dhardy / rand

http://doc.rust-lang.org/rand
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Rand

Build Status Build Status Crate Book API API Minimum rustc version

A Rust library for random number generation.

Rand provides utilities to generate random numbers, to convert them to useful types and distributions, and some randomness-related algorithms.

The core random number generation traits of Rand live in the rand_core crate but are also exposed here; RNG implementations should prefer to use rand_core while most other users should depend on rand.

Documentation:

Usage

Add this to your Cargo.toml:

[dependencies]
rand = "0.7"

To get started using Rand, see The Book.

Versions

Rand libs have inter-dependencies and make use of the semver trick in order to make traits compatible across crate versions. (This is especially important for RngCore and SeedableRng.) A few crate releases are thus compatibility shims, depending on the next lib version (e.g. rand_core versions 0.2.2 and 0.3.1). This means, for example, that rand_core_0_4_0::SeedableRng and rand_core_0_3_0::SeedableRng are distinct, incompatible traits, which can cause build errors. Usually, running cargo update is enough to fix any issues.

The Rand lib is not yet stable, however we are careful to limit breaking changes and warn via deprecation wherever possible. Patch versions never introduce breaking changes. The following minor versions are supported:

A detailed changelog is available.

When upgrading to the next minor series (especially 0.4 → 0.5), we recommend reading the Upgrade Guide.

Yanked versions

Some versions of Rand crates have been yanked ("unreleased"). Where this occurs, the crate's CHANGELOG should be updated with a rationale, and a search on the issue tracker with the keyword yank should uncover the motivation.

Rust version requirements

Since version 0.7, Rand requires Rustc version 1.32 or greater. Rand 0.5 requires Rustc 1.22 or greater while versions 0.4 and 0.3 (since approx. June 2017) require Rustc version 1.15 or greater. Subsets of the Rand code may work with older Rust versions, but this is not supported.

Travis CI always has a build with a pinned version of Rustc matching the oldest supported Rust release. The current policy is that this can be updated in any Rand release if required, but the change must be noted in the changelog.

Crate Features

Rand is built with these features enabled by default:

Optionally, the following dependencies can be enabled:

Additionally, these features configure Rand:

Rand supports limited functionality in no_std mode (enabled via default-features = false). In this case, OsRng and from_entropy are unavailable (unless getrandom is enabled), large parts of seq are unavailable (unless alloc is enabled), and thread_rng and random are unavailable.

License

Rand is distributed under the terms of both the MIT license and the Apache License (Version 2.0).

See LICENSE-APACHE and LICENSE-MIT, and COPYRIGHT for details.