CLHEP/Random/RandEngine.h
// $Id: RandEngine.h,v 1.9 2000/04/17 22:59:57 mf Exp $
// -*- C++ -*-
//
// -----------------------------------------------------------------------
// HEP Random
// --- RandEngine ---
// class header file
// -----------------------------------------------------------------------
// This file is part of Geant4 (simulation toolkit for HEP).
//
// Simple random engine using rand() and srand() functions from C standard
// library to implement the flat() basic distribution and for setting
// seeds.
// Copy constructor and operator= are private for objects of this class.
// =======================================================================
// Gabriele Cosmo - Created: 5th September 1995
// - Minor corrections: 31st October 1996
// - Added methods for engine status: 19th November 1996
// - setSeed(), setSeeds() now have default dummy argument
// set to zero: 11th July 1997
// - Private copy constructor and operator=: 26th Feb 1998
// J.Marraffino - Added stream operators and related constructor.
// Added automatic seed selection from seed table and
// engine counter: 15th Feb 1998
// Ken Smith - Added conversion operators: 6th Aug 1998
// replace mx by mantissa_bit_32
// =======================================================================
#ifndef RandEngine_h
#define RandEngine_h 1
#include "CLHEP/Random/RandomEngine.h"
class RandEngine : public HepRandomEngine {
public:
RandEngine(HepStd::istream& is);
RandEngine();
RandEngine(long seed);
RandEngine(HepInt rowIndex, HepInt colIndex);
virtual ~RandEngine();
// Constructors and destructor
HepDouble flat();
// It returns a pseudo random number between 0 and 1,
// according to the standard stdlib random function rand()
// but excluding the end points.
void flatArray (const HepInt size, HepDouble* vect);
// Fills the array "vect" of specified size with flat random values.
void setSeed(long seed, HepInt dum=0);
// Sets the state of the algorithm according to seed.
void setSeeds(const long * seeds, HepInt dum=0);
// Sets the state of the algorithm according to the zero terminated
// array of seeds. Only the first seed is used.
void saveStatus( const char filename[] = "Rand.conf" ) const;
// Saves on file Rand.conf the current engine status.
void restoreStatus( const char filename[] = "Rand.conf" );
// Reads from file Rand.conf the last saved engine status
// and restores it.
void showStatus() const;
// Dumps the engine status on the screen.
operator unsigned int(); // 32-bit flat value, quickest of all.
friend HepStd::ostream& operator<< (HepStd::ostream& os, const RandEngine& e);
friend HepStd::istream& operator>> (HepStd::istream& is, RandEngine& e);
private:
RandEngine(const RandEngine &p);
RandEngine & operator = (const RandEngine &p);
// Private copy constructor and assignment operator.
private:
const HepDouble mantissa_bit_32;
long seq;
static HepInt numEngines;
static HepInt maxIndex;
};
#endif
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