[][src]Struct rand_isaac::isaac::IsaacCore

pub struct IsaacCore { /* fields omitted */ }

The core of IsaacRng, used with BlockRng.

Trait Implementations

impl Debug for IsaacCore[src]

impl Clone for IsaacCore[src]

fn clone_from(&mut self, source: &Self)1.0.0[src]

Performs copy-assignment from source. Read more

impl Serialize for IsaacCore[src]

impl<'de> Deserialize<'de> for IsaacCore[src]

impl BlockRngCore for IsaacCore[src]

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>)[src]

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 add m or m2 as base (m2 for the s[i+128 mod 256]), relying on the optimizer to turn it into pointer arithmetic.
  • We fill results backwards. The reference implementation reads values from results in reverse. We read them in the normal direction, to make fill_bytes a memcopy. To maintain compatibility we fill in reverse.

impl SeedableRng for IsaacCore[src]

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 seed_from_u64(seed: u64) -> Self[src]

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_entropy() -> Self[src]

Creates a new instance of the RNG seeded via [getrandom]. Read more

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, U> TryFrom<U> for T where
    U: Into<T>, 
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type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> Into<U> for T where
    U: From<T>, 
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impl<T> From<T> for T[src]

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 
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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.

impl<T> Borrow<T> for T where
    T: ?Sized
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impl<T> BorrowMut<T> for T where
    T: ?Sized
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impl<T> Any for T where
    T: 'static + ?Sized
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impl<T> ToOwned for T where
    T: Clone
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type Owned = T

The resulting type after obtaining ownership.

impl<T> DeserializeOwned for T where
    T: Deserialize<'de>, 
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