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Added a Distribution<usize> for Poisson #958

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Added a Distribution<usize> for Poisson #958

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385a2d5
Added a Distribution<usize> for Poisson
CGMossa Apr 2, 2020
fca9cda
Added to_usize
CGMossa Apr 2, 2020
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17 changes: 17 additions & 0 deletions rand_distr/src/poisson.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -147,10 +147,27 @@ where Standard: Distribution<N>
}
}

impl<N: Float> Distribution<usize> for Poisson<N>
where Standard: Distribution<N>
{
#[inline]
fn sample<R: Rng + ?Sized>(&self, rng: &mut R) -> usize {
let result: u64 = self.sample(rng);
result as usize
}
}

#[cfg(test)]
mod test {
use super::*;

#[test]
fn poisson_usize() {
let poisson = Poisson::new(10.0).unwrap();
let mut rng = crate::test::rng(123);
let s_usize: usize = poisson.sample(&mut rng);
}

#[test]
fn test_poisson_10() {
let poisson = Poisson::new(10.0).unwrap();
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