Random.Xorshift.Int64

This module contains a 64 bit Xorshift random generator. Use this if you need a 64 bit random generator, usually Xorshift itself is a good choice for your platform. This generator has a period of 2^64-1 bits if initialized with a value different from 0.

Documentation

newtype Xorshift64

Xorshift generator with 64 bits. This Xorshift generator uses first a left shift, then a right shift and again a left shift. It uses the parameters 13, 7 and 17. See the paper for more details on how the parameters affect the generation of random numbers.

The generator has a periode of 2^64-1, please notice that the generator has to be initialized with a value different from 0, elseway all future values will be zero as well.

Please notice, that the function split is not implemented and will result in a runtime error.

Constructors

Xorshift64 Int64

Instances

Bounded Xorshift64

Enum Xorshift64

Eq Xorshift64

Show Xorshift64

RandomGen Xorshift64

newXorshift64 :: IO Xorshift64

Generates a new Xorshift64 from the current time.

makeXorshift64 :: Integral a => a -> Xorshift64

Generate a new Xorshift64 generator. This is essentially a wrapper around the constructor.

getInt64 :: Xorshift64 -> Int64

Get the raw contents of the random generator. This function is preferable over direct usage of the constructor itself, as the internal representation of the random generator may change in future releases.