[][src]Struct rand_isaac::isaac64::Isaac64Core

pub struct Isaac64Core { /* fields omitted */ }

The core of Isaac64Rng, used with BlockRng.

Trait Implementations

impl Debug for Isaac64Core[src]

impl Clone for Isaac64Core[src]

impl Serialize for Isaac64Core[src]

impl<'de> Deserialize<'de> for Isaac64Core[src]

impl BlockRngCore for Isaac64Core[src]

type Item = u64

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 Isaac64Rng 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 Isaac64Core[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

Auto Trait Implementations

impl Unpin for Isaac64Core

impl Send for Isaac64Core

impl Sync for Isaac64Core

impl UnwindSafe for Isaac64Core

impl RefUnwindSafe for Isaac64Core

Blanket Implementations

impl<T> From<T> for T[src]

impl<T, U> TryFrom<U> for T where
    U: Into<T>, 

type Error = Infallible

The type returned in the event of a conversion error.

impl<T, U> Into<U> for T where
    U: From<T>, 

impl<T, U> TryInto<U> for T where
    U: TryFrom<T>, 

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

impl<T> BorrowMut<T> for T where
    T: ?Sized

impl<T> Any for T where
    T: 'static + ?Sized

impl<T> ToOwned for T where
    T: Clone

type Owned = T

The resulting type after obtaining ownership.

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