helib::RandomState Class Reference

Facility for "restoring" the NTL PRG state. More...

#include <NumbTh.h>

Public Member Functions
	RandomState ()
void	restore ()
	Restore the PRG state of NTL. More...
	~RandomState ()

Detailed Description

Facility for "restoring" the NTL PRG state.

NTL's random number generation facility is pretty limited, and does not provide a way to save/restore the state of a pseudo-random stream. This class gives us that ability: Constructing a RandomState object uses the PRG to generate 512 bits and stores them. Upon destruction (or an explicit call to restore()), these bits are used to re-set the seed of the PRG. A typical usage of the class is as follows:

{
  RandomState r;      // save the random state
 
  SetSeed(something); // set the PRG seed to something
  ...                 // more code that uses the new PRG seed
 
} // The destructor is called implicitly, PRG state is restored

Constructor & Destructor Documentation

RandomState()

helib::RandomState::RandomState ( )

inline

~RandomState()

helib::RandomState::~RandomState ( )

inline

Member Function Documentation

restore()

void helib::RandomState::restore ( )

inline

Restore the PRG state of NTL.