RootDirectorySentry.h

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#ifndef art_Framework_Services_Optional_detail_RootDirectorySentry_h
#define art_Framework_Services_Optional_detail_RootDirectorySentry_h

//=================================================================
// RootDirectorySentry
//
// Description: Manages the status of the ROOT directory
//
// Usage: Construct an instance of this object in a routine in which you
//    expect a ROOT histogram to be automatically added to the current
//    directory in a file. The destructor will be sure to reset ROOT to
//    its previous setting.
//=================================================================

namespace art {
  namespace detail {

    class RootDirectorySentry {
    public:
      RootDirectorySentry();
      ~RootDirectorySentry() noexcept(false);

    private:
      RootDirectorySentry(RootDirectorySentry const&) = delete;
      RootDirectorySentry& operator=(RootDirectorySentry const&) = delete;
      bool status_;
    };

  } // detail
} // art

#endif /* art_Framework_Services_Optional_detail_RootDirectorySentry_h */