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
use std::borrow::Borrow;
use std::collections::HashMap;
use std::hash::Hash;
use stable_deref_trait::StableDeref;
use std::sync::RwLock;
pub struct FrozenMap<K, V> {
map: RwLock<HashMap<K, V>>
}
impl<K: Eq + Hash, V: StableDeref> FrozenMap<K, V> {
pub fn new() -> Self {
Self {
map: RwLock::new(Default::default()),
}
}
pub fn insert(&self, k: K, v: V) -> &V::Target {
let mut map = self.map.write().unwrap();
let ret = unsafe {
let inserted = &**map.entry(k).or_insert(v);
&* (inserted as *const _)
};
ret
}
pub fn get<Q: ?Sized>(&self, k: &Q) -> Option<&V::Target>
where
K: Borrow<Q>,
Q: Hash + Eq,
{
let map = self.map.read().unwrap();
let ret = unsafe {
map.get(k).map(|x| &*(&**x as *const V::Target))
};
ret
}
}
pub struct FrozenVec<T> {
vec: RwLock<Vec<T>>,
}
impl<T: StableDeref> FrozenVec<T> {
pub fn new() -> Self {
Self {
vec: RwLock::new(Default::default()),
}
}
pub fn push(&self, val: T) {
let mut vec = self.vec.write().unwrap();
vec.push(val);
}
pub fn push_get(&self, val: T) -> &T::Target {
let mut vec = self.vec.write().unwrap();
vec.push(val);
unsafe {
&*(&**vec.get_unchecked(vec.len() - 1) as *const T::Target)
}
}
pub fn get(&self, index: usize) -> Option<&T::Target> {
let vec = self.vec.read().unwrap();
unsafe {
vec.get(index).map(|x| &*(&**x as *const T::Target))
}
}
}