File Information
Library: Foundation
Package: Crypt
Header: Poco/Random.h
Description
A better random number generator. Random implements a pseudo random number generator (PRNG). The PRNG is a nonlinear additive feedback random number generator using 256 bytes of state information and a period of up to 2^69.
Member Summary
Member Functions: goodRand, initState, next, nextBool, nextChar, nextDouble, nextFloat, seed
Enumerations
Type
RND_STATE_0 = 8
linear congruential
RND_STATE_32 = 32
x**7 + x**3 + 1
RND_STATE_64 = 64
x**15 + x + 1
RND_STATE_128 = 128
x**31 + x**3 + 1
RND_STATE_256 = 256
x**63 + x + 1
Constructors
Random
Random(
int stateSize = 256
);
Creates and initializes the PRNG. Specify either a state buffer size (8 to 256 bytes) or one of the Type values.
Destructor
~Random
~Random();
Destroys the PRNG.
Member Functions
next 
UInt32 next();
Returns the next 31-bit pseudo random number.
next
Returns the next 31-bit pseudo random number modulo n.
nextBool
bool nextBool();
Returns the next boolean pseudo random value.
nextChar
char nextChar();
Returns the next pseudo random character.
nextDouble
double nextDouble();
Returns the next double pseudo random number between 0.0 and 1.0.
nextFloat
float nextFloat();
Returns the next float pseudo random number between 0.0 and 1.0.
seed
void seed(
UInt32 seed
);
Seeds the pseudo random generator with the given seed.
seed
void seed();
Seeds the pseudo random generator with a random seed obtained from a RandomInputStream.
goodRand 
static UInt32 goodRand(
Int32 x
);
initState
void initState(
UInt32 seed,
char * arg_state,
Int32 n
);