Struct rand_pcg::Lcg64Xsh32 [−][src]
pub struct Lcg64Xsh32 { /* fields omitted */ }
A PCG random number generator (XSH RR 64/32 (LCG) variant).
Permuted Congruential Generator with 64-bit state, internal Linear Congruential Generator, and 32-bit output via "xorshift high (bits), random rotation" output function.
This is a 64-bit LCG with explicitly chosen stream with the PCG-XSH-RR
output function. This combination is the standard pcg32
.
Despite the name, this implementation uses 16 bytes (128 bit) space
comprising 64 bits of state and 64 bits stream selector. These are both set
by SeedableRng
, using a 128-bit seed.
Methods
impl Lcg64Xsh32
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impl Lcg64Xsh32
pub fn new(state: u64, stream: u64) -> Self
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pub fn new(state: u64, stream: u64) -> Self
Construct an instance compatible with PCG seed and stream.
Note that PCG specifies default values for both parameters:
state = 0xcafef00dd15ea5e5
stream = 721347520444481703
Trait Implementations
impl Clone for Lcg64Xsh32
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impl Clone for Lcg64Xsh32
fn clone(&self) -> Lcg64Xsh32
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fn clone(&self) -> Lcg64Xsh32
Returns a copy of the value. Read more
fn clone_from(&mut self, source: &Self)
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fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
impl Debug for Lcg64Xsh32
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impl Debug for Lcg64Xsh32
fn fmt(&self, f: &mut Formatter) -> Result
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fn fmt(&self, f: &mut Formatter) -> Result
Formats the value using the given formatter. Read more
impl SeedableRng for Lcg64Xsh32
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impl SeedableRng for Lcg64Xsh32
We use a single 127-bit seed to initialise the state and select a stream.
One seed
bit (lowest bit of seed[8]
) is ignored.
type Seed = [u8; 16]
Seed type, which is restricted to types mutably-dereferencable as u8
arrays (we recommend [u8; N]
for some N
). Read more
fn from_seed(seed: Self::Seed) -> Self
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fn from_seed(seed: Self::Seed) -> Self
Create a new PRNG using the given seed. Read more
fn seed_from_u64(state: u64) -> Self
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fn seed_from_u64(state: u64) -> Self
Create a new PRNG using a u64
seed. Read more
fn from_rng<R>(rng: R) -> Result<Self, Error> where
R: RngCore,
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fn from_rng<R>(rng: R) -> Result<Self, Error> where
R: RngCore,
Create a new PRNG seeded from another Rng
. Read more
impl RngCore for Lcg64Xsh32
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impl RngCore for Lcg64Xsh32
fn next_u32(&mut self) -> u32
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fn next_u32(&mut self) -> u32
Return the next random u32
. Read more
fn next_u64(&mut self) -> u64
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fn next_u64(&mut self) -> u64
Return the next random u64
. Read more
fn fill_bytes(&mut self, dest: &mut [u8])
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fn fill_bytes(&mut self, dest: &mut [u8])
Fill dest
with random data. Read more
fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>
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fn try_fill_bytes(&mut self, dest: &mut [u8]) -> Result<(), Error>
Fill dest
entirely with random data. Read more
Auto Trait Implementations
impl Send for Lcg64Xsh32
impl Send for Lcg64Xsh32
impl Sync for Lcg64Xsh32
impl Sync for Lcg64Xsh32