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