RWRandGenerator Class Reference
[Statistics]

Generates random numbers uniformly distributed over the interval [0, 1]. More...

#include <rw/randgen.h>

List of all members.

Public Member Functions
	RWRandGenerator ()
	RWRandGenerator (long seed)
	RWRandGenerator (const RWRandGenerator &x)
double	operator() ()
void	restart ()
void	restart (long seed)
void	reference (const RWRandGenerator &x)
void	deepenShallowCopy ()
void	operator= (const RWRandGenerator &x)
void	printOn (std::ostream &s) const
void	scanFrom (std::istream &s)
void	restoreFrom (RWFile &)
void	restoreFrom (RWvistream &)
void	saveOn (RWFile &) const
void	saveOn (RWvostream &) const
Related Functions
(Note that these are not member functions.)
std::ostream &	operator<< (std::ostream &s, const RWRandGenerator &rgen)
std::istream &	operator>> (std::istream &s, RWRandGenerator &rgen)

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Detailed Description

Class RWRandGenerator generates random numbers uniformly distributed over the interval [0, 1]. RWRandGenerator objects can be independent or share state with each other. The Essential Math Module contains a global default state that is shared by all generators created with the default constructor. Using the default generator state does not guarantee repeatable sequences, even if you restart() it using a specific seed. This is because the global state may be shared among several applications in a multithreaded environment. There is no protection against multiple threads of control using the global default state at the same time. To achieve repeatable sequences, you must construct a generator with a specific seed value and use the generator for random number generation.

Synopsis

 #include <rw/randgen.h>
 RWRandGenerator gen;

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Constructor & Destructor Documentation

RWRandGenerator::RWRandGenerator

(

)

Constructs a generator with the shared global default state.

RWRandGenerator::RWRandGenerator

(

long

seed

)

Constructs a generator with specified initial seed. The generator has its own state.

RWRandGenerator::RWRandGenerator

(

const RWRandGenerator &

x

)

Constructs a copy of x. The generators share state.

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Member Function Documentation

void RWRandGenerator::deepenShallowCopy

(

)

Makes the state independent, but doesn't change it.

double RWRandGenerator::operator()

(

)

Returns a random double in [0, 1].

void RWRandGenerator::operator=

(

const RWRandGenerator &

x

)

Sets state to argument's state.

void RWRandGenerator::printOn

(

std::ostream &

s

)

const

Outputs a summary of self's internal state on ostream s.

void RWRandGenerator::reference

(

const RWRandGenerator &

x

)

Sets state to argument's state.

void RWRandGenerator::restart

(

long

seed

)

Restarts the generator with the specified seed.

void RWRandGenerator::restart

(

)

Restarts the generator with a random seed.

void RWRandGenerator::restoreFrom

(

RWvistream &

)

Restores internal state of self from a virtual stream.

void RWRandGenerator::restoreFrom

(

RWFile &

)

Restores internal state of self from an RWFile.

void RWRandGenerator::saveOn

(

RWvostream &

)

const

Stores internal state of self to a virtual stream.

void RWRandGenerator::saveOn

(

RWFile &

)

const

Stores internal state of self in a binary format to an RWFile.

void RWRandGenerator::scanFrom

(

std::istream &

s

)

Inputs an internal state from istream s to self.

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Friends And Related Function Documentation

std::ostream & operator<<	(	std::ostream &	s,
		const RWRandGenerator &	rgen
	)			[related]

Outputs a summary of the internal state of rgen on ostream s.

std::istream & operator>>	(	std::istream &	s,
		RWRandGenerator &	rgen
	)			[related]

Inputs an internal state from istream s to rgen.