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
167
168
169
170
171
172
173

extern crate smallvec;

pub mod bucket;
pub mod hash;
pub mod kv;

use std::marker::PhantomData;

pub use bucket::{ArrayBucket, ArrayBucketList, Bucket, BucketList, SmallVecBucket,
                 SmallVecBucketList};
pub use hash::{DefaultHasher, Hash, Hasher};
pub use kv::{Key, Value};

pub struct PrimitiveMap<
    K: Key,
    V: Value,
    B: Bucket<K, V>,
    BL: BucketList<K, V, Bucket = B>,
    H: Hasher<K>,
> {
    buckets: BL,
    _marker: PhantomData<(K, V, B, H)>,
}

impl<K, V, B, BL, H> PrimitiveMap<K, V, B, BL, H>
where
    K: Key,
    V: Value,
    B: Bucket<K, V>,
    BL: BucketList<K, V, Bucket = B>,
    H: Hasher<K>,
{
    pub fn custom(buckets: BL, _hasher: H) -> Self {
        PrimitiveMap {
            buckets,
            _marker: PhantomData,
        }
    }

    pub fn insert(&mut self, key: K, value: V) {
        let addr = self.get_addr(key);
        let bucket = self.buckets.get_mut(addr);
        bucket.push(key, value)
    }

    pub fn get(&self, key: K) -> Option<V> {
        let addr = self.get_addr(key);
        let bucket = &self.buckets.get(addr);
        bucket.get(key)
    }

    fn get_addr(&self, key: K) -> usize {
        let hash = H::hash(key);
        H::compress(hash, self.buckets.len())
    }
}

impl<K, V> PrimitiveMap<K, V, SmallVecBucket<K, V>, SmallVecBucketList<K, V>, DefaultHasher<K>>
where
    K: Key,
    V: Value,
    DefaultHasher<K>: Hasher<K>,
{
    pub fn dynamic() -> Self {
        PrimitiveMap::custom(SmallVecBucketList::empty(), DefaultHasher::default())
    }
}

impl<K, V> PrimitiveMap<K, V, ArrayBucket<K, V>, ArrayBucketList<K, V>, DefaultHasher<K>>
where
    K: Key,
    V: Value,
    DefaultHasher<K>: Hasher<K>,
{
    pub fn fixed() -> Self {
        PrimitiveMap::custom(ArrayBucketList::empty(), DefaultHasher::default())
    }
}

impl<K, V, H> PrimitiveMap<K, V, SmallVecBucket<K, V>, SmallVecBucketList<K, V>, H>
where
    K: Key,
    V: Value,
    H: Hasher<K>,
{
    pub fn dynamic_with_hasher(hasher: H) -> Self {
        PrimitiveMap::custom(SmallVecBucketList::empty(), hasher)
    }
}

impl<K, V, H> PrimitiveMap<K, V, ArrayBucket<K, V>, ArrayBucketList<K, V>, H>
where
    K: Key,
    V: Value,
    H: Hasher<K>,
{
    pub fn fixed_with_hasher(hasher: H) -> Self {
        PrimitiveMap::custom(ArrayBucketList::empty(), hasher)
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn create_dynamic() {
        <PrimitiveMap<u8, u32, _, _, _>>::dynamic();
    }

    #[test]
    fn create_fixed() {
        <PrimitiveMap<u8, u32, _, _, _>>::fixed();
    }

    #[test]
    fn default_hasher() {
        <PrimitiveMap<u8, u8, _, _, _>>::dynamic();
        <PrimitiveMap<u16, u8, _, _, _>>::dynamic();
        <PrimitiveMap<u32, u8, _, _, _>>::dynamic();
        <PrimitiveMap<u64, u8, _, _, _>>::dynamic();
        <PrimitiveMap<usize, u8, _, _, _>>::dynamic();
        <PrimitiveMap<i8, u8, _, _, _>>::dynamic();
        <PrimitiveMap<i16, u8, _, _, _>>::dynamic();
        <PrimitiveMap<i32, u8, _, _, _>>::dynamic();
    }

    #[test]
    fn insert_dynamic() {
        let mut map = PrimitiveMap::dynamic();
        map.insert(0u8, 10u32);
    }

    #[test]
    fn insert_fixed() {
        let mut map: PrimitiveMap<_, _, _, _, DefaultHasher<_>> = PrimitiveMap::fixed();
        map.insert(0u16, 10u32);
    }

    #[test]
    fn get_empty_dynamic() {
        let map = PrimitiveMap::dynamic();
        assert_eq!(map.get(0u32), None::<u32>);
    }

    #[test]
    fn get_empty_fixed() {
        let map = PrimitiveMap::fixed();
        assert_eq!(map.get(0u32), None::<u32>);
    }

    #[test]
    fn insert_and_get_dynamic() {
        let mut map = PrimitiveMap::dynamic();
        map.insert(0i8, 10u32);
        assert_eq!(map.get(0i8), Some(10u32));
    }

    #[test]
    fn insert_and_get_fixed() {
        let mut map = PrimitiveMap::fixed();
        map.insert(0i16, 10u32);
        assert_eq!(map.get(0i16), Some(10u32));
    }

    #[test]
    fn insert_saturate_buckets_dynamic() {
        let mut map = PrimitiveMap::dynamic();
        for i in 0..10000 {
            map.insert(i, 10u32);
        }
    }
}