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

use crate::{Slice, SliceBorrowed, SliceMut, SliceOwned};

impl<T, const N: usize> Slice for [T; N] {
    type Output = T;

    fn len(&self) -> usize {
        N
    }

    fn get_with<W: FnMut(&Self::Output) -> R, R>(&self, index: usize, f: &mut W) -> Option<R> {
        Some(f(self.get(index)?))
    }
}

impl<T, const N: usize> SliceOwned for [T; N]
where
    T: Copy,
{
    fn get_owned(&self, index: usize) -> Option<Self::Output> {
        (index < N).then(|| self[index])
    }
}

impl<T, const N: usize> SliceBorrowed for [T; N] {
    fn get(&self, index: usize) -> Option<&Self::Output> {
        (index < N).then(|| &self[index])
    }
}

impl<T, const N: usize> SliceMut for [T; N] {
    fn get_mut(&mut self, index: usize) -> Option<&mut Self::Output> {
        (index < N).then(|| &mut self[index])
    }
}

impl<T> Slice for [T] {
    type Output = T;

    fn len(&self) -> usize {
        (*self).len()
    }

    fn get_with<W: FnMut(&Self::Output) -> R, R>(&self, index: usize, f: &mut W) -> Option<R> {
        Some(f(self.get(index)?))
    }
}

impl<T> SliceOwned for [T]
where
    T: Copy,
{
    fn get_owned(&self, index: usize) -> Option<Self::Output> {
        (index < self.len()).then(|| self[index])
    }
}

impl<T> SliceBorrowed for [T] {
    fn get(&self, index: usize) -> Option<&Self::Output> {
        (index < self.len()).then(|| &self[index])
    }
}

impl<T> SliceMut for [T] {
    fn get_mut(&mut self, index: usize) -> Option<&mut Self::Output> {
        (index < self.len()).then(|| &mut self[index])
    }
}

impl<'a, S> Slice for &'a S
where
    S: Slice + ?Sized,
{
    type Output = S::Output;

    fn len(&self) -> usize {
        (*self).len()
    }

    fn get_with<W: FnMut(&Self::Output) -> R, R>(&self, index: usize, f: &mut W) -> Option<R> {
        (*self).get_with(index, f)
    }
}

impl<'a, S> SliceOwned for &'a S
where
    S: SliceOwned + ?Sized,
{
    fn get_owned(&self, index: usize) -> Option<Self::Output> {
        (*self).get_owned(index)
    }
}

impl<'a, S> SliceBorrowed for &'a S
where
    S: SliceBorrowed + ?Sized,
{
    fn get(&self, index: usize) -> Option<&Self::Output> {
        (**self).get(index)
    }
}

impl<'a, S> Slice for &'a mut S
where
    S: Slice + ?Sized,
{
    type Output = S::Output;

    fn len(&self) -> usize {
        (**self).len()
    }

    fn get_with<W: FnMut(&Self::Output) -> R, R>(&self, index: usize, f: &mut W) -> Option<R> {
        (**self).get_with(index, f)
    }
}

impl<'a, S> SliceOwned for &'a mut S
where
    S: SliceOwned + ?Sized,
{
    fn get_owned(&self, index: usize) -> Option<Self::Output> {
        (**self).get_owned(index)
    }
}

impl<'a, S> SliceBorrowed for &'a mut S
where
    S: SliceBorrowed + ?Sized,
{
    fn get(&self, index: usize) -> Option<&Self::Output> {
        (**self).get(index)
    }
}

impl<'a, S> SliceMut for &'a mut S
where
    S: SliceMut + ?Sized,
{
    fn get_mut(&mut self, index: usize) -> Option<&mut Self::Output> {
        (**self).get_mut(index)
    }
}