rkyv/impls/hashbrown/
hash_map.rs

1use crate::{
2    collections::hash_map::{ArchivedHashMap, HashMapResolver},
3    ser::{ScratchSpace, Serializer},
4    Archive, Deserialize, Fallible, Serialize,
5};
6use core::{
7    borrow::Borrow,
8    hash::{BuildHasher, Hash},
9};
10use hashbrown::HashMap;
11
12impl<K: Archive + Hash + Eq, V: Archive, S> Archive for HashMap<K, V, S>
13where
14    K::Archived: Hash + Eq,
15{
16    type Archived = ArchivedHashMap<K::Archived, V::Archived>;
17    type Resolver = HashMapResolver;
18
19    #[inline]
20    unsafe fn resolve(&self, pos: usize, resolver: Self::Resolver, out: *mut Self::Archived) {
21        ArchivedHashMap::resolve_from_len(self.len(), pos, resolver, out);
22    }
23}
24
25impl<K, V, S, RandomState> Serialize<S> for HashMap<K, V, RandomState>
26where
27    K: Serialize<S> + Hash + Eq,
28    K::Archived: Hash + Eq,
29    V: Serialize<S>,
30    S: Serializer + ScratchSpace + ?Sized,
31{
32    #[inline]
33    fn serialize(&self, serializer: &mut S) -> Result<Self::Resolver, S::Error> {
34        unsafe { ArchivedHashMap::serialize_from_iter(self.iter(), serializer) }
35    }
36}
37
38impl<K: Archive + Hash + Eq, V: Archive, D: Fallible + ?Sized, S: Default + BuildHasher>
39    Deserialize<HashMap<K, V, S>, D> for ArchivedHashMap<K::Archived, V::Archived>
40where
41    K::Archived: Deserialize<K, D> + Hash + Eq,
42    V::Archived: Deserialize<V, D>,
43{
44    #[inline]
45    fn deserialize(&self, deserializer: &mut D) -> Result<HashMap<K, V, S>, D::Error> {
46        let mut result = HashMap::with_capacity_and_hasher(self.len(), S::default());
47        for (k, v) in self.iter() {
48            result.insert(k.deserialize(deserializer)?, v.deserialize(deserializer)?);
49        }
50        Ok(result)
51    }
52}
53
54impl<K: Hash + Eq + Borrow<AK>, V, AK: Hash + Eq, AV: PartialEq<V>, S: BuildHasher>
55    PartialEq<HashMap<K, V, S>> for ArchivedHashMap<AK, AV>
56{
57    #[inline]
58    fn eq(&self, other: &HashMap<K, V, S>) -> bool {
59        if self.len() != other.len() {
60            false
61        } else {
62            self.iter()
63                .all(|(key, value)| other.get(key).map_or(false, |v| value.eq(v)))
64        }
65    }
66}
67
68impl<K: Hash + Eq + Borrow<AK>, V, AK: Hash + Eq, AV: PartialEq<V>>
69    PartialEq<ArchivedHashMap<AK, AV>> for HashMap<K, V>
70{
71    #[inline]
72    fn eq(&self, other: &ArchivedHashMap<AK, AV>) -> bool {
73        other.eq(self)
74    }
75}
76
77#[cfg(test)]
78mod tests {
79    use crate::{
80        archived_root,
81        ser::{serializers::AllocSerializer, Serializer},
82        Deserialize, Infallible,
83    };
84    #[cfg(all(feature = "alloc", not(feature = "std")))]
85    use alloc::string::String;
86    use hashbrown::HashMap;
87
88    #[test]
89    fn index_map() {
90        let mut value = HashMap::new();
91        value.insert(String::from("foo"), 10);
92        value.insert(String::from("bar"), 20);
93        value.insert(String::from("baz"), 40);
94        value.insert(String::from("bat"), 80);
95
96        let mut serializer = AllocSerializer::<4096>::default();
97        serializer.serialize_value(&value).unwrap();
98        let result = serializer.into_serializer().into_inner();
99        let archived = unsafe { archived_root::<HashMap<String, i32>>(result.as_ref()) };
100
101        assert_eq!(value.len(), archived.len());
102        for (k, v) in value.iter() {
103            let (ak, av) = archived.get_key_value(k.as_str()).unwrap();
104            assert_eq!(k, ak);
105            assert_eq!(v, av);
106        }
107
108        let deserialized: HashMap<String, i32> = archived.deserialize(&mut Infallible).unwrap();
109        assert_eq!(value, deserialized);
110    }
111
112    #[cfg(feature = "validation")]
113    #[test]
114    fn validate_index_map() {
115        use crate::check_archived_root;
116
117        let mut value = HashMap::new();
118        value.insert(String::from("foo"), 10);
119        value.insert(String::from("bar"), 20);
120        value.insert(String::from("baz"), 40);
121        value.insert(String::from("bat"), 80);
122
123        let mut serializer = AllocSerializer::<4096>::default();
124        serializer.serialize_value(&value).unwrap();
125        let result = serializer.into_serializer().into_inner();
126        check_archived_root::<HashMap<String, i32>>(result.as_ref())
127            .expect("failed to validate archived index map");
128    }
129}
rkyv/impls/hashbrown/hash_map.rs

rkyv/impls/hashbrown/
hash_map.rs
