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//
//
// $Id$
//
// 
// Abstract interface for GEANT4 Global Fast Simulation Manager.
// P. Mora de Freitas & M. Verderi 14/April/1999.
//
// Class description:
//
// G4GlobalFastSimulationManager is a "Singleton", i.e., only one instance 
// of it may exist. This is ensured by making the constructor private.
//
// G4VGlobalFastSimulationManager is an abstract interface for the
// G4GlobalFastSimulationManager one. It has the public access function
// GetConcreteInstance(), which is used to obtain a pointer to the concrete 
// G4GlobalFastSimulationManager, should it exist. After
//
// G4VGlobalFastSimulationManager* pVFSMan =  
//     G4VGlobalFastSimulationManager::GetConcreteInstance ();
//
// pVFSMan points to the real (concrete) G4GlobalFastSimulationManager if
// at least a parameterisation envelope exists, otherwise is zero.  
//
// Thus all code must be protected, for example by:
//   if (pVFSMan) 
//    G4FlavoredParallelWorld* =
//      pVFSMan -> GetFlavoredWorldForThis(p);
//

#ifndef G4VGLOBALFASTSIMULATIONMANAGER_HH
#define G4VGLOBALFASTSIMULATIONMANAGER_HH

class G4VFlavoredParallelWorld;
class G4ParticleDefinition;

class G4VGlobalFastSimulationManager
{

public:  // with description

  static G4VGlobalFastSimulationManager* GetConcreteInstance ();
    // Returns pointer to actual Global Fast Simulation manager if
    // at least a parameterisation envelope exists. Always check value.

  virtual ~G4VGlobalFastSimulationManager () {}

  virtual
  G4VFlavoredParallelWorld* GetFlavoredWorldForThis(G4ParticleDefinition*)=0;
    // VGlobalFastSimulationManager interface for visualisation.

protected:

  static void SetConcreteInstance (G4VGlobalFastSimulationManager*);
    // Sets the pointer to actual Global Fast Simulation manager.

  static G4VGlobalFastSimulationManager* fpConcreteInstance;  
    // Pointer to real G4GlobalFastSimulationManager.

};

#endif