PcgMcgXshRr32 (Apache Commons RNG Core 1.7 API)

java.lang.Object
- org.apache.commons.rng.core.BaseProvider
- - org.apache.commons.rng.core.source32.IntProvider
  - - org.apache.commons.rng.core.source32.PcgMcgXshRr32

All Implemented Interfaces:

RandomIntSource, org.apache.commons.rng.RestorableUniformRandomProvider, org.apache.commons.rng.UniformRandomProvider
```
public class PcgMcgXshRr32
extends IntProvider
```
A Permuted Congruential Generator (PCG) that is composed of a 64-bit Multiplicative Congruential Generator (MCG) combined with the XSH-RR (xorshift; random rotate) output transformation to create 32-bit output.
State size is 64 bits and the period is 2⁶².

Since:

1.3

See Also:

PCG, A Family of Better Random Number Generators

Constructor Summary

Constructors
Constructor Description

PcgMcgXshRr32(Long seed)
Creates a new instance.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`protected byte[]`	`getStateInternal()`	Creates a snapshot of the RNG state.
`int`	`next()`	Return the next random value.
`protected void`	`setStateInternal(byte[] s)`	Resets the RNG to the given `state`.
`protected int`	`transform(long x)`	Transform the 64-bit state of the generator to a 32-bit output.

Methods inherited from class org.apache.commons.rng.core.source32.IntProvider
nextBoolean, nextBytes, nextBytes, nextDouble, 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.UniformRandomProvider
doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, nextDouble, nextDouble, nextFloat, nextFloat, nextFloat, nextInt, nextInt, nextLong, nextLong

- Constructor Detail
  - PcgMcgXshRr32
```
public PcgMcgXshRr32(Long seed)
```
    Creates a new instance.
    
    Parameters:
    
    seed - Initial seed.
- Method Detail
  - transform
```
protected int transform(long x)
```
    Transform the 64-bit state of the generator to a 32-bit output. The transformation function shall vary with respect to different generators.
    
    Parameters:
    
    x - State.
    
    Returns:
    
    the output
  - next
```
public int next()
```
    Return the next random value.
    
    Returns:
    
    the next random value.
  - getStateInternal
```
protected byte[] getStateInternal()
```
    Creates a snapshot of the RNG state.
    
    Overrides:
    
    getStateInternal in class IntProvider
    
    Returns:
    
    the internal state.
  - setStateInternal
```
protected void setStateInternal(byte[] s)
```
    Resets the RNG to the given state.
    
    Overrides:
    
    setStateInternal in class IntProvider
    
    Parameters:
    
    s - State (previously obtained by a call to BaseProvider.getStateInternal()).
    
    See Also:
    
    BaseProvider.checkStateSize(byte[],int)