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// $Id:$
//
// Class G4MTRandGauss
// 
// Modified version with MT extensions
// of corresponding CLHEP class RandGauss

// --------------------------------------------------------------------
#ifndef G4MTRandGauss_h
#define G4MTRandGauss_h 1

#include "G4MTHepRandom.hh"

class G4MTRandGauss : public G4MTHepRandom
{

public:

  inline G4MTRandGauss ( CLHEP::HepRandomEngine& anEngine, G4double mean=0.0,
                                                G4double stdDev=1.0 );
  inline G4MTRandGauss ( CLHEP::HepRandomEngine* anEngine, G4double mean=0.0,
                                                G4double stdDev=1.0 );
  // These constructors should be used to instantiate a G4MTRandGauss
  // distribution object defining a local engine for it.
  // The static generator will be skipped using the non-static methods
  // defined below.
  // If the engine is passed by pointer the corresponding engine object
  // will be deleted by the G4MTRandGauss destructor.
  // If the engine is passed by reference the corresponding engine object
  // will not be deleted by the G4MTRandGauss destructor.

  virtual ~G4MTRandGauss();
  // Destructor

  // Static methods to shoot random values using the static generator

  static  G4double shoot();

  static  inline G4double shoot( G4double mean, G4double stdDev );

  static  void shootArray ( const G4int size, G4double* vect,
                            G4double mean=0.0, G4double stdDev=1.0 );

  //  Static methods to shoot random values using a given engine
  //  by-passing the static generator.

  static  G4double shoot( CLHEP::HepRandomEngine* anEngine );

  static  inline G4double shoot( CLHEP::HepRandomEngine* anEngine, 
                                  G4double mean, G4double stdDev );

  static  void shootArray ( CLHEP::HepRandomEngine* anEngine, const G4int size,
                            G4double* vect, G4double mean=0.0,
                            G4double stdDev=1.0 );

  //  Methods using the localEngine to shoot random values, by-passing
  //  the static generator.

  G4double fire();

  inline G4double fire( G4double mean, G4double stdDev );
  
  void fireArray ( const G4int size, G4double* vect);
  void fireArray ( const G4int size, G4double* vect,
                   G4double mean, G4double stdDev );

  virtual G4double operator()();
  virtual G4double operator()( G4double mean, G4double stdDev );

  //  values.

  static  G4bool getFlag() {return set_st;}

  static  void setFlag( G4bool val ) {set_st = val;}

  G4bool getF() const {return set;}
  
  void setF( G4bool val ) {set = val;}

  // Methods overriding the base class static saveEngineStatus ones,
  // by adding extra data so that save in one program, then further gaussians,
  // will produce the identical sequence to restore in another program, then 
  // generating gaussian randoms there 

  static  G4double getVal() {return nextGauss_st;}

  static  void setVal( G4double nextVal ) {nextGauss_st = nextVal;}

  G4double normal();

  G4double defaultMean;
  G4double defaultStdDev;

  CLHEP::HepRandomEngine* localEngine;

private:

  G4bool deleteEngine, set;
  G4double nextGauss;

  // static data
  static G4ThreadLocal G4bool set_st;
  static G4ThreadLocal G4double nextGauss_st;

};

#include "G4MTRandGauss.icc"

#endif