rnr::Random Class Reference

Random variable generators class. More...

#include <Random.h>

Public Member Functions
	Random (ulong_t luSeed=AUTO_SEED)
	Default initialization constructor. More...
virtual	~Random ()
	Destructor.
int	randint ()
	Generates a random integer uniformally distrubuted between [-2^31, 2^32-1]. More...
int	randrange (int nMin=0, int nMax=INT_MAX)
	Generates a random integer uniformally distrubuted between [nMin, nMax]. More...
s64_t	randrange (s64_t nMin=0, s64_t nMax=LLONG_MAX)
	Generates a random 64-bit integer uniformally distrubuted between [nMin, nMax]. More...
float	uniform (float fMin=0.0, float fMax=1.0)
	Generates a random float uniformally distrubuted between [fMin, fMax]. More...

Static Public Attributes
static const ulong_t	AUTO_SEED = 0

Protected Attributes
struct drand48_data	m_randState
	random generator opaque state.

Detailed Description

Random variable generators class.

Definition at line 79 of file Random.h.

Constructor & Destructor Documentation

Random::Random

(

ulong_t

luSeed = AUTO_SEED

)

Default initialization constructor.

Parameters

luSeed

Random generator seed.

Definition at line 72 of file Random.cxx.

References m_randState.

{
  ushort_t  seed[3];  // 48-bits

  if( luSeed == AUTO_SEED )
  {
    luSeed = (ulong_t)time(NULL);
  }

  seed[0] = (ushort_t)(luSeed & 0xffff);
  seed[1] = (ushort_t)((luSeed >> 16) & 0xffff);
  seed[2] = (ushort_t)(seed[0] << 8) | (ushort_t)(seed[1] >> 8);

  seed48_r(seed, &m_randState);
}

Member Function Documentation

int rnr::Random::randint ( )

inline

Generates a random integer uniformally distrubuted between [-2^31, 2^32-1].

Returns

Random value.

Definition at line 102 of file Random.h.

References m_randState, randrange(), and uniform().

    {
      long lRandVal;

      mrand48_r(&m_randState, &lRandVal);

      return (int)lRandVal;
    }

int Random::randrange	(	int	nMin = 0,
		int	nMax = INT_MAX
	)

Generates a random integer uniformally distrubuted between [nMin, nMax].

Parameters

nMin	Minimum value.
nMax	Maximum value.

Returns

Random value.

Definition at line 88 of file Random.cxx.

References m_randState.

Referenced by randint(), and rnr::State::receiveEvent().

{
  double  lfRandVal;

  drand48_r(&m_randState, &lfRandVal);

  return (int)((double)(nMax - nMin) * lfRandVal + nMin);
}

s64_t Random::randrange	(	s64_t	nMin = 0,
		s64_t	nMax = LLONG_MAX
	)

Generates a random 64-bit integer uniformally distrubuted between [nMin, nMax].

Parameters

nMin	Minimum value.
nMax	Maximum value.

Returns

Random value.

Definition at line 97 of file Random.cxx.

References m_randState.

{
  double  lfRandVal;

  drand48_r(&m_randState, &lfRandVal);

  return (s64_t)((double)(nMax - nMin) * lfRandVal + nMin);
}

float Random::uniform	(	float	fMin = 0.0,
		float	fMax = 1.0
	)

Generates a random float uniformally distrubuted between [fMin, fMax].

Parameters

fMin	Minimum value.
fMax	Maximum value.

Returns

Random value.

Definition at line 106 of file Random.cxx.

References m_randState.

Referenced by UTThread::exec(), and randint().

{
  double  lfRandVal;

  drand48_r(&m_randState, &lfRandVal);

  return (float)((double)(fMax - fMin) * lfRandVal + fMin);
}

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

• include/rnr/appkit/Random.h
• sw/librnr_appkit/Random.cxx