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

use crate::DigitSequence;

/// Consuming iteration on [DigitSequence] is supported:
///
/// ```
/// use digit_sequence::*;
///
/// # fn main() -> GenericResult<()> {
/// let source = [9, 5, 0, 2];
/// let sequence: DigitSequence = (&source).try_into()?;
/// let mut target: Vec<u8> = vec![];
///
/// for digit in sequence {
///     target.push(digit)
/// }
///
/// assert_eq!(target, source);
///
/// # Ok(())
/// # }
/// ```
///
/// In this case, the sequence cannot be reused once consumed:
///
/// ```compile_fail
/// use digit_sequence::*;
///
/// # fn main() -> GenericResult<()> {
/// let source = [9, 5, 0, 2];
/// let sequence: DigitSequence = (&source).try_into()?;
///
/// for digit in sequence {
///     //Just do something
/// }
///
/// for digit in sequence {
///     //Could never arrive here
/// }
///
/// # Ok(())
/// # }
/// ```
impl IntoIterator for DigitSequence {
    type Item = u8;

    type IntoIter = std::vec::IntoIter<Self::Item>;

    fn into_iter(self) -> Self::IntoIter {
        self.0.into_iter()
    }
}

/// Repeatable, reference-based iteration on &[DigitSequence] is supported.
///
/// ```
/// use digit_sequence::*;
///
/// # fn main() -> GenericResult<()> {
/// let source = [9, 5, 0, 2];
/// let sequence: DigitSequence = (&source).try_into()?;
/// let mut target: Vec<u8> = vec![];
///
/// for digit in &sequence {
///     target.push(*digit)
/// }
///
/// for digit in &sequence {
///     target.push(*digit)
/// }
///
/// let expected_vec: Vec<u8> = [&source[..], &source[..]].concat();
///
/// assert_eq!(target, expected_vec);
///
/// # Ok(())
/// # }
/// ```
impl<'a> IntoIterator for &'a DigitSequence {
    type Item = &'a u8;

    type IntoIter = std::slice::Iter<'a, u8>;

    fn into_iter(self) -> Self::IntoIter {
        self.0.iter()
    }
}