// This code implementation is the intellectual property of
// the GEANT4 collaboration.
//
// By copying, distributing or modifying the Program (or any work
// based on the Program) you indicate your acceptance of this statement,
// and all its terms.
//

// GEANT4 tag 
//

#ifndef G4VUserDetectorConstruction_h
#define G4VUserDetectorConstruction_h 1

class G4VPhysicalVolume;

// class description:
//
//  This is the abstract base class of the user's mandatory initialization class
// for detector setup. It has only one pure virtual method Construct() which is
// invoked by G4RunManager when it's Initialize() method is invoked.
//  The Construct() method must return the G4VPhysicalVolume pointer which represents
// the world volume.
//

class G4VUserDetectorConstruction
{
  public:
    G4VUserDetectorConstruction();
    virtual ~G4VUserDetectorConstruction();

  public:
    virtual G4VPhysicalVolume* Construct() = 0;
};

#endif