Singleton.h

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#ifndef DETECTOR_DESCRIPTION_CORE_DDI_SINGLETON_H
#define DETECTOR_DESCRIPTION_CORE_DDI_SINGLETON_H

namespace DDI {
  template <class I>
  class Singleton {
  public:
    typedef I value_type;
    virtual ~Singleton() = default;
    static value_type& instance();

    Singleton(void) = delete;
    Singleton(const Singleton&) = delete;
    Singleton& operator=(const Singleton&) = delete;
  };
}  // namespace DDI

#endif