commit | dac5cab014d9e831a330fa761cd061d275dccf9a | [log] [tgz] |
---|---|---|
author | Alex Crichton <alex@alexcrichton.com> | Mon Feb 27 13:36:27 2017 -0600 |
committer | GitHub <noreply@github.com> | Mon Feb 27 13:36:27 2017 -0600 |
tree | 8b00fc36ec7ffce1c85435db278727e776028934 | |
parent | 89f7578361971345ff1a4d6a291e37606ee71244 [diff] | |
parent | c3fb2f642fbb867e001eac4371b390b934301e13 [diff] |
Merge pull request #134 from tomprince/nonblocking-note Add a note about `OsRng` blocking in early init.
A Rust library for random number generators and other randomness functionality.
Add this to your Cargo.toml
:
[dependencies] rand = "0.3"
and this to your crate root:
extern crate rand;
There is built-in support for a random number generator (RNG) associated with each thread stored in thread-local storage. This RNG can be accessed via thread_rng, or used implicitly via random. This RNG is normally randomly seeded from an operating-system source of randomness, e.g. /dev/urandom on Unix systems, and will automatically reseed itself from this source after generating 32 KiB of random data.
let tuple = rand::random::<(f64, char)>(); println!("{:?}", tuple)
use rand::Rng; let mut rng = rand::thread_rng(); if rng.gen() { // random bool println!("i32: {}, u32: {}", rng.gen::<i32>(), rng.gen::<u32>()) }
It is also possible to use other RNG types, which have a similar interface. The following uses the “ChaCha” algorithm instead of the default.
use rand::{Rng, ChaChaRng}; let mut rng = rand::ChaChaRng::new_unseeded(); println!("i32: {}, u32: {}", rng.gen::<i32>(), rng.gen::<u32>())