VManagerBuilder.h

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#ifndef _det_VManagerBuilder_h_
#define _det_VManagerBuilder_h_

#include <det/VManager.h>

namespace det {

  class ManagerRegister;

  // derived-class templated virtual factory for Managers


  class VManagerBuilder {

  public:
    VManager&
    GetManager()
    {
      if (!fManager)
        fManager = CreateManager();
      return *fManager;
    }

  protected:
    VManagerBuilder() : fManager(0) { }
    virtual ~VManagerBuilder() { delete fManager; }

    // force derived classes to implement factory
    virtual VManager* CreateManager() const = 0;

  private:
    VManager* fManager;

    friend class det::ManagerRegister;

  };

}


#endif

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