| mod sip; |
| |
| use std::default::Default; |
| use std::hash::{Hash, Hasher}; |
| use std::rc::Rc; |
| |
| struct MyHasher { |
| hash: u64, |
| } |
| |
| impl Default for MyHasher { |
| fn default() -> MyHasher { |
| MyHasher { hash: 0 } |
| } |
| } |
| |
| impl Hasher for MyHasher { |
| fn write(&mut self, buf: &[u8]) { |
| for byte in buf { |
| self.hash += *byte as u64; |
| } |
| } |
| fn finish(&self) -> u64 { |
| self.hash |
| } |
| } |
| |
| #[test] |
| fn test_writer_hasher() { |
| fn hash<T: Hash>(t: &T) -> u64 { |
| let mut s = MyHasher { hash: 0 }; |
| t.hash(&mut s); |
| s.finish() |
| } |
| |
| assert_eq!(hash(&()), 0); |
| |
| assert_eq!(hash(&5_u8), 5); |
| assert_eq!(hash(&5_u16), 5); |
| assert_eq!(hash(&5_u32), 5); |
| assert_eq!(hash(&5_u64), 5); |
| assert_eq!(hash(&5_usize), 5); |
| |
| assert_eq!(hash(&5_i8), 5); |
| assert_eq!(hash(&5_i16), 5); |
| assert_eq!(hash(&5_i32), 5); |
| assert_eq!(hash(&5_i64), 5); |
| assert_eq!(hash(&5_isize), 5); |
| |
| assert_eq!(hash(&false), 0); |
| assert_eq!(hash(&true), 1); |
| |
| assert_eq!(hash(&'a'), 97); |
| |
| let s: &str = "a"; |
| assert_eq!(hash(&s), 97 + 0xFF); |
| let s: Box<str> = String::from("a").into_boxed_str(); |
| assert_eq!(hash(&s), 97 + 0xFF); |
| let s: Rc<&str> = Rc::new("a"); |
| assert_eq!(hash(&s), 97 + 0xFF); |
| let cs: &[u8] = &[1, 2, 3]; |
| assert_eq!(hash(&cs), 9); |
| let cs: Box<[u8]> = Box::new([1, 2, 3]); |
| assert_eq!(hash(&cs), 9); |
| let cs: Rc<[u8]> = Rc::new([1, 2, 3]); |
| assert_eq!(hash(&cs), 9); |
| |
| let ptr = 5_usize as *const i32; |
| assert_eq!(hash(&ptr), 5); |
| |
| let ptr = 5_usize as *mut i32; |
| assert_eq!(hash(&ptr), 5); |
| |
| if cfg!(miri) { |
| // Miri cannot hash pointers |
| return; |
| } |
| |
| let cs: &mut [u8] = &mut [1, 2, 3]; |
| let ptr = cs.as_ptr(); |
| let slice_ptr = cs as *const [u8]; |
| assert_eq!(hash(&slice_ptr), hash(&ptr) + cs.len() as u64); |
| |
| let slice_ptr = cs as *mut [u8]; |
| assert_eq!(hash(&slice_ptr), hash(&ptr) + cs.len() as u64); |
| } |
| |
| struct Custom { |
| hash: u64, |
| } |
| struct CustomHasher { |
| output: u64, |
| } |
| |
| impl Hasher for CustomHasher { |
| fn finish(&self) -> u64 { |
| self.output |
| } |
| fn write(&mut self, _: &[u8]) { |
| panic!() |
| } |
| fn write_u64(&mut self, data: u64) { |
| self.output = data; |
| } |
| } |
| |
| impl Default for CustomHasher { |
| fn default() -> CustomHasher { |
| CustomHasher { output: 0 } |
| } |
| } |
| |
| impl Hash for Custom { |
| fn hash<H: Hasher>(&self, state: &mut H) { |
| state.write_u64(self.hash); |
| } |
| } |
| |
| #[test] |
| fn test_custom_state() { |
| fn hash<T: Hash>(t: &T) -> u64 { |
| let mut c = CustomHasher { output: 0 }; |
| t.hash(&mut c); |
| c.finish() |
| } |
| |
| assert_eq!(hash(&Custom { hash: 5 }), 5); |
| } |
| |
| // FIXME: Instantiated functions with i128 in the signature is not supported in Emscripten. |
| // See https://github.com/kripken/emscripten-fastcomp/issues/169 |
| #[cfg(not(target_os = "emscripten"))] |
| #[test] |
| fn test_indirect_hasher() { |
| let mut hasher = MyHasher { hash: 0 }; |
| { |
| let mut indirect_hasher: &mut dyn Hasher = &mut hasher; |
| 5u32.hash(&mut indirect_hasher); |
| } |
| assert_eq!(hasher.hash, 5); |
| } |