tools::rtausmeui Class Reference

Inheritance diagram for tools::rtausmeui:

Public Member Functions
	rtausmeui (unsigned int a_seed=1)
virtual	~rtausmeui ()
	rtausmeui (const rtausmeui &a_from)
rtausmeui &	operator= (const rtausmeui &a_from)
void	set_seed (unsigned int a_seed)
unsigned int	seed () const
unsigned int	shoot ()

Static Protected Member Functions
static unsigned int	LCG (unsigned int a_n)
static unsigned int	TAUSWORTHE (unsigned int a_s, unsigned int a_a, unsigned int a_b, unsigned int a_c, unsigned int a_d)

Protected Attributes
unsigned int	m_seed
unsigned int	m_seed1
unsigned int	m_seed2

Detailed Description

Definition at line 36 of file rtausmeui.

Constructor & Destructor Documentation

rtausmeui() [1/2]

tools::rtausmeui::rtausmeui ( unsigned int  a_seed = 1 )

inline

Definition at line 41 of file rtausmeui.

                                    :m_seed(0),m_seed1(0),m_seed2(0){
#ifdef TOOLS_MEM
    mem::increment(s_class().c_str());
#endif
    set_seed(a_seed);
  }

~rtausmeui()

virtual tools::rtausmeui::~rtausmeui ( )

inlinevirtual

Definition at line 47 of file rtausmeui.

                      {
#ifdef TOOLS_MEM
    mem::decrement(s_class().c_str());
#endif
  }

rtausmeui() [2/2]

tools::rtausmeui::rtausmeui ( const rtausmeui &  a_from )

inline

Definition at line 53 of file rtausmeui.

                                    :m_seed(a_from.m_seed),m_seed1(a_from.m_seed1),m_seed2(a_from.m_seed2){
#ifdef TOOLS_MEM
    mem::increment(s_class().c_str());
#endif
  }

Member Function Documentation

LCG()

static unsigned int tools::rtausmeui::LCG ( unsigned int  a_n )

inlinestaticprotected

Definition at line 103 of file rtausmeui.

                                            {
    return ((69069 * a_n) & 0xffffffffUL);  // linear congurential generator
  }

operator=()

rtausmeui& tools::rtausmeui::operator= ( const rtausmeui &  a_from )

inline

Definition at line 58 of file rtausmeui.

                                                {
    m_seed = a_from.m_seed;
    m_seed1 = a_from.m_seed1;
    m_seed2 = a_from.m_seed2;
    return *this;
  }

seed()

unsigned int tools::rtausmeui::seed ( ) const

inline

Definition at line 83 of file rtausmeui.

{return m_seed;}

set_seed()

void tools::rtausmeui::set_seed ( unsigned int  a_seed )

inline

Definition at line 65 of file rtausmeui.

                                     {
    m_seed = a_seed?a_seed:1;
 
    // Generate m_seed[1,2] needed for the generator state using
    // a linear congruential generator
    // The only condition, stated at the end of the 1999 L'Ecuyer paper is that the seeds
    // must be greater than 1,7 and 15.
 
    m_seed = LCG(m_seed);
    if (m_seed < 2) m_seed += 2UL;
    m_seed1 = LCG(m_seed);
    if (m_seed1 < 8) m_seed1 += 8UL;
    m_seed2 = LCG(m_seed1);
    if (m_seed2 < 16) m_seed2 += 16UL;
 
    // "warm it up" by calling it 6 times
    for (unsigned int i = 0; i < 6; ++i) shoot();
  }

shoot()

unsigned int tools::rtausmeui::shoot ( )

inline

Definition at line 85 of file rtausmeui.

                       {
    //  TausWorth generator from L'Ecuyer, uses as seed 3x32bits integers
    //  Use a mask of 0xffffffffUL to make in work on 64 bit machines
    //  Periodicity of about  10**26
 
    unsigned int y;
 
    do {
      m_seed  = TAUSWORTHE (m_seed, 13, 19, 4294967294UL, 12);
      m_seed1 = TAUSWORTHE (m_seed1, 2, 25, 4294967288UL, 4);
      m_seed2 = TAUSWORTHE (m_seed2, 3, 11, 4294967280UL, 17);
 
      y = m_seed ^ m_seed1 ^ m_seed2;
    } while(!y);
 
    return y;
  }

TAUSWORTHE()

static unsigned int tools::rtausmeui::TAUSWORTHE ( unsigned int  a_s, unsigned int  a_a, unsigned int  a_b, unsigned int  a_c, unsigned int  a_d  )

inlinestaticprotected

Definition at line 106 of file rtausmeui.

                                                                                                                       {
    return (((a_s & a_c) << a_d) & 0xffffffffUL ) ^ ((((a_s << a_a) & 0xffffffffUL )^ a_s) >> a_b);
  }

Member Data Documentation

m_seed

unsigned int tools::rtausmeui::m_seed

protected

Definition at line 110 of file rtausmeui.

m_seed1

unsigned int tools::rtausmeui::m_seed1

protected

Definition at line 111 of file rtausmeui.

m_seed2

unsigned int tools::rtausmeui::m_seed2

protected

Definition at line 112 of file rtausmeui.

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The documentation for this class was generated from the following file:

• /Users/barrand/private/dev/softinex/g4tools/g4tools/tools/rtausmeui