RandGaussQ.h

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// -*- C++ -*-
//
// -----------------------------------------------------------------------
//                             HEP Random
//                          --- RandGaussQ ---
//                          class header file
// -----------------------------------------------------------------------
 
// Class defining methods RandGaussQ, which is derived from RandGauss.
// The user interface is identical; but RandGaussQ is faster and a bit less
// accurate.
 
// =======================================================================
// M. Fischler - Created: 24th Jan 2000
// M Fischler      - put and get to/from streams 12/10/04
//
// =======================================================================
 
#ifndef RandGaussQ_h
#define RandGaussQ_h 1
 
#include "CLHEP/Random/RandGauss.h"
 
namespace CLHEP {
 
/**
 * @author
 * @ingroup random
 */
class RandGaussQ : public RandGauss {
 
public:
 
  inline RandGaussQ ( HepRandomEngine& anEngine, double mean=0.0,
                                                double stdDev=1.0 );
  inline RandGaussQ ( HepRandomEngine* anEngine, double mean=0.0,
                                                double stdDev=1.0 );
  // These constructors should be used to instantiate a RandGaussQ
  // 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 RandGaussQ destructor.
  // If the engine is passed by reference the corresponding engine object
  // will not be deleted by the RandGaussQ destructor.
 
  // Destructor
  virtual ~RandGaussQ();
 
  //
  // Methods to generate Gaussian-distributed random deviates:
  //
  //   If a fast good engine takes 1 usec, RandGauss::fire() adds 1 usec while 
  //   RandGaussQ::fire() adds only .4 usec.
  //
 
  // Static methods to shoot random values using the static generator
 
  static  inline double shoot();
 
  static  inline double shoot( double mean, double stdDev );
 
  static  void shootArray ( const int size, double* vect,
                            double mean=0.0, double stdDev=1.0 );
 
  //  Static methods to shoot random values using a given engine
  //  by-passing the static generator.
 
  static  inline double shoot( HepRandomEngine* anotherEngine );
 
  static  inline double shoot( HepRandomEngine* anotherEngine, 
                                  double mean, double stdDev );
 
 
  static  void shootArray ( HepRandomEngine* anotherEngine, 
                const int size,
                            double* vect, double mean=0.0,
                            double stdDev=1.0 );
 
  //  Instance methods using the localEngine to instead of the static 
  //  generator, and the default mean and stdDev established at construction
 
  inline double fire();
 
  inline double fire ( double mean, double stdDev );
  
  void fireArray  ( const int size, double* vect);
  void fireArray  ( const int size, double* vect,
                    double mean, double stdDev );
 
  virtual double operator()();
  virtual double operator()( double mean, double stdDev );
 
  // Save and restore to/from streams
  
  std::ostream & put ( std::ostream & os ) const;
  std::istream & get ( std::istream & is );
 
  std::string name() const;
  HepRandomEngine & engine();
 
  static std::string distributionName() {return "RandGaussQ";}  
  // Provides the name of this distribution class
  
 
protected:
 
  static double transformQuick (double r);
  static double transformSmall (double r);
 
private:
 
  // All the engine info, and the default mean and sigma, are in the RandGauss
  // base class.
 
};
 
}  // namespace CLHEP
 
#include "CLHEP/Random/RandGaussQ.icc"
 
#endif