1 use crate::lock::{RwLockReadGuard, RwLockWriteGuard};
2 use crate::HashMap;
3 use core::hash::BuildHasher;
4 use core::hash::Hash;
5 use core::ops::{Deref, DerefMut};
6 use std::collections::hash_map::RandomState;
7 use std::sync::Arc;
8 
9 pub struct RefMulti<'a, K, V, S = RandomState> {
10     _guard: Arc<RwLockReadGuard<'a, HashMap<K, V, S>>>,
11     k: *const K,
12     v: *const V,
13 }
14 
15 unsafe impl<'a, K: Eq + Hash + Sync, V: Sync, S: BuildHasher> Send for RefMulti<'a, K, V, S> {}
16 unsafe impl<'a, K: Eq + Hash + Sync, V: Sync, S: BuildHasher> Sync for RefMulti<'a, K, V, S> {}
17 
18 impl<'a, K: Eq + Hash, V, S: BuildHasher> RefMulti<'a, K, V, S> {
new( guard: Arc<RwLockReadGuard<'a, HashMap<K, V, S>>>, k: *const K, v: *const V, ) -> Self19     pub(crate) unsafe fn new(
20         guard: Arc<RwLockReadGuard<'a, HashMap<K, V, S>>>,
21         k: *const K,
22         v: *const V,
23     ) -> Self {
24         Self {
25             _guard: guard,
26             k,
27             v,
28         }
29     }
30 
key(&self) -> &K31     pub fn key(&self) -> &K {
32         self.pair().0
33     }
34 
value(&self) -> &V35     pub fn value(&self) -> &V {
36         self.pair().1
37     }
38 
pair(&self) -> (&K, &V)39     pub fn pair(&self) -> (&K, &V) {
40         unsafe { (&*self.k, &*self.v) }
41     }
42 }
43 
44 impl<'a, K: Eq + Hash, V, S: BuildHasher> Deref for RefMulti<'a, K, V, S> {
45     type Target = V;
46 
deref(&self) -> &V47     fn deref(&self) -> &V {
48         self.value()
49     }
50 }
51 
52 pub struct RefMutMulti<'a, K, V, S = RandomState> {
53     _guard: Arc<RwLockWriteGuard<'a, HashMap<K, V, S>>>,
54     k: *const K,
55     v: *mut V,
56 }
57 
58 unsafe impl<'a, K: Eq + Hash + Sync, V: Sync, S: BuildHasher> Send for RefMutMulti<'a, K, V, S> {}
59 unsafe impl<'a, K: Eq + Hash + Sync, V: Sync, S: BuildHasher> Sync for RefMutMulti<'a, K, V, S> {}
60 
61 impl<'a, K: Eq + Hash, V, S: BuildHasher> RefMutMulti<'a, K, V, S> {
new( guard: Arc<RwLockWriteGuard<'a, HashMap<K, V, S>>>, k: *const K, v: *mut V, ) -> Self62     pub(crate) unsafe fn new(
63         guard: Arc<RwLockWriteGuard<'a, HashMap<K, V, S>>>,
64         k: *const K,
65         v: *mut V,
66     ) -> Self {
67         Self {
68             _guard: guard,
69             k,
70             v,
71         }
72     }
73 
key(&self) -> &K74     pub fn key(&self) -> &K {
75         self.pair().0
76     }
77 
value(&self) -> &V78     pub fn value(&self) -> &V {
79         self.pair().1
80     }
81 
value_mut(&mut self) -> &mut V82     pub fn value_mut(&mut self) -> &mut V {
83         self.pair_mut().1
84     }
85 
pair(&self) -> (&K, &V)86     pub fn pair(&self) -> (&K, &V) {
87         unsafe { (&*self.k, &*self.v) }
88     }
89 
pair_mut(&mut self) -> (&K, &mut V)90     pub fn pair_mut(&mut self) -> (&K, &mut V) {
91         unsafe { (&*self.k, &mut *self.v) }
92     }
93 }
94 
95 impl<'a, K: Eq + Hash, V, S: BuildHasher> Deref for RefMutMulti<'a, K, V, S> {
96     type Target = V;
97 
deref(&self) -> &V98     fn deref(&self) -> &V {
99         self.value()
100     }
101 }
102 
103 impl<'a, K: Eq + Hash, V, S: BuildHasher> DerefMut for RefMutMulti<'a, K, V, S> {
deref_mut(&mut self) -> &mut V104     fn deref_mut(&mut self) -> &mut V {
105         self.value_mut()
106     }
107 }
108