cev 0.1.0

An expandable data array used to add data to the beginning of the array.
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

use cev::Cev;
use std::ptr::NonNull;

#[test]
fn test_truncate_ptr() {
    let mut cev: Cev<u8> = Cev::new();
    cev.truncate(0);
    assert_eq!(cev.len(), 0);
    assert_eq!(cev.as_ptr(), NonNull::<u8>::dangling().as_ptr());
    assert_eq!(cev, []);

    let mut cev: Cev<u8> = Cev::with_capacity(0);
    cev.truncate(0);
    assert_eq!(cev.len(), 0);
    assert_eq!(cev.as_ptr(), NonNull::<u8>::dangling().as_ptr());
    assert_eq!(cev, []);

    let mut cev: Cev<u8> = Cev::with_capacity(1);
    cev.truncate(0);
    assert_eq!(cev.len(), 0);
    assert_eq!( unsafe { cev.as_ptr().offset_from(cev.raw_ptr()) }, (cev.capacity() - cev.len() - 1) as isize);
    assert_eq!(cev, []);

    let mut cev: Cev<u8> = Cev::new();
    cev.reserve(1);
    cev.truncate(0);
    assert_eq!(cev.len(), 0);
    assert_eq!(unsafe { cev.as_ptr().offset_from(cev.raw_ptr()) }, (cev.capacity() - cev.len() - 1) as isize);
    assert_eq!(cev, []);

    let mut cev: Cev<u8> = Cev::from([5, 4, 3, 2, 1]);
    cev.truncate(3);
    assert_eq!(cev.len(), 3);
    assert_eq!(unsafe { cev.as_ptr().offset_from(cev.raw_ptr()) }, (cev.capacity() - cev.len()) as isize);
    assert_eq!(cev, [3, 2, 1]);

    let mut cev: Cev<u8> = Cev::from([5, 4, 3, 2, 1]);
    cev.truncate(5);
    assert_eq!(cev.len(), 5);
    assert_eq!(unsafe { cev.as_ptr().offset_from(cev.raw_ptr()) }, 0);
    assert_eq!(cev, [5, 4, 3, 2, 1]);

    let mut cev: Cev<u8> = Cev::from([5, 4, 3, 2, 1]);
    cev.truncate(10);
    assert_eq!(cev.len(), 5);
    assert_eq!(unsafe { cev.as_ptr().offset_from(cev.raw_ptr()) }, 0);
    assert_eq!(cev, [5, 4, 3, 2, 1]);

    let mut cev: Cev<u8> = Cev::from([5, 4, 3, 2, 1]);
    let cap = cev.capacity();
    assert_eq!(cap, 5);
    cev.truncate(0);
    assert_eq!(cev.capacity(), cap);
    assert_eq!(cev.len(), 0);
    assert_eq!(unsafe { cev.as_ptr().offset_from(cev.raw_ptr()) }, (cev.capacity() - 1) as isize);
    assert_eq!(cev, []);

    let mut cev: Cev<()> = Cev::new();
    cev.truncate(0);
    assert_eq!(cev.len(), 0);
    assert_eq!(cev.as_ptr(), NonNull::<()>::dangling().as_ptr());
    assert_eq!(cev, []);

    let mut cev: Cev<()> = Cev::with_capacity(0);
    cev.truncate(0);
    assert_eq!(cev.len(), 0);
    assert_eq!(cev.as_ptr(), NonNull::<()>::dangling().as_ptr());
    assert_eq!(cev, []);

    let mut cev: Cev<()> = Cev::with_capacity(1);
    cev.truncate(0);
    assert_eq!(cev.len(), 0);
    assert_eq!(cev.as_ptr(), NonNull::<()>::dangling().as_ptr());
    assert_eq!(cev, []);

    let mut cev: Cev<()> = Cev::with_capacity(10);
    cev.truncate(0);
    assert_eq!(cev.len(), 0);
    assert_eq!(cev.as_ptr(), NonNull::<()>::dangling().as_ptr());
    assert_eq!(cev, []);

    let mut cev: Cev<()> = Cev::from([(), (), (), (), ()]);
    let cap = cev.capacity();
    cev.truncate(0);
    assert_eq!(cev.capacity(), cap);
    assert_eq!(cev.len(), 0);
    assert_eq!(cev.as_ptr(), NonNull::<()>::dangling().as_ptr());
    assert_eq!(cev, []);

    let mut cev: Cev<()> = Cev::from([(), (), (), (), ()]);
    let cap = cev.capacity();
    cev.truncate(1);
    assert_eq!(cev.capacity(), cap);
    assert_eq!(cev.len(), 1);
    assert_eq!(cev.as_ptr(), NonNull::<()>::dangling().as_ptr());
    assert_eq!(cev, [()]);
}