/usr/include/CLHEP/Random/RandLandau.h is in libclhep-dev 2.1.4.1+dfsg-1.
This file is owned by root:root, with mode 0o644.
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// -*- C++ -*-
//
// -----------------------------------------------------------------------
// HEP Random
// --- RandLandau ---
// class header file
// -----------------------------------------------------------------------
// This file is part of Geant4 (simulation toolkit for HEP).
// Class defining methods for shooting or firing Landau distributed
// random values.
//
// The Landau distribution is parameterless and describes the fluctuations
// in energy loss of a particle, making certain assumptions. For
// definitions and algorithms, the following papers could be read:
//
// Landau, Jour Phys VIII, No. 4, p. 201 (1944)
// Borsh-Supan, Jour Res. of NBS 65B NO. 4 p. 245 (1961)
// Kolbig & Schorr Comp Phys Comm 31 p. 97 (1984)
//
// The algorithm implemented comes form RANLAN in CERNLIB.
// =======================================================================
// M. Fischler - Created: 5th January 2000
// M Fischler - put and get to/from streams 12/10/04
//
// =======================================================================
#ifndef RandLandau_h
#define RandLandau_h 1
#include "CLHEP/Random/defs.h"
#include "CLHEP/Random/Random.h"
#include "CLHEP/Utility/memory.h"
namespace CLHEP {
/**
* @author
* @ingroup random
*/
class RandLandau : public HepRandom {
public:
inline RandLandau ( HepRandomEngine& anEngine );
inline RandLandau ( HepRandomEngine* anEngine );
// These constructors should be used to instantiate a RandLandau
// 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 RandLandau destructor.
// If the engine is passed by reference the corresponding engine object
// will not be deleted by the RandLandau destructor.
virtual ~RandLandau();
// Destructor
// Save and restore to/from streams
std::ostream & put ( std::ostream & os ) const;
std::istream & get ( std::istream & is );
//
// Methods to generate Landau-distributed random deviates.
//
// These deviates are accurate to the actual Landau distribution to
// one part in 10**5 or better.
// Static methods to shoot random values using the static generator
static inline double shoot();
static void shootArray ( const int size, double* vect );
// Static methods to shoot random values using a given engine
// by-passing the static generator.
static inline double shoot( HepRandomEngine* anotherEngine );
static void shootArray ( HepRandomEngine* anotherEngine,
const int size,
double* vect );
// Instance methods using the localEngine to instead of the static
// generator, and the default mean and stdDev established at construction
inline double fire();
void fireArray ( const int size, double* vect);
inline double operator()();
std::string name() const;
HepRandomEngine & engine();
static std::string distributionName() {return "RandLandau";}
// Provides the name of this distribution class
protected:
static double transform (double r);
static double transformSmall (double r);
private:
shared_ptr<HepRandomEngine> localEngine;
};
} // namespace CLHEP
#ifdef ENABLE_BACKWARDS_COMPATIBILITY
// backwards compatibility will be enabled ONLY in CLHEP 1.9
using namespace CLHEP;
#endif
#include "CLHEP/Random/RandLandau.icc"
#endif
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