edict 1.0.0-rc9

Powerful entity-component-system library
Documentation 
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

use core::hash::{BuildHasher, Hasher};

#[derive(Default)]
pub struct NoOpHasher {
    value: u64,
}

impl NoOpHasher {
    pub fn new() -> Self {
        NoOpHasher { value: 0 }
    }
}

impl Hasher for NoOpHasher {
    #[inline]
    fn write(&mut self, bytes: &[u8]) {
        let mut b = [0; 8];
        let c = 8.min(bytes.len());
        b[..c].copy_from_slice(&bytes[..c]);
        self.value = u64::from_ne_bytes(b);
    }

    #[inline]
    fn write_u64(&mut self, i: u64) {
        self.value = i;
    }

    #[inline]
    fn write_u128(&mut self, i: u128) {
        self.value = i as u64;
    }

    #[inline]
    fn write_usize(&mut self, i: usize) {
        self.value = i as u64;
    }

    #[inline]
    fn finish(&self) -> u64 {
        self.value
    }
}

#[derive(Default)]
pub struct NoOpHasherBuilder;

impl BuildHasher for NoOpHasherBuilder {
    type Hasher = NoOpHasher;

    #[inline]
    fn build_hasher(&self) -> NoOpHasher {
        NoOpHasher::new()
    }
}

const MUL_HASH_CONST_64: u64 = 11400714819323198485;

pub struct MulHasher {
    value: u64,
}

impl MulHasher {
    #[inline]
    pub fn new() -> Self {
        MulHasher { value: 0 }
    }
}

impl Hasher for MulHasher {
    #[inline]
    fn write(&mut self, bytes: &[u8]) {
        for chunk in bytes.chunks(8) {
            let mut b = [0; 8];
            b[..chunk.len()].copy_from_slice(chunk);
            self.value ^= u64::from_ne_bytes(b);
        }
    }

    #[inline]
    fn write_u64(&mut self, i: u64) {
        self.value = self.value.wrapping_mul(MUL_HASH_CONST_64).wrapping_add(i);
    }

    #[inline]
    fn write_u128(&mut self, i: u128) {
        self.write_u64(i as u64);
        self.write_u64((i >> 64) as u64);
    }

    #[inline]
    fn write_usize(&mut self, i: usize) {
        self.write_u64(i as u64);
    }

    #[inline]
    fn finish(&self) -> u64 {
        // Most significant bits are better than leas significant ones.
        self.value.wrapping_mul(MUL_HASH_CONST_64).swap_bytes()
    }
}

pub struct MulHasherBuilder;

impl BuildHasher for MulHasherBuilder {
    type Hasher = MulHasher;

    fn build_hasher(&self) -> MulHasher {
        MulHasher::new()
    }
}