Hash

Performing a hash on a type.

Derivable: ✅

When to implement: Almost always.

#![allow(unused)]
fn main() {
// Copyright 2025 Google LLC
// SPDX-License-Identifier: Apache-2.0

// pub trait Hash {
//     // Required method
//     fn hash<H>(&self, state: &mut H)
//        where H: Hasher;
//
//     // Provided method
//     fn hash_slice<H>(data: &[Self], state: &mut H)
//        where H: Hasher,
//              Self: Sized { ... }
// }

#[derive(Hash)]
pub struct User {
    id: u32,
    name: String,
    friends: Vec<u32>,
}
}