3 use std::default::Default;
4 use std::hash::{BuildHasher, Hash, Hasher};
12 impl const Default for MyHasher {
13 fn default() -> MyHasher {
18 impl const Hasher for MyHasher {
19 fn write(&mut self, buf: &[u8]) {
20 // FIXME(const_trait_impl): change to for loop
23 self.hash += buf[i] as u64;
27 fn write_str(&mut self, s: &str) {
28 self.write(s.as_bytes());
31 fn finish(&self) -> u64 {
37 fn test_writer_hasher() {
38 const fn hash<T: ~const Hash>(t: &T) -> u64 {
39 let mut s = MyHasher { hash: 0 };
45 // FIXME(fee1-dead): assert_eq
46 assert!(hash(&()) == 0);
47 assert!(hash(&5_u8) == 5);
48 assert!(hash(&5_u16) == 5);
49 assert!(hash(&5_u32) == 5);
51 assert!(hash(&'a') == 97);
54 assert!(hash(&s) == 97 + 0xFF);
57 assert_eq!(hash(&()), 0);
59 assert_eq!(hash(&5_u8), 5);
60 assert_eq!(hash(&5_u16), 5);
61 assert_eq!(hash(&5_u32), 5);
62 assert_eq!(hash(&5_u64), 5);
63 assert_eq!(hash(&5_usize), 5);
65 assert_eq!(hash(&5_i8), 5);
66 assert_eq!(hash(&5_i16), 5);
67 assert_eq!(hash(&5_i32), 5);
68 assert_eq!(hash(&5_i64), 5);
69 assert_eq!(hash(&5_isize), 5);
71 assert_eq!(hash(&false), 0);
72 assert_eq!(hash(&true), 1);
74 assert_eq!(hash(&'a'), 97);
77 assert_eq!(hash(&s), 97 + 0xFF);
78 let s: Box<str> = String::from("a").into_boxed_str();
79 assert_eq!(hash(&s), 97 + 0xFF);
80 let s: Rc<&str> = Rc::new("a");
81 assert_eq!(hash(&s), 97 + 0xFF);
82 let cs: &[u8] = &[1, 2, 3];
83 assert_eq!(hash(&cs), 9);
84 let cs: Box<[u8]> = Box::new([1, 2, 3]);
85 assert_eq!(hash(&cs), 9);
86 let cs: Rc<[u8]> = Rc::new([1, 2, 3]);
87 assert_eq!(hash(&cs), 9);
89 let ptr = ptr::invalid::<i32>(5_usize);
90 assert_eq!(hash(&ptr), 5);
92 let ptr = ptr::invalid_mut::<i32>(5_usize);
93 assert_eq!(hash(&ptr), 5);
96 // Miri cannot hash pointers
100 let cs: &mut [u8] = &mut [1, 2, 3];
101 let ptr = cs.as_ptr();
102 let slice_ptr = cs as *const [u8];
103 assert_eq!(hash(&slice_ptr), hash(&ptr) + cs.len() as u64);
105 let slice_ptr = cs as *mut [u8];
106 assert_eq!(hash(&slice_ptr), hash(&ptr) + cs.len() as u64);
112 struct CustomHasher {
116 impl const Hasher for CustomHasher {
117 fn finish(&self) -> u64 {
120 fn write(&mut self, _: &[u8]) {
123 fn write_u64(&mut self, data: u64) {
128 impl const Default for CustomHasher {
129 fn default() -> CustomHasher {
130 CustomHasher { output: 0 }
134 impl const Hash for Custom {
135 fn hash<H: ~const Hasher>(&self, state: &mut H) {
136 state.write_u64(self.hash);
141 fn test_custom_state() {
142 const fn hash<T: ~const Hash>(t: &T) -> u64 {
143 let mut c = CustomHasher { output: 0 };
148 assert_eq!(hash(&Custom { hash: 5 }), 5);
150 const { assert!(hash(&Custom { hash: 6 }) == 6) };
153 // FIXME: Instantiated functions with i128 in the signature is not supported in Emscripten.
154 // See https://github.com/kripken/emscripten-fastcomp/issues/169
155 #[cfg(not(target_os = "emscripten"))]
157 fn test_indirect_hasher() {
158 let mut hasher = MyHasher { hash: 0 };
160 let mut indirect_hasher: &mut dyn Hasher = &mut hasher;
161 5u32.hash(&mut indirect_hasher);
163 assert_eq!(hasher.hash, 5);
167 fn test_build_hasher_object_safe() {
168 use std::collections::hash_map::{DefaultHasher, RandomState};
170 let _: &dyn BuildHasher<Hasher = DefaultHasher> = &RandomState::new();
173 // just tests by whether or not this compiles
174 fn _build_hasher_default_impl_all_auto_traits<T>() {
175 use std::panic::{RefUnwindSafe, UnwindSafe};
176 fn all_auto_traits<T: Send + Sync + Unpin + UnwindSafe + RefUnwindSafe>() {}
178 all_auto_traits::<std::hash::BuildHasherDefault<T>>();