commit | 0e369b44b5866731ddd01f5ea6be4ad99fdc4e27 | [log] [tgz] |
---|---|---|
author | Diggory Hardy <git@dhardy.name> | Mon Dec 11 16:57:52 2017 +0000 |
committer | Diggory Hardy <git@dhardy.name> | Mon Dec 11 16:57:52 2017 +0000 |
tree | 0c2181a17d652403ad70ad78a5d3b5b32b8484fa | |
parent | d1ed3777caaa6e60c295249258d1202410860563 [diff] |
Update version number in changelog [ci skip]
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;
The ‘master’ branch tracks development code while the ‘0.3’ branch tracks the latest stable release. New features are currently being released in an “unstable channel”; if you wish to opt-in to the latest releases (expect more breaking changes in this channel) specify rand = "0.4.0-pre.0"
.
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>())
derive(Rand)
You can derive the Rand
trait for your custom type via the #[derive(Rand)]
directive. To use this first add this to your Cargo.toml:
rand = "0.3" rand_derive = "0.3"
Next in your crate:
extern crate rand; #[macro_use] extern crate rand_derive; #[derive(Rand, Debug)] struct MyStruct { a: i32, b: u32, } fn main() { println!("{:?}", rand::random::<MyStruct>()); }
rand
is primarily distributed under the terms of both the MIT license and the Apache License (Version 2.0).
See LICENSE-APACHE, and LICENSE-MIT for details.