arctic-wt 0.1.5

Lock-free adaptive radix tree
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
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

use core::ops::Add;
use core::ops::AddAssign;
use core::ops::Sub;
use core::ops::SubAssign;

use ribbit::u6;
use ribbit::u13;

/// Key length.
pub(crate) trait Len:
    Sized
    + Copy
    + AddAssign
    + Add<Output = Self>
    + SubAssign
    + Sub<Output = Self>
    + PartialOrd
    + core::fmt::Debug
{
    /// Length of an empty key.
    const ZERO: Self;

    /// Length of a key with a single byte.
    const BYTE: Self;

    /// Return the key length in bits.
    fn bits(self) -> usize;

    /// Return the key length in bytes.
    fn bytes(self) -> usize;
}

#[doc(hidden)]
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord)]
pub struct Byte(pub(super) usize);

impl Len for Byte {
    const ZERO: Self = Self(0);
    const BYTE: Self = Self(1);

    #[inline]
    fn bits(self) -> usize {
        self.0 << 3
    }

    #[inline]
    fn bytes(self) -> usize {
        self.0
    }
}

impl From<u6> for Byte {
    #[inline]
    fn from(len: u6) -> Self {
        Self((len.value() >> 3) as usize)
    }
}

impl From<u13> for Byte {
    #[inline]
    fn from(len: u13) -> Self {
        Self(len.value() as usize)
    }
}

impl From<Byte> for u6 {
    #[inline]
    fn from(len: Byte) -> Self {
        u6::extract_u64((len.0 << 3) as u64, 0)
    }
}

impl From<Byte> for u13 {
    #[inline]
    fn from(len: Byte) -> Self {
        u13::extract_u64(len.0 as u64, 0)
    }
}

impl Add for Byte {
    type Output = Self;
    #[inline]
    fn add(self, rhs: Self) -> Self::Output {
        Self(self.0 + rhs.0)
    }
}

impl AddAssign for Byte {
    #[inline]
    fn add_assign(&mut self, rhs: Self) {
        self.0 += rhs.0;
    }
}

impl Sub for Byte {
    type Output = Self;
    #[inline]
    fn sub(self, rhs: Self) -> Self::Output {
        Self(self.0 - rhs.0)
    }
}

impl SubAssign for Byte {
    #[inline]
    fn sub_assign(&mut self, rhs: Self) {
        self.0 -= rhs.0;
    }
}

#[doc(hidden)]
#[derive(Copy, Clone, Debug, Default, PartialEq, Eq, PartialOrd, Ord)]
pub struct Bit(pub(super) u8);

impl From<u6> for Bit {
    #[inline]
    fn from(len: u6) -> Self {
        Self(len.value())
    }
}

impl From<Bit> for u6 {
    #[inline]
    fn from(len: Bit) -> Self {
        const MASK: u8 = 0b0011_1000;
        unsafe { u6::new_unchecked(len.0 & MASK) }
    }
}

impl Len for Bit {
    const ZERO: Self = Self(0);
    const BYTE: Self = Self(8);

    #[inline]
    fn bits(self) -> usize {
        self.0 as usize
    }

    #[inline]
    fn bytes(self) -> usize {
        (self.0 >> 3) as usize
    }
}

impl Add for Bit {
    type Output = Self;
    #[inline]
    fn add(self, rhs: Self) -> Self::Output {
        Self(self.0 + rhs.0)
    }
}

impl AddAssign for Bit {
    #[inline]
    fn add_assign(&mut self, rhs: Self) {
        self.0 += rhs.0;
    }
}

impl Sub for Bit {
    type Output = Self;
    #[inline]
    fn sub(self, rhs: Self) -> Self::Output {
        Self(self.0 - rhs.0)
    }
}

impl SubAssign for Bit {
    #[inline]
    fn sub_assign(&mut self, rhs: Self) {
        self.0 -= rhs.0;
    }
}