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
use crate::vec::Vec;
use core::borrow::{Borrow, BorrowMut};
use core::convert::{AsMut, AsRef};
use core::mem;
use core::ops;
pub struct LinearMap<K, V, const N: usize> {
vec: Vec<(K, V), N>,
}
impl<K, V, const N: usize> LinearMap<K, V, N> {
pub const fn new() -> Self {
LinearMap { vec: Vec::new() }
}
}
impl<K: PartialEq, V, const N: usize> LinearMap<K, V, N> {
fn get_index(&self, key: &K) -> Option<usize> {
if let Some((i, _item)) = self.iter().enumerate().find(|(_i, item)| &item.0 == key) {
Some(i)
} else {
None
}
}
pub fn get(&self, key: &K) -> Option<&V> {
if let Some(i) = self.get_index(key) {
Some(&self[i].1)
} else {
None
}
}
pub fn get_mut(&mut self, key: &K) -> Option<&mut V> {
if let Some(i) = self.get_index(key) {
Some(&mut self[i].1)
} else {
None
}
}
pub fn contains_key(&self, key: &K) -> bool {
self.iter().any(|x| &x.0 == key)
}
pub fn insert(&mut self, key: K, value: V) -> Option<V> {
if let Some(i) = self.get_index(&key) {
Some(mem::replace(&mut self[i].1, value))
} else {
self.vec.push((key, value));
None
}
}
pub fn remove(&mut self, key: &K) -> Option<V> {
if let Some(i) = self.get_index(key) {
let rm = self.vec.swap_remove(i);
Some(rm.1)
} else {
None
}
}
}
impl<K, V, const N: usize> ops::Deref for LinearMap<K, V, N> {
type Target = [(K, V)];
fn deref(&self) -> &[(K, V)] {
self.vec.deref()
}
}
impl<K, V, const N: usize> ops::DerefMut for LinearMap<K, V, N> {
fn deref_mut(&mut self) -> &mut [(K, V)] {
self.vec.deref_mut()
}
}
impl<K, V, const N: usize> AsRef<[(K, V)]> for LinearMap<K, V, N> {
fn as_ref(&self) -> &[(K, V)] {
self
}
}
impl<K, V, const N: usize> AsMut<[(K, V)]> for LinearMap<K, V, N> {
fn as_mut(&mut self) -> &mut [(K, V)] {
self
}
}
impl<K, V, const N: usize> Borrow<[(K, V)]> for LinearMap<K, V, N> {
fn borrow(&self) -> &[(K, V)] {
&self[..]
}
}
impl<K, V, const N: usize> BorrowMut<[(K, V)]> for LinearMap<K, V, N> {
fn borrow_mut(&mut self) -> &mut [(K, V)] {
&mut self[..]
}
}