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//! Items related to randomness and random number generators. Also provides some high-level helper //! functions. //! //! Helper functions include [**random_f32()**](./fn.random_f32.html), //! [**random_f64()**](./fn.random_f64.html) and [**random_range(min, //! max)**](./fn.random_range.html). pub use rand; pub use self::rand::*; /// A wrapper function around the `random` function that avoids the need for specifying a type in /// the case that it cannot be inferred. The primary purpose for this is to simplify the random API /// for new rust users. pub fn random_f32() -> f32 { random() } /// A wrapper function around the `random` function that avoids the need for specifying a type in /// the case that it cannot be inferred. The primary purpose for this is to simplify the random API /// for new rust users. pub fn random_f64() -> f64 { random() } /// A function for generating a random value within the given range. /// /// The generated value may be within the range [min, max). That is, the result is inclusive of /// `min`, but will never be `max`. /// /// If the given `min` is greater than the given `max`, they will be swapped before calling /// `gen_range` internally to avoid triggering a `panic!`. /// /// This calls `rand::thread_rng().gen_range(min, max)` internally, in turn using the thread-local /// default random number generator. pub fn random_range<T>(min: T, max: T) -> T where T: PartialOrd + distributions::uniform::SampleUniform, { let (min, max) = if min <= max { (min, max) } else { (max, min) }; rand::thread_rng().gen_range(min, max) } /// Generates and returns a random ascii character. /// /// The ascii characters that can be generated are: /// /// ABCDEFGHIJKLMNOPQRSTUVWXYZ\ /// abcdefghijklmnopqrstuvwxyz\ /// 0123456789)(*&^%$#@!~. pub fn random_ascii() -> char { const ASCIISET: &[u8] = b"ABCDEFGHIJKLMNOPQRSTUVWXYZ\ abcdefghijklmnopqrstuvwxyz\ 0123456789)(*&^%$#@!~. "; let idx = rand::thread_rng().gen_range(0, ASCIISET.len()); ASCIISET[idx] as char }