[−][src]Struct rand_isaac::isaac::IsaacCore
The core of IsaacRng
, used with BlockRng
.
Trait Implementations
impl Debug for IsaacCore
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impl Clone for IsaacCore
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impl SeedableRng for IsaacCore
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type Seed = [u8; 32]
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 seed_from_u64(seed: u64) -> Self
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Create an ISAAC random number generator using an u64
as seed.
If seed == 0
this will produce the same stream of random numbers as
the reference implementation when used unseeded.
fn from_rng<R: RngCore>(rng: R) -> Result<Self, Error>
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impl BlockRngCore for IsaacCore
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type Item = u32
Results element type, e.g. u32
.
type Results = IsaacArray<Self::Item>
Results type. This is the 'block' an RNG implementing BlockRngCore
generates, which will usually be an array like [u32; 16]
. Read more
fn generate(&mut self, results: &mut IsaacArray<Self::Item>)
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Refills the output buffer, results
. See also the pseudocode desciption
of the algorithm in the IsaacRng
documentation.
Optimisations used (similar to the reference implementation):
- The loop is unrolled 4 times, once for every constant of mix().
- The contents of the main loop are moved to a function
rngstep
, to reduce code duplication. - We use local variables for a and b, which helps with optimisations.
- We split the main loop in two, one that operates over 0..128 and one
over 128..256. This way we can optimise out the addition and modulus
from
s[i+128 mod 256]
. - We maintain one index
i
and addm
orm2
as base (m2 for thes[i+128 mod 256]
), relying on the optimizer to turn it into pointer arithmetic. - We fill
results
backwards. The reference implementation reads values fromresults
in reverse. We read them in the normal direction, to makefill_bytes
a memcopy. To maintain compatibility we fill in reverse.
Auto Trait Implementations
impl Unpin for IsaacCore
impl Send for IsaacCore
impl Sync for IsaacCore
impl UnwindSafe for IsaacCore
impl RefUnwindSafe for IsaacCore
Blanket Implementations
impl<T> From<T> for T
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impl<T, U> TryFrom<U> for T where
U: Into<T>,
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U: Into<T>,
type Error = Infallible
The type returned in the event of a conversion error.
fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>
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impl<T, U> Into<U> for T where
U: From<T>,
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U: From<T>,
impl<T, U> TryInto<U> for T where
U: TryFrom<T>,
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U: TryFrom<T>,
type Error = <U as TryFrom<T>>::Error
The type returned in the event of a conversion error.
fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>
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impl<T> Borrow<T> for T where
T: ?Sized,
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T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
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T: ?Sized,
fn borrow_mut(&mut self) -> &mut T
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impl<T> Any for T where
T: 'static + ?Sized,
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T: 'static + ?Sized,
impl<T> ToOwned for T where
T: Clone,
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T: Clone,