Struct rand::distributions::uniform::UniformFloat

pub struct UniformFloat<X> { /* fields omitted */ }

The back-end implementing UniformSampler for floating-point types.

Unless you are implementing UniformSampler for your own type, this type should not be used directly, use Uniform instead.

Implementation notes

Instead of generating a float in the [0, 1) range using Standard, the UniformFloat implementation converts the output of an PRNG itself. This way one or two steps can be optimized out.

The floats are first converted to a value in the [1, 2) interval using a transmute-based method, and then mapped to the expected range with a multiply and addition. Values produced this way have what equals 22 bits of random digits for an f32, and 52 for an f64.

Trait Implementations

impl UniformSampler for UniformFloat<f32>

type X = f32

The type sampled by this implementation.

fn new<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive lower bound and exclusive upper bound [low, high).

fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive bounds [low, high].

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Self::X

Sample a value.

fn sample_single<R: Rng + ?Sized, B1, B2>(     low_b: B1,     high_b: B2,     rng: &mut R ) -> Self::X where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Sample a single value uniformly from a range with inclusive lower bound and exclusive upper bound [low, high).

impl UniformSampler for UniformFloat<f64>

type X = f64

The type sampled by this implementation.

fn new<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive lower bound and exclusive upper bound [low, high).

fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive bounds [low, high].

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Self::X

Sample a value.

fn sample_single<R: Rng + ?Sized, B1, B2>(     low_b: B1,     high_b: B2,     rng: &mut R ) -> Self::X where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Sample a single value uniformly from a range with inclusive lower bound and exclusive upper bound [low, high).

impl UniformSampler for UniformFloat<f32x2>

type X = f32x2

The type sampled by this implementation.

fn new<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive lower bound and exclusive upper bound [low, high).

fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive bounds [low, high].

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Self::X

Sample a value.

fn sample_single<R: Rng + ?Sized, B1, B2>(     low_b: B1,     high_b: B2,     rng: &mut R ) -> Self::X where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Sample a single value uniformly from a range with inclusive lower bound and exclusive upper bound [low, high).

impl UniformSampler for UniformFloat<f32x4>

type X = f32x4

The type sampled by this implementation.

fn new<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive lower bound and exclusive upper bound [low, high).

fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive bounds [low, high].

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Self::X

Sample a value.

fn sample_single<R: Rng + ?Sized, B1, B2>(     low_b: B1,     high_b: B2,     rng: &mut R ) -> Self::X where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Sample a single value uniformly from a range with inclusive lower bound and exclusive upper bound [low, high).

impl UniformSampler for UniformFloat<f32x8>

type X = f32x8

The type sampled by this implementation.

fn new<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive lower bound and exclusive upper bound [low, high).

fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive bounds [low, high].

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Self::X

Sample a value.

fn sample_single<R: Rng + ?Sized, B1, B2>(     low_b: B1,     high_b: B2,     rng: &mut R ) -> Self::X where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Sample a single value uniformly from a range with inclusive lower bound and exclusive upper bound [low, high).

impl UniformSampler for UniformFloat<f32x16>

type X = f32x16

The type sampled by this implementation.

fn new<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive lower bound and exclusive upper bound [low, high).

fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive bounds [low, high].

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Self::X

Sample a value.

fn sample_single<R: Rng + ?Sized, B1, B2>(     low_b: B1,     high_b: B2,     rng: &mut R ) -> Self::X where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Sample a single value uniformly from a range with inclusive lower bound and exclusive upper bound [low, high).

impl UniformSampler for UniformFloat<f64x2>

type X = f64x2

The type sampled by this implementation.

fn new<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive lower bound and exclusive upper bound [low, high).

fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive bounds [low, high].

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Self::X

Sample a value.

fn sample_single<R: Rng + ?Sized, B1, B2>(     low_b: B1,     high_b: B2,     rng: &mut R ) -> Self::X where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Sample a single value uniformly from a range with inclusive lower bound and exclusive upper bound [low, high).

impl UniformSampler for UniformFloat<f64x4>

type X = f64x4

The type sampled by this implementation.

fn new<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive lower bound and exclusive upper bound [low, high).

fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive bounds [low, high].

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Self::X

Sample a value.

fn sample_single<R: Rng + ?Sized, B1, B2>(     low_b: B1,     high_b: B2,     rng: &mut R ) -> Self::X where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Sample a single value uniformly from a range with inclusive lower bound and exclusive upper bound [low, high).

impl UniformSampler for UniformFloat<f64x8>

type X = f64x8

The type sampled by this implementation.

fn new<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive lower bound and exclusive upper bound [low, high).

fn new_inclusive<B1, B2>(low_b: B1, high_b: B2) -> Self where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Construct self, with inclusive bounds [low, high].

fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> Self::X

Sample a value.

fn sample_single<R: Rng + ?Sized, B1, B2>(     low_b: B1,     high_b: B2,     rng: &mut R ) -> Self::X where     B1: SampleBorrow<Self::X> + Sized,     B2: SampleBorrow<Self::X> + Sized,

Sample a single value uniformly from a range with inclusive lower bound and exclusive upper bound [low, high).

impl<X: Copy> Copy for UniformFloat<X>

impl<X: Clone> Clone for UniformFloat<X>

fn clone(&self) -> UniformFloat<X>

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<X: Debug> Debug for UniformFloat<X>

fn fmt(&self, f: &mut Formatter) -> Result

Formats the value using the given formatter.