src/test/run-pass/deriving-hash.rs

   1 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
   2 // file at the top-level directory of this distribution and at
   3 // http://rust-lang.org/COPYRIGHT.
   4 //
   5 // Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
   6 // http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   7 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
   8 // option. This file may not be copied, modified, or distributed
   9 // except according to those terms.
  10
  11
  12 #![feature(hash_default)]
  13
  14 use std::hash::{Hash, SipHasher};
  15
  16 #[derive(Hash)]
  17 struct Person {
  18     id: usize,
  19     name: String,
  20     phone: usize,
  21 }
  22
  23 fn hash<T: Hash>(t: &T) -> u64 {
  24     std::hash::hash::<T, SipHasher>(t)
  25 }
  26
  27 fn main() {
  28     let person1 = Person {
  29         id: 5,
  30         name: "Janet".to_string(),
  31         phone: 555_666_7777
  32     };
  33     let person2 = Person {
  34         id: 5,
  35         name: "Bob".to_string(),
  36         phone: 555_666_7777
  37     };
  38     assert_eq!(hash(&person1), hash(&person1));
  39     assert!(hash(&person1) != hash(&person2));
  40 }