1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
//! A none hashing [`Hasher`] implementation.
use std::{
hash::{BuildHasher, Hasher},
marker::PhantomData,
};
pub type NoHashHashMap<K, V> = std::collections::HashMap<K, V, NoHashHasherBuilder<K>>;
pub type NoHashHashSet<K> = std::collections::HashSet<K, NoHashHasherBuilder<K>>;
#[derive(Copy, Clone, Debug, PartialEq, Eq)]
pub struct NoHashHasherBuilder<T>(PhantomData<T>);
impl<T> Default for NoHashHasherBuilder<T> {
fn default() -> Self {
Self(Default::default())
}
}
pub trait NoHashHashable {}
impl NoHashHashable for usize {}
impl NoHashHashable for u32 {}
pub struct NoHashHasher(u64);
impl<T: NoHashHashable> BuildHasher for NoHashHasherBuilder<T> {
type Hasher = NoHashHasher;
fn build_hasher(&self) -> Self::Hasher {
NoHashHasher(0)
}
}
impl Hasher for NoHashHasher {
fn finish(&self) -> u64 {
self.0
}
fn write(&mut self, _: &[u8]) {
unimplemented!("NoHashHasher should only be used for hashing primitive integers")
}
fn write_u8(&mut self, i: u8) {
self.0 = i as u64;
}
fn write_u16(&mut self, i: u16) {
self.0 = i as u64;
}
fn write_u32(&mut self, i: u32) {
self.0 = i as u64;
}
fn write_u64(&mut self, i: u64) {
self.0 = i as u64;
}
fn write_usize(&mut self, i: usize) {
self.0 = i as u64;
}
fn write_i8(&mut self, i: i8) {
self.0 = i as u64;
}
fn write_i16(&mut self, i: i16) {
self.0 = i as u64;
}
fn write_i32(&mut self, i: i32) {
self.0 = i as u64;
}
fn write_i64(&mut self, i: i64) {
self.0 = i as u64;
}
fn write_isize(&mut self, i: isize) {
self.0 = i as u64;
}
}
|
