static T & Instance()
Singleton access function.
Definition SingletonT.hh:86