libfbm::Seeder Class Reference

Seed generator for random number generators. More...

#include <libfbm.hpp>

List of all members.

Public Member Functions
	Seeder (const char *path)
	Construct the Seeder.
	~Seeder ()
void	seed (uint32_t index)
size_t	size () const
	operator const unsigned char * () const

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Detailed Description

Seed generator for random number generators.

The Mersenne twister has a known weakness, that is with a small integer seed the first generated values are not very random. That is it takes a while for the generator to "work in". To get over this one can use a larger seed. This class generates such seeds from an integer index and a datafile containing random bits. On Unix one can easily generate such a seed pool file by executing:

dd if=/dev/urandom of=seedpool.dat bs=1024 count=1024

The seeds generated are 256 bytes long and contain blocks from the seed pool xor-ed with the given index. I'm not a specialist in random number generation, so I hope this is adequate.

Definition at line 388 of file libfbm.hpp.

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Constructor & Destructor Documentation

libfbm::Seeder::Seeder

(

const char *

path

)

Construct the Seeder.

The program aborts if the path cannot be opened or seed pool is too small (4kB).

libfbm::Seeder::~Seeder

(

)

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Member Function Documentation

libfbm::Seeder::operator const unsigned char * ( ) const

inline

Definition at line 399 of file libfbm.hpp.

void libfbm::Seeder::seed

(

uint32_t

index

)

size_t libfbm::Seeder::size ( ) const

inline

Definition at line 398 of file libfbm.hpp.

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

• libfbm.hpp