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File indexing completed on 2025-01-18 09:54:37
0001 // $Id: Hurd160Engine.h,v 1.5 2010/06/16 17:24:53 garren Exp $ 0002 // -*- C++ -*- 0003 // 0004 // ----------------------------------------------------------------------- 0005 // HEP Random 0006 // --- Hurd160Engine --- 0007 // class header file 0008 // ----------------------------------------------------------------------- 0009 // 0010 // The starting point for the Hurd Random algorithm is the paper in 0011 // IEEE Transactions on Computers c23, 2 Feb 1974. The algorithm is 0012 // essentially a series of 32 interconnected b-bit registers. The basic 0013 // property is that at each step, bit 1 becomes bit 0, bit 2 the new bit 1, 0014 // bit b the new bit b-1. This is modified so that the new bit b0 is the old 0015 // bit b1 XOR'd with some bit b-d from the previous bit register. The values 0016 // of d can be chosen so as to generate a primitive polynomial, a maximal 0017 // length sequence through all bit patterns except the zero pattern. 0018 // 0019 // This generator, Hurd160 use values based upon Table I of the afore 0020 // mentioned paper, such that we have 160 total bits, representing 32 0021 // 5-bit registers (actually implemented as an array of 5 32-bit words) 0022 // ======================================================================= 0023 // 07-23-98 KLS Initial draft started 0024 // Ken Smith - Added conversion operators: 6th Aug 1998 0025 // Mark Fischler - Methods put, get for instance save/restore 12/8/04 0026 // Mark Fischler - methods for anonymous save/restore 12/27/04 0027 // ======================================================================= 0028 0029 #ifndef Hurd160Engine_h 0030 #define Hurd160Engine_h 0031 0032 #include "CLHEP/Random/defs.h" 0033 #include "CLHEP/Random/RandomEngine.h" 0034 0035 namespace CLHEP { 0036 0037 /** 0038 * @author 0039 * @ingroup random 0040 */ 0041 class Hurd160Engine: public HepRandomEngine { 0042 0043 public: 0044 0045 Hurd160Engine(); 0046 Hurd160Engine( std::istream &is); 0047 Hurd160Engine( long seed ); 0048 Hurd160Engine( int rowIndex, int colIndex ); 0049 virtual ~Hurd160Engine(); 0050 // Constructors and destructor. 0051 0052 double flat(); 0053 // Returns a pseudo random number between 0 and 1 0054 0055 void flatArray( const int size, double* vect ); 0056 // Fills the array "vect" of specified size with flat random values. 0057 0058 void setSeed( long seed, int ); 0059 // Sets the state of the algorithm according to seed. 0060 0061 void setSeeds( const long* seeds, int ); 0062 // Sets the state of the algorithm according to the zero-terminated 0063 // array of seeds. 0064 0065 void saveStatus( const char filename[] = "Hurd160Engine.conf" ) const; 0066 // Saves on named file the current engine status 0067 0068 void restoreStatus( const char filename[] = "Hurd160Engine.conf" ); 0069 // Reads from named file the last saved engine status 0070 // and restores it. 0071 0072 void showStatus() const; 0073 // Dumps the engine status on the screen 0074 0075 operator double(); // Returns same as flat() 0076 operator float(); // flat value, without worrying about filling bits 0077 operator unsigned int(); // 32-bit flat value, quickest of all 0078 0079 virtual std::ostream & put (std::ostream & os) const; 0080 virtual std::istream & get (std::istream & is); 0081 0082 std::string name() const; 0083 static std::string engineName() {return "Hurd160Engine";} 0084 static std::string beginTag ( ); 0085 virtual std::istream & getState ( std::istream & is ); 0086 0087 std::vector<unsigned long> put () const; 0088 bool get (const std::vector<unsigned long> & v); 0089 bool getState (const std::vector<unsigned long> & v); 0090 0091 static const unsigned int VECTOR_STATE_SIZE = 7; 0092 0093 private: 0094 0095 void advance(); 0096 0097 long seeds_[2]; 0098 int wordIndex; 0099 unsigned int words[5]; 0100 0101 }; // Hurd160Engine 0102 0103 } // namespace CLHEP 0104 0105 #ifdef ENABLE_BACKWARDS_COMPATIBILITY 0106 // backwards compatibility will be enabled ONLY in CLHEP 1.9 0107 using namespace CLHEP; 0108 #endif 0109 0110 #endif // Hurd160Engine_h
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