csingletonmanager.h

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#ifndef CSINGLETONMANAGER_H
#define CSINGLETONMANAGER_H

#include <assert.h>

template<class T> class CSingletonFactory;

template<class T> class CSingletonManager {
private:
  static T *unique_instance;

  CSingletonManager<T>();

public:
  static void init(CSingletonFactory<T> *f) { unique_instance = f->make_singleton(); delete f; }

  static void deinit() { delete unique_instance; unique_instance = 0; }

  static T &get_instance() { assert(unique_instance != 0); return *unique_instance; }
};

template<class T> class CSingletonFactory {
 private:
  friend class CSingletonManager<T>;

  virtual T *make_singleton() = 0;
};

#endif

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