/usr/include/CLHEP/Random/RandExponential.h is in libclhep-dev 2.1.4.1+dfsg-1.
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// -*- 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
// M Fischler - put and get to/from streams 12/10/04
// =======================================================================
#ifndef RandExponential_h
#define RandExponential_h 1
#include "CLHEP/Random/defs.h"
#include "CLHEP/Random/Random.h"
#include "CLHEP/Utility/memory.h"
namespace CLHEP {
/**
* @author <Gabriele.Cosmo@cern.ch>
* @ingroup random
*/
class RandExponential : public HepRandom {
public:
inline RandExponential ( HepRandomEngine& anEngine, double mean=1.0 );
inline RandExponential ( HepRandomEngine* anEngine, double 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 double shoot();
static double shoot( double mean );
static void shootArray ( const int size, double* vect,
double mean=1.0 );
// Static methods to shoot random values using a given engine
// by-passing the static generator.
static inline double shoot( HepRandomEngine* anEngine );
static inline double shoot( HepRandomEngine* anEngine, double mean );
static void shootArray ( HepRandomEngine* anEngine, const int size,
double* vect, double mean=1.0 );
// Methods using the localEngine to shoot random values, by-passing
// the static generator.
inline double fire();
inline double fire( double mean );
void fireArray ( const int size, double* vect );
void fireArray ( const int size, double* vect, double mean );
double operator()();
double operator()( double mean );
// 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 "RandExponential";}
// Provides the name of this distribution class
private:
shared_ptr<HepRandomEngine> localEngine;
double defaultMean;
};
} // namespace CLHEP
#ifdef ENABLE_BACKWARDS_COMPATIBILITY
// backwards compatibility will be enabled ONLY in CLHEP 1.9
using namespace CLHEP;
#endif
#include "CLHEP/Random/RandExponential.icc"
#endif
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