A wrapper around an f64 to generate Exp(1) random numbers. Dividing by the desired rate lambda will give Exp(lambda) distributed random numbers.

Note that this has to be unwrapped before use as an f64 (using either * or cast::transmute is safe).

Example

use std::rand::distributions::Exp1;

fn main() {
    let exp2 = (*rand::random::<Exp1>()) * 0.5;
    printfln!("%f is from a Exp(2) distribution", exp2);
}