mitlib.pub/MITLIB/SecsGemDll/SGManagerSingleton.h

#pragma once
#include "ISGManager.h"
#ifdef SECSGEM_EXPORTS
#define SECSGEM_DLL __declspec(dllexport)
#else
#define SECSGEM_DLL __declspec(dllimport)
#endif

/*
 * This is a singleton that contains the one and only SGManager
 */
class SECSGEM_DLL CSGManagerSingleton
{
private:
    CSGManagerSingleton(void);
    ~CSGManagerSingleton(void);
/* The below copy constructor and assignment operators are
 * not implemented but by defining them here their default
 * implementation will not be used.
 */
    static CMutex      m_mutex;
    static ISGManager *m_pInstance;
    CSGManagerSingleton(const CSGManagerSingleton&);
    void operator =(const CSGManagerSingleton&);
public:
    static ISGManager& Instance();
    static void        Destroy();
};