UUID

Recipe	Crates	Categories
Generate and parse UUIDs

A UUID is a unique 128-bit value, stored as 16 octets, and regularly formatted as a hex string in five groups. UUIDs are used to assign unique identifiers to entities without requiring a central allocating authority. They are particularly useful in distributed systems, though can be used in disparate areas, such as databases and network protocols.

Generate and parse UUIDs

uuid generates and parses UUIDs and implements a number of utility functions.

use uuid::Uuid;
use uuid::uuid;

fn main() {
    // Generate a new UUID (version 4)
    let my_uuid = Uuid::new_v4();
    println!("Generated UUID: {}", my_uuid);

    // Parse a UUID from a string
    let uuid_str = "550e8400-e29b-41d4-a716-446655440000";
    match Uuid::parse_str(uuid_str) {
        Ok(parsed_uuid) => println!("Parsed UUID: {}", parsed_uuid),
        Err(e) => println!("Failed to parse UUID: {}", e),
    }
    // Use a macro
    const ID: Uuid = uuid!("67e55044-10b1-426f-9247-bb680e5fe0c8");
    // Print as a URN
    println!("{}", ID.urn());

    // Compare UUIDs
    let another_uuid = Uuid::new_v4();
    if my_uuid == another_uuid {
        println!("The UUIDs are equal.");
    } else {
        println!("The UUIDs are different.");
    }
}