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use crate::prelude::*;
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_bytes`][from_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;
///
/// let uuid = Uuid::new_v4();
/// ```
///
/// [`getrandom`]: https://crates.io/crates/getrandom
/// [from_bytes]: struct.Builder.html#method.from_bytes
pub fn new_v4() -> Uuid {
let mut bytes = [0u8; 16];
getrandom::getrandom(&mut bytes).unwrap_or_else(|err| {
// NB: getrandom::Error has no source; this is adequate display
panic!("could not retreive random bytes for uuid: {}", err)
});
crate::Builder::from_bytes(bytes)
.set_variant(Variant::RFC4122)
.set_version(Version::Random)
.build()
}
}
#[cfg(test)]
mod tests {
use crate::prelude::*;
#[test]
fn test_new() {
let uuid = Uuid::new_v4();
assert_eq!(uuid.get_version(), Some(Version::Random));
assert_eq!(uuid.get_variant(), Some(Variant::RFC4122));
}
#[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)
}
}
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