commit | 6ba6aabd580c0be3a34a9b5f8ab5e8591a1d5d7a | [log] [tgz] |
---|---|---|
author | Brian Anderson <andersrb@gmail.com> | Mon Jun 19 17:44:28 2017 -0500 |
committer | GitHub <noreply@github.com> | Mon Jun 19 17:44:28 2017 -0500 |
tree | 185aef91658d00b01174287448eb4cae65caaac1 | |
parent | 83e595c9389b73be89828d401aef1d56dd11480b [diff] | |
parent | a2f434c4722e6534e8cd7d6d12702df9c60adea1 [diff] |
Merge pull request #158 from mbrubeck/doc Document behavior of Rand impls for standard types
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>())
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), with portions covered by various BSD-like licenses.
See LICENSE-APACHE, and LICENSE-MIT for details.