Trait ChooseRandomly

pub trait ChooseRandomly {
    type Cache;

    // Required methods
    fn choose_randomly(fractions: &Vec<Self>) -> Result<usize>
       where Self: Sized;
    fn choose_randomly_create_cache<'a>(
        fractions: impl Iterator<Item = &'a Self>,
    ) -> Result<Self::Cache>
       where Self: Sized + 'a;
    fn choose_randomly_cached(cache: &Self::Cache) -> usize
       where Self: Sized;
}

Required Associated Types

type Cache

Required Methods

fn choose_randomly(fractions: &Vec<Self>) -> Result<usize>

where Self: Sized,

Return a random index from 0 (inclusive) to the length of the list (exclusive). The likelihood of each index to be returned is proportional to the value of the fraction at that index.

The fractions do not need to sum to 1.

fn choose_randomly_create_cache<'a>( fractions: impl Iterator<Item = &'a Self>, ) -> Result<Self::Cache>

where Self: Sized + 'a,

fn choose_randomly_cached(cache: &Self::Cache) -> usize

where Self: Sized,

Implementors

impl ChooseRandomly for FractionEnum

type Cache = FractionRandomCacheEnum

impl ChooseRandomly for FractionExact

type Cache = FractionRandomCacheExact

impl ChooseRandomly for FractionF64

type Cache = FractionRandomCacheF64