CLHEP/Random/RandExponential.h
// $Id: RandExponential.h,v 1.8 2000/04/17 23:00:00 mf Exp $
// -*- C++ -*-
//
// -----------------------------------------------------------------------
// HEP Random
// --- RandExponential ---
// class header file
// -----------------------------------------------------------------------
// This file is part of Geant4 (simulation toolkit for HEP).
//
// Class defining methods for shooting exponential distributed random
// values, given a mean (default mean = 1).
// Default mean is used for operator()().
// =======================================================================
// Gabriele Cosmo - Created: 5th September 1995
// - Added methods to shoot arrays: 28th July 1997
// J.Marraffino - Added default mean as attribute and
// operator() with mean: 16th Feb 1998
// =======================================================================
#ifndef RandExponential_h
#define RandExponential_h 1
#include "CLHEP/Random/Random.h"
class RandExponential : public HepRandom {
public:
inline RandExponential ( HepRandomEngine& anEngine, HepDouble mean=1.0 );
inline RandExponential ( HepRandomEngine* anEngine, HepDouble mean=1.0 );
// These constructors should be used to instantiate a RandExponential
// 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 RandExponential destructor.
// If the engine is passed by reference the corresponding engine object
// will not be deleted by the RandExponential destructor.
virtual ~RandExponential();
// Destructor
// Static methods to shoot random values using the static generator
static HepDouble shoot();
static HepDouble shoot( HepDouble mean );
static void shootArray ( const HepInt size, HepDouble* vect,
HepDouble mean=1.0 );
// Static methods to shoot random values using a given engine
// by-passing the static generator.
static inline HepDouble shoot( HepRandomEngine* anEngine );
static inline HepDouble shoot( HepRandomEngine* anEngine, HepDouble mean );
static void shootArray ( HepRandomEngine* anEngine, const HepInt size,
HepDouble* vect, HepDouble mean=1.0 );
// Methods using the localEngine to shoot random values, by-passing
// the static generator.
inline HepDouble fire();
inline HepDouble fire( HepDouble mean );
void fireArray ( const HepInt size, HepDouble* vect );
void fireArray ( const HepInt size, HepDouble* vect, HepDouble mean );
HepDouble operator()();
HepDouble operator()( HepDouble mean );
private:
// Private copy constructor. Defining it here disallows use.
RandExponential(const RandExponential& d);
HepRandomEngine* localEngine;
HepBoolean deleteEngine;
const HepDouble defaultMean;
};
#include "CLHEP/Random/RandExponential.icc"
#endif
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