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1 // -*- C++ -*- 1 2 // 3 // ------------------------------------------- 4 // HEP Random 5 // --- RandGamma --- 6 // class header file 7 // ------------------------------------------- 8 9 // Class defining methods for shooting gamma d 10 // given a k (default=1) and specifying also a 11 // Default values are used for operator()(). 12 13 // Valid input values are k > 0 and lambda > 0 14 // presented, the code silently returns -1.0. 15 16 // =========================================== 17 // John Marraffino - Created: 12th May 1998 B 18 // by Ernst Stadlober and Fr 19 // University of Graz, Austr 20 // Gabriele Cosmo - Removed useless methods a 21 // M Fischler - put and get to/from strea 22 // =========================================== 23 24 #ifndef RandGamma_h 25 #define RandGamma_h 1 26 27 #include "CLHEP/Random/Random.h" 28 #include "CLHEP/Utility/memory.h" 29 30 namespace CLHEP { 31 32 /** 33 * @author 34 * @ingroup random 35 */ 36 class RandGamma : public HepRandom { 37 38 public: 39 40 inline RandGamma ( HepRandomEngine& anEngine 41 42 inline RandGamma ( HepRandomEngine* anEngine 43 44 // These constructors should be used to inst 45 // distribution object defining a local engi 46 // The static generator will be skipped usin 47 // defined below. 48 // If the engine is passed by pointer the co 49 // will be deleted by the RandGamma destruct 50 // If the engine is passed by reference the 51 // will not be deleted by the RandGamma dest 52 53 virtual ~RandGamma(); 54 // Destructor 55 56 // Static methods to shoot random values usi 57 58 static inline double shoot(); 59 60 static double shoot( double k, double lambda 61 62 static void shootArray ( const int size, dou 63 double k=1.0, doub 64 65 // Static methods to shoot random values us 66 // by-passing the static generator. 67 68 static inline double shoot( HepRandomEngine* 69 70 static double shoot( HepRandomEngine* anEngi 71 double k, do 72 73 static void shootArray ( HepRandomEngine* an 74 double* vect, doub 75 double lambda=1.0 76 77 // Methods using the localEngine to shoot r 78 // the static generator. 79 80 inline double fire(); 81 82 double fire( double k, double lambda ); 83 84 void fireArray ( const int size, double* vec 85 void fireArray ( const int size, double* vec 86 double k, double lambda ); 87 inline double operator()(); 88 inline double operator()( double k, double l 89 90 // Save and restore to/from streams 91 92 std::ostream & put ( std::ostream & os ) con 93 std::istream & get ( std::istream & is ); 94 95 std::string name() const; 96 HepRandomEngine & engine(); 97 98 static std::string distributionName() {retur 99 // Provides the name of this distribution cl 100 101 102 private: 103 104 static double genGamma( HepRandomEngine *anE 105 106 107 std::shared_ptr<HepRandomEngine> localEngine 108 double defaultK; 109 double defaultLambda; 110 111 }; 112 113 } // namespace CLHEP 114 115 #include "CLHEP/Random/RandGamma.icc" 116 117 #endif 118