arenavec 0.1.1

An arena backed implementation of vectors and related types.
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

use arenavec::rc::{Arena, SliceVec};
use arenavec::ArenaBacking;

const DEFAULT_CAPACITY: usize = 4096 << 16;

#[test]
fn init_empty() {
    if cfg!(not(miri)) {
        let arena = Arena::init_capacity(ArenaBacking::MemoryMap, DEFAULT_CAPACITY).unwrap();

        let vec: SliceVec<usize> = SliceVec::new(arena.inner());

        assert_eq!(vec.len(), 0);
        assert_eq!(vec.capacity(), 0);
    }

    {
        let arena = Arena::init_capacity(ArenaBacking::SystemAllocation, DEFAULT_CAPACITY).unwrap();

        let vec: SliceVec<usize> = SliceVec::new(arena.inner());

        assert_eq!(vec.len(), 0);
        assert_eq!(vec.capacity(), 0);
    }
}

#[test]
fn init_capacity() {
    let arena = Arena::init_capacity(ArenaBacking::SystemAllocation, DEFAULT_CAPACITY).unwrap();

    let mut vec = SliceVec::with_capacity(arena.inner(), 10);

    assert_eq!(vec.len(), 0);
    assert_eq!(vec.capacity(), 10);

    for i in 0..10 {
        vec.push(i);
    }

    assert_eq!(vec.len(), 10);
    assert_eq!(vec.capacity(), 10);
}

#[test]
fn init_empty_push() {
    let arena = Arena::init_capacity(ArenaBacking::SystemAllocation, DEFAULT_CAPACITY).unwrap();

    let mut vec = SliceVec::new(arena.inner());

    assert_eq!(vec.len(), 0);
    assert_eq!(vec.capacity(), 0);

    vec.push(1);

    assert_eq!(vec.len(), 1);
    assert_eq!(vec.capacity(), 4);

    vec.push(2);
    vec.push(3);
    vec.push(4);

    assert_eq!(vec.len(), 4);
    assert_eq!(vec.capacity(), 4);

    vec.push(5);

    assert_eq!(vec.len(), 5);
    assert_eq!(vec.capacity(), 8);
}

#[test]
fn reserve_and_resize() {
    let arena = Arena::init_capacity(ArenaBacking::SystemAllocation, DEFAULT_CAPACITY).unwrap();

    let mut vec = SliceVec::new(arena.inner());

    assert_eq!(vec.len(), 0);
    assert_eq!(vec.capacity(), 0);

    for i in 0..5 {
        vec.push(i);
    }

    assert_eq!(vec.len(), 5);
    assert_eq!(vec.capacity(), 8);

    vec.reserve(2);

    assert_eq!(vec.capacity(), 8);

    vec.reserve(9);

    assert_eq!(vec.capacity(), 16);

    vec.resize(12, 1);

    assert_eq!(vec.len(), 12);
    assert_eq!(vec.capacity(), 16);

    for i in 5..12 {
        assert_eq!(vec[i], 1);
    }
}

#[test]
fn drop() {
    use std::rc::Rc;

    let rc = Rc::new(());
    let arena = Arena::init_capacity(ArenaBacking::SystemAllocation, DEFAULT_CAPACITY).unwrap();

    {
        let mut vec = SliceVec::with_capacity(arena.inner(), 15);

        for _ in 0..20 {
            vec.push(rc.clone());
        }

        vec.resize(10, Rc::new(()));
    }

    assert_eq!(Rc::strong_count(&rc), 1);
}