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 // * the Geant4 Collaboration.  It is provided  under  the terms  and *
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 // 
 // G4TouchableHistory
 //
 // Class description:
 //
 // Object representing a touchable detector element, and its history in the
 // geometrical hierarchy, including its net resultant local->global transform.
 //
 // Touchables are objects capable of maintaining an
 // association between parts of the geometrical hierarchy (volumes
 // &/or solids) and their resultant transformation.
 //
 // Utilisation:
 // -----------
 // A touchable is a geometrical volume (solid) which has a unique
 // placement in a detector description. It is an abstract base class which 
 // can be implemented in a variety of ways. Each way must provide the 
 // capabilities of obtaining the transformation and solid that is described
 // by the touchable. 
 //
 // All touchable implementations must respond to the two following "requests": 
 //
 //   1) GetTranslation and GetRotation that return the components of the
 //      volume's transformation.
 //
 //   2) GetSolid that gives the solid of this touchable.
 //
 //
 // Additional capabilities are available from implementations with more
 // information. These have a default implementation that causes an exception. 
 //
 // Several capabilities are available from touchables with physical volumes:
 //
 //   3) GetVolume gives the physical volume.
 //
 //   4) GetReplicaNumber or GetCopyNumber gives the copy number of the
 //      physical volume, either if it is replicated or not.
 //
 // Touchables that store volume hierarchy (history) have the whole stack of
 // parent volumes available. Thus it is possible to add a little more state
 // in order to extend its functionality. We add a "pointer" to a level and a
 // member function to move the level in this stack. Then calling the above
 // member functions for another level, the information for that level can be
 // retrieved.  
 //
 // The top of the history tree is, by convention, the world volume.
 //
 //   5) GetHistoryDepth gives the depth of the history tree.
 //
 //   6) GetReplicaNumber/GetCopyNumber, GetVolume, GetTranslation and
 //      GetRotation each can be called with a depth argument.
 //      They return the value of the respective level of the touchable.
 // 
 //   7) MoveUpHistory(num) moves the current pointer inside the touchable
 //      to point "num" levels up the history tree. Thus, eg, calling 
 //      it with num=1 will cause the internal pointer to move to the mother 
 //      of the current volume.
 //      NOTE: this method MODIFIES the touchable.
 //   
 // An update method, with different arguments is available, so that the
 // information in a touchable can be updated: 
 //
 //   8) UpdateYourself takes a physical volume pointer and can additionally
 //      take a NavigationHistory.
 
 // Created: Paul Kent, August 1996
 // ----------------------------------------------------------------------
 #ifndef G4TOUCHABLEHISTORY_HH
 #define G4TOUCHABLEHISTORY_HH
 
 #include "G4NavigationHistory.hh"
 #include "G4Allocator.hh"
 #include "G4LogicalVolume.hh"
 #include "G4ThreeVector.hh"
 #include "G4RotationMatrix.hh"
 
 #include "geomwdefs.hh"
 
 class G4TouchableHistory
 {
   public:
 
     G4TouchableHistory(); 
       // The default constructor produces a touchable-history of 
       // 'zero-depth', ie an "unphysical" and not very unusable one.
       // It is for initialisation only.  
 
     G4TouchableHistory( const G4NavigationHistory& history );
       // Copy constructor
 
     virtual ~G4TouchableHistory();
       // Destructor
 
     inline virtual G4VPhysicalVolume* GetVolume( G4int depth = 0 ) const;
     inline virtual G4VSolid* GetSolid( G4int depth = 0 ) const;
     virtual const G4ThreeVector& GetTranslation( G4int depth = 0 ) const;
     virtual const G4RotationMatrix* GetRotation( G4int depth = 0 ) const;
 
     inline virtual G4int GetReplicaNumber( G4int depth = 0 ) const;
     inline G4int GetCopyNumber( G4int depth = 0 ) const;
     inline virtual G4int GetHistoryDepth()  const;
     virtual G4int MoveUpHistory( G4int num_levels = 1 );
       // Access methods for touchables with history
 
     virtual void  UpdateYourself( G4VPhysicalVolume* pPhysVol,
                             const G4NavigationHistory* history = nullptr ); 
       // Update methods for touchables with history
 
     inline virtual const G4NavigationHistory* GetHistory() const;
       // Internal: used in G4Navigator::LocateGlobalPointAndSetup().
 
     inline void* operator new(std::size_t);
     inline void operator delete(void* aTH);
       // Override "new" and "delete" to use "G4Allocator".
 
    private:
 
     inline G4int CalculateHistoryIndex( G4int stackDepth ) const;
 
     G4RotationMatrix frot;
     G4ThreeVector ftlate;
     G4NavigationHistory fhistory;
 };
 
 #include "G4TouchableHistory.icc"
 
 #endif

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