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Trait rand::distributions::uniform::UniformSampler

source · [−]
pub trait UniformSampler: Sized {
    type X;
    fn new<B1, B2>(low: B1, high: B2) -> Self
    where
        B1: SampleBorrow<Self::X> + Sized,
        B2: SampleBorrow<Self::X> + Sized;

    fn new_inclusive<B1, B2>(low: B1, high: B2) -> Self
    where
        B1: SampleBorrow<Self::X> + Sized,
        B2: SampleBorrow<Self::X> + Sized;

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

    fn sample_single<R: Rng + ?Sized, B1, B2>(
        low: B1, 
        high: B2, 
        rng: &mut R
    ) -> Self::X
    where
        B1: SampleBorrow<Self::X> + Sized,
        B2: SampleBorrow<Self::X> + Sized,
    { ... }
}
Expand description

Helper trait handling actual uniform sampling.

See the module documentation on how to implement Uniform range sampling for a custom type.

Implementation of sample_single is optional, and is only useful when the implementation can be faster than Self::new(low, high).sample(rng).

Associated Types

The type sampled by this implementation.

Required methods

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

Usually users should not call this directly but instead use Uniform::new, which asserts that low < high before calling this.

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

Usually users should not call this directly but instead use Uniform::new_inclusive, which asserts that low <= high before calling this.

Sample a value.

Provided methods

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

Usually users should not call this directly but instead use Uniform::sample_single, which asserts that low < high before calling this.

Via this method, implementations can provide a method optimized for sampling only a single value from the specified range. The default implementation simply calls UniformSampler::new then sample on the result.

Implementors