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
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
mod key;
pub use self::key::BytesKey;
use std::hash::Hasher;
use std::{mem, slice};
pub trait Hash {
fn hash<H: Hasher>(&self, state: &mut H);
fn hash_slice<H: Hasher>(data: &[Self], state: &mut H)
where
Self: Sized,
{
for piece in data {
piece.hash(state);
}
}
}
macro_rules! impl_write {
($(($ty:ident, $meth:ident),)*) => {$(
impl Hash for $ty {
fn hash<H: Hasher>(&self, state: &mut H) {
state.$meth(*self)
}
fn hash_slice<H: Hasher>(data: &[$ty], state: &mut H) {
let newlen = data.len() * mem::size_of::<$ty>();
let ptr = data.as_ptr() as *const u8;
state.write(unsafe { slice::from_raw_parts(ptr, newlen) })
}
}
)*}
}
impl_write! {
(u8, write_u8),
(u16, write_u16),
(u32, write_u32),
(u64, write_u64),
(usize, write_usize),
(i8, write_i8),
(i16, write_i16),
(i32, write_i32),
(i64, write_i64),
(isize, write_isize),
(u128, write_u128),
(i128, write_i128),
}
impl Hash for bool {
fn hash<H: Hasher>(&self, state: &mut H) {
state.write_u8(*self as u8)
}
}
impl Hash for char {
fn hash<H: Hasher>(&self, state: &mut H) {
state.write_u32(*self as u32)
}
}
impl Hash for str {
fn hash<H: Hasher>(&self, state: &mut H) {
state.write(self.as_bytes());
}
}
impl Hash for String {
fn hash<H: Hasher>(&self, state: &mut H) {
state.write(self.as_bytes());
}
}
macro_rules! impl_hash_tuple {
() => (
impl Hash for () {
fn hash<H: Hasher>(&self, _state: &mut H) {}
}
);
( $($name:ident)+) => (
impl<$($name: Hash),*> Hash for ($($name,)*) where last_type!($($name,)+): ?Sized {
#[allow(non_snake_case)]
fn hash<S: Hasher>(&self, state: &mut S) {
let ($(ref $name,)*) = *self;
$($name.hash(state);)*
}
}
);
}
macro_rules! last_type {
($a:ident,) => { $a };
($a:ident, $($rest_a:ident,)+) => { last_type!($($rest_a,)+) };
}
impl_hash_tuple! {}
impl_hash_tuple! { A }
impl_hash_tuple! { A B }
impl_hash_tuple! { A B C }
impl_hash_tuple! { A B C D }
impl_hash_tuple! { A B C D E }
impl_hash_tuple! { A B C D E F }
impl_hash_tuple! { A B C D E F G }
impl_hash_tuple! { A B C D E F G H }
impl_hash_tuple! { A B C D E F G H I }
impl_hash_tuple! { A B C D E F G H I J }
impl_hash_tuple! { A B C D E F G H I J K }
impl_hash_tuple! { A B C D E F G H I J K L }
impl<T: Hash> Hash for [T] {
fn hash<H: Hasher>(&self, state: &mut H) {
Hash::hash_slice(self, state)
}
}
impl<T: Hash> Hash for Vec<T> {
fn hash<H: Hasher>(&self, state: &mut H) {
Hash::hash_slice(self, state)
}
}
impl<T: ?Sized + Hash> Hash for &T {
fn hash<H: Hasher>(&self, state: &mut H) {
(**self).hash(state);
}
}
impl<T: ?Sized + Hash> Hash for &mut T {
fn hash<H: Hasher>(&self, state: &mut H) {
(**self).hash(state);
}
}
impl<T: ?Sized> Hash for *const T {
fn hash<H: Hasher>(&self, state: &mut H) {
if mem::size_of::<Self>() == mem::size_of::<usize>() {
state.write_usize(*self as *const () as usize);
} else {
let (a, b) = unsafe { *(self as *const Self as *const (usize, usize)) };
state.write_usize(a);
state.write_usize(b);
}
}
}
impl<T: ?Sized> Hash for *mut T {
fn hash<H: Hasher>(&self, state: &mut H) {
if mem::size_of::<Self>() == mem::size_of::<usize>() {
state.write_usize(*self as *const () as usize);
} else {
let (a, b) = unsafe { *(self as *const Self as *const (usize, usize)) };
state.write_usize(a);
state.write_usize(b);
}
}
}