Class DotyHumphreySmallFastCounting64
java.lang.Object
org.apache.commons.rng.core.BaseProvider
org.apache.commons.rng.core.source64.LongProvider
org.apache.commons.rng.core.source64.DotyHumphreySmallFastCounting64
- All Implemented Interfaces:
RandomLongSource
,RestorableUniformRandomProvider
,UniformRandomProvider
Implement the Small, Fast, Counting (SFC) 64-bit generator of Chris Doty-Humphrey.
The original source is the PractRand test suite by the same author.
The state size is 256-bits; the period is a minimum of 264 and an average of approximately 2255.
- Since:
- 1.3
- See Also:
-
Field Summary
Fields -
Constructor Summary
ConstructorsConstructorDescriptionDotyHumphreySmallFastCounting64
(long[] seed) Creates an instance with the given seed. -
Method Summary
Modifier and TypeMethodDescriptionprotected byte[]
Creates a snapshot of the RNG state.final long
next()
Return the next random value.private void
setSeedInternal
(long[] seed) Seeds the RNG.protected void
setStateInternal
(byte[] s) Resets the RNG to the givenstate
.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
-
Field Details
-
SEED_SIZE
private static final int SEED_SIZESize of the seed.- See Also:
-
a
private long aState a. -
b
private long bState b. -
c
private long cState c. -
counter
private long counterCounter.
-
-
Constructor Details
-
DotyHumphreySmallFastCounting64
public DotyHumphreySmallFastCounting64(long[] seed) Creates an instance with the given seed.- Parameters:
seed
- Initial seed. If the length is larger than 3, only the first 3 elements will be used; if smaller, the remaining elements will be automatically set.
-
-
Method Details
-
setSeedInternal
private void setSeedInternal(long[] seed) Seeds the RNG.- Parameters:
seed
- Seed.
-
next
public final long 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 classLongProvider
- Returns:
- the internal state.
-
setStateInternal
protected void setStateInternal(byte[] s) Resets the RNG to the givenstate
.- Overrides:
setStateInternal
in classLongProvider
- Parameters:
s
- State (previously obtained by a call toBaseProvider.getStateInternal()
).- See Also:
-