Crate rand

Utilities for random number generation

The Rng trait covers random number generation, and can be used directly to produce values of some core types (u32, u64, f32, f64, and byte strings). To generate anything else, or to generate values of the above type in generic code, use the distributions module. This includes distributions like ranges, normal and exponential.

Crate rand_core

Random number generation traits

This crate is mainly of interest to crates publishing implementations of Rng. Other users are encouraged to use the rand crate instead.

Rng is the core trait implemented by algorithmic pseudo-random number generators and external random-number sources.

SeedFromRng and SeedableRng are extension traits for construction and reseeding.

Error is provided for error-handling. It is safe to use in no_std environments.

The impls sub-module includes a few small functions to assist implementation of Rng. Since this module is only of interest to Rng implementors, it is not re-exported from rand.

The mock module includes a mock Rng implementation. Even though this is only useful for testing, it is currently always built.