53 wiersze
1.5 KiB
Markdown
53 wiersze
1.5 KiB
Markdown
rand
|
|
====
|
|
|
|
A Rust library for random number generators and other randomness functionality.
|
|
|
|
[](https://travis-ci.org/rust-lang-nursery/rand)
|
|
[](https://ci.appveyor.com/project/alexcrichton/rand)
|
|
|
|
[Documentation](https://doc.rust-lang.org/rand)
|
|
|
|
## Usage
|
|
|
|
Add this to your `Cargo.toml`:
|
|
|
|
```toml
|
|
[dependencies]
|
|
rand = "0.3"
|
|
```
|
|
|
|
and this to your crate root:
|
|
|
|
```rust
|
|
extern crate rand;
|
|
```
|
|
|
|
## Examples
|
|
|
|
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.
|
|
|
|
```rust
|
|
let tuple = rand::random::<(f64, char)>();
|
|
println!("{:?}", tuple)
|
|
```
|
|
|
|
```rust
|
|
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.
|
|
|
|
```rust
|
|
use rand::{Rng, ChaChaRng};
|
|
|
|
let mut rng = rand::ChaChaRng::new_unseeded();
|
|
println!("i32: {}, u32: {}", rng.gen::<i32>(), rng.gen::<u32>())
|
|
```
|
|
|