Package org.apache.commons.rng.core.source64

Class XoShiRo256Plus

java.lang.Object

org.apache.commons.rng.core.BaseProvider

org.apache.commons.rng.core.source64.LongProvider

org.apache.commons.rng.core.source64.AbstractXoShiRo256

org.apache.commons.rng.core.source64.XoShiRo256Plus

All Implemented Interfaces:

RandomLongSource, JumpableUniformRandomProvider, LongJumpableUniformRandomProvider, RestorableUniformRandomProvider, UniformRandomProvider

public class XoShiRo256Plus
extends AbstractXoShiRo256

A fast 64-bit generator suitable for double generation. This is slightly faster than the all-purpose generator XoShiRo256StarStar.

This is a member of the Xor-Shift-Rotate family of generators. Memory footprint is 256 bits and the period is 2²⁵⁶-1.

Since:

1.3

See Also:

• Original source code
• xorshiro / xoroshiro generators

Field Summary

Fields inherited from class org.apache.commons.rng.core.source64.AbstractXoShiRo256

state0, state1, state2, state3

Constructor Summary

Constructors

Modifier	Constructor	Description
	XoShiRo256Plus(long[] seed)	Creates a new instance.
	XoShiRo256Plus(long seed0, long seed1, long seed2, long seed3)	Creates a new instance using a 4 element seed.
protected	XoShiRo256Plus(XoShiRo256Plus source)	Creates a copy instance.

Method Summary

Modifier and Type	Method	Description
protected XoShiRo256Plus	copy()	Create a copy.
protected long	nextOutput()	Use the current state to compute the next output from the generator.

Methods inherited from class org.apache.commons.rng.core.source64.AbstractXoShiRo256

getStateInternal, jump, longJump, next, setStateInternal

Methods inherited from class org.apache.commons.rng.core.source64.LongProvider

nextBoolean, nextInt, nextLong, resetCachedState

Methods inherited from class org.apache.commons.rng.core.BaseProvider

checkIndex, checkStateSize, composeStateInternal, extendSeed, extendSeed, fillState, fillState, restoreState, saveState, splitStateInternal, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.commons.rng.JumpableUniformRandomProvider

jumps, jumps

Methods inherited from interface org.apache.commons.rng.LongJumpableUniformRandomProvider

longJumps, longJumps

Methods inherited from interface org.apache.commons.rng.UniformRandomProvider

doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, nextBoolean, nextBytes, nextBytes, nextDouble, nextDouble, nextDouble, nextFloat, nextFloat, nextFloat, nextInt, nextInt, nextInt, nextLong, nextLong, nextLong

Constructor Details

XoShiRo256Plus

public XoShiRo256Plus(long[] seed)

Creates a new instance.

Parameters:

seed - Initial seed. If the length is larger than 4, only the first 4 elements will be used; if smaller, the remaining elements will be automatically set. A seed containing all zeros will create a non-functional generator.

XoShiRo256Plus

public XoShiRo256Plus(long seed0,
 long seed1,
 long seed2,
 long seed3)

Creates a new instance using a 4 element seed. A seed containing all zeros will create a non-functional generator.

Parameters:

seed0 - Initial seed element 0.

seed1 - Initial seed element 1.

seed2 - Initial seed element 2.

seed3 - Initial seed element 3.

XoShiRo256Plus

protected XoShiRo256Plus(XoShiRo256Plus source)

Creates a copy instance.

Parameters:

source - Source to copy.

Method Details

nextOutput

protected long nextOutput()

Use the current state to compute the next output from the generator. The output function shall vary with respect to different generators. This method is called from AbstractXoShiRo256.next() before the current state is updated.

Specified by:

nextOutput in class AbstractXoShiRo256

Returns:

the next output

copy

protected XoShiRo256Plus copy()

Create a copy.

Specified by:

copy in class AbstractXoShiRo256

Returns:

the copy