3 use std::default::Default;
4 use std::hash::{BuildHasher, Hash, Hasher};
11 impl Default for MyHasher {
12 fn default() -> MyHasher {
17 impl Hasher for MyHasher {
18 fn write(&mut self, buf: &[u8]) {
20 self.hash += *byte as u64;
23 fn finish(&self) -> u64 {
29 fn test_writer_hasher() {
30 fn hash<T: Hash>(t: &T) -> u64 {
31 let mut s = MyHasher { hash: 0 };
36 assert_eq!(hash(&()), 0);
38 assert_eq!(hash(&5_u8), 5);
39 assert_eq!(hash(&5_u16), 5);
40 assert_eq!(hash(&5_u32), 5);
41 assert_eq!(hash(&5_u64), 5);
42 assert_eq!(hash(&5_usize), 5);
44 assert_eq!(hash(&5_i8), 5);
45 assert_eq!(hash(&5_i16), 5);
46 assert_eq!(hash(&5_i32), 5);
47 assert_eq!(hash(&5_i64), 5);
48 assert_eq!(hash(&5_isize), 5);
50 assert_eq!(hash(&false), 0);
51 assert_eq!(hash(&true), 1);
53 assert_eq!(hash(&'a'), 97);
56 assert_eq!(hash(&s), 97 + 0xFF);
57 let s: Box<str> = String::from("a").into_boxed_str();
58 assert_eq!(hash(&s), 97 + 0xFF);
59 let s: Rc<&str> = Rc::new("a");
60 assert_eq!(hash(&s), 97 + 0xFF);
61 let cs: &[u8] = &[1, 2, 3];
62 assert_eq!(hash(&cs), 9);
63 let cs: Box<[u8]> = Box::new([1, 2, 3]);
64 assert_eq!(hash(&cs), 9);
65 let cs: Rc<[u8]> = Rc::new([1, 2, 3]);
66 assert_eq!(hash(&cs), 9);
68 let ptr = 5_usize as *const i32;
69 assert_eq!(hash(&ptr), 5);
71 let ptr = 5_usize as *mut i32;
72 assert_eq!(hash(&ptr), 5);
75 // Miri cannot hash pointers
79 let cs: &mut [u8] = &mut [1, 2, 3];
80 let ptr = cs.as_ptr();
81 let slice_ptr = cs as *const [u8];
82 assert_eq!(hash(&slice_ptr), hash(&ptr) + cs.len() as u64);
84 let slice_ptr = cs as *mut [u8];
85 assert_eq!(hash(&slice_ptr), hash(&ptr) + cs.len() as u64);
95 impl Hasher for CustomHasher {
96 fn finish(&self) -> u64 {
99 fn write(&mut self, _: &[u8]) {
102 fn write_u64(&mut self, data: u64) {
107 impl Default for CustomHasher {
108 fn default() -> CustomHasher {
109 CustomHasher { output: 0 }
113 impl Hash for Custom {
114 fn hash<H: Hasher>(&self, state: &mut H) {
115 state.write_u64(self.hash);
120 fn test_custom_state() {
121 fn hash<T: Hash>(t: &T) -> u64 {
122 let mut c = CustomHasher { output: 0 };
127 assert_eq!(hash(&Custom { hash: 5 }), 5);
130 // FIXME: Instantiated functions with i128 in the signature is not supported in Emscripten.
131 // See https://github.com/kripken/emscripten-fastcomp/issues/169
132 #[cfg(not(target_os = "emscripten"))]
134 fn test_indirect_hasher() {
135 let mut hasher = MyHasher { hash: 0 };
137 let mut indirect_hasher: &mut dyn Hasher = &mut hasher;
138 5u32.hash(&mut indirect_hasher);
140 assert_eq!(hasher.hash, 5);
144 fn test_build_hasher_object_safe() {
145 use std::collections::hash_map::{DefaultHasher, RandomState};
147 let _: &dyn BuildHasher<Hasher = DefaultHasher> = &RandomState::new();
150 // just tests by whether or not this compiles
151 fn _build_hasher_default_impl_all_auto_traits<T>() {
152 use std::panic::{RefUnwindSafe, UnwindSafe};
153 fn all_auto_traits<T: Send + Sync + Unpin + UnwindSafe + RefUnwindSafe>() {}
155 all_auto_traits::<std::hash::BuildHasherDefault<T>>();