117 lines
2.8 KiB
Rust
117 lines
2.8 KiB
Rust
// Copyright 2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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use std::mem;
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use std::hash::{Hash, Hasher, Writer};
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use std::default::Default;
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struct MyHasher {
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hash: u64,
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}
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impl Default for MyHasher {
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fn default() -> MyHasher {
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MyHasher { hash: 0 }
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}
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}
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impl Writer for MyHasher {
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// Most things we'll just add up the bytes.
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fn write(&mut self, buf: &[u8]) {
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for byte in buf.iter() {
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self.hash += *byte as u64;
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}
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}
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}
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impl Hasher for MyHasher {
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type Output = u64;
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fn reset(&mut self) { self.hash = 0; }
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fn finish(&self) -> u64 { self.hash }
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}
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#[test]
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fn test_writer_hasher() {
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fn hash<T: Hash<MyHasher>>(t: &T) -> u64 {
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::std::hash::hash::<_, MyHasher>(t)
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}
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assert_eq!(hash(&()), 0);
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assert_eq!(hash(&5u8), 5);
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assert_eq!(hash(&5u16), 5);
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assert_eq!(hash(&5u32), 5);
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assert_eq!(hash(&5u64), 5);
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assert_eq!(hash(&5us), 5);
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assert_eq!(hash(&5i8), 5);
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assert_eq!(hash(&5i16), 5);
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assert_eq!(hash(&5i32), 5);
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assert_eq!(hash(&5i64), 5);
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assert_eq!(hash(&5is), 5);
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assert_eq!(hash(&false), 0);
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assert_eq!(hash(&true), 1);
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assert_eq!(hash(&'a'), 97);
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let s: &str = "a";
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assert_eq!(hash(& s), 97 + 0xFF);
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// FIXME (#18283) Enable test
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//let s: Box<str> = box "a";
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//assert_eq!(hasher.hash(& s), 97 + 0xFF);
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let cs: &[u8] = &[1u8, 2u8, 3u8];
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assert_eq!(hash(& cs), 9);
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let cs: Box<[u8]> = box [1u8, 2u8, 3u8];
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assert_eq!(hash(& cs), 9);
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// FIXME (#18248) Add tests for hashing Rc<str> and Rc<[T]>
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unsafe {
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let ptr: *const i32 = mem::transmute(5us);
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assert_eq!(hash(&ptr), 5);
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}
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unsafe {
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let ptr: *mut i32 = mem::transmute(5us);
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assert_eq!(hash(&ptr), 5);
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}
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}
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struct Custom { hash: u64 }
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struct CustomHasher { output: u64 }
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impl Hasher for CustomHasher {
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type Output = u64;
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fn reset(&mut self) { self.output = 0; }
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fn finish(&self) -> u64 { self.output }
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}
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impl Default for CustomHasher {
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fn default() -> CustomHasher {
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CustomHasher { output: 0 }
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}
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}
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impl Hash<CustomHasher> for Custom {
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fn hash(&self, state: &mut CustomHasher) {
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state.output = self.hash;
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}
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}
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#[test]
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fn test_custom_state() {
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fn hash<T: Hash<CustomHasher>>(t: &T) -> u64 {
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::std::hash::hash::<_, CustomHasher>(t)
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}
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assert_eq!(hash(&Custom { hash: 5 }), 5);
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}
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