use crate::Uuid; impl Uuid { /// Creates a random UUID. /// /// This uses the [`getrandom`] crate to utilise the operating system's RNG /// as the source of random numbers. If you'd like to use a custom /// generator, don't use this method: generate random bytes using your /// custom generator and pass them to the /// [`uuid::Builder::from_random_bytes`][from_random_bytes] function /// instead. /// /// Note that usage of this method requires the `v4` feature of this crate /// to be enabled. /// /// # Examples /// /// Basic usage: /// /// ``` /// # use uuid::{Uuid, Version}; /// let uuid = Uuid::new_v4(); /// /// assert_eq!(Some(Version::Random), uuid.get_version()); /// ``` /// /// # References /// /// * [Version 4 UUIDs in RFC4122](https://www.rfc-editor.org/rfc/rfc4122#section-4.4) /// /// [`getrandom`]: https://crates.io/crates/getrandom /// [from_random_bytes]: struct.Builder.html#method.from_random_bytes pub fn new_v4() -> Uuid { crate::Builder::from_random_bytes(crate::rng::bytes()).into_uuid() } } #[cfg(test)] mod tests { use super::*; use crate::{Variant, Version}; #[cfg(target_arch = "wasm32")] use wasm_bindgen_test::*; #[test] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] fn test_new() { let uuid = Uuid::new_v4(); assert_eq!(uuid.get_version(), Some(Version::Random)); assert_eq!(uuid.get_variant(), Variant::RFC4122); } #[test] #[cfg_attr(target_arch = "wasm32", wasm_bindgen_test)] fn test_get_version() { let uuid = Uuid::new_v4(); assert_eq!(uuid.get_version(), Some(Version::Random)); assert_eq!(uuid.get_version_num(), 4) } }