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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
use core::{
cmp, hash,
iter::DoubleEndedIterator,
mem,
ops::{Deref, DerefMut},
pin::Pin,
};
#[derive(Debug)]
#[cfg_attr(feature = "validation", derive(bytecheck::CheckBytes))]
#[repr(u8)]
pub enum ArchivedOption<T> {
None,
Some(T),
}
impl<T> ArchivedOption<T> {
#[inline]
pub fn is_none(&self) -> bool {
match self {
ArchivedOption::None => true,
ArchivedOption::Some(_) => false,
}
}
#[inline]
pub fn is_some(&self) -> bool {
match self {
ArchivedOption::None => false,
ArchivedOption::Some(_) => true,
}
}
#[inline]
pub const fn as_ref(&self) -> Option<&T> {
match self {
ArchivedOption::None => None,
ArchivedOption::Some(value) => Some(value),
}
}
#[inline]
pub fn as_mut(&mut self) -> Option<&mut T> {
match self {
ArchivedOption::None => None,
ArchivedOption::Some(value) => Some(value),
}
}
#[inline]
pub fn as_pin_ref(self: Pin<&Self>) -> Option<Pin<&T>> {
unsafe { Pin::get_ref(self).as_ref().map(|x| Pin::new_unchecked(x)) }
}
#[inline]
pub fn as_pin_mut(self: Pin<&mut Self>) -> Option<Pin<&mut T>> {
unsafe {
Pin::get_unchecked_mut(self)
.as_mut()
.map(|x| Pin::new_unchecked(x))
}
}
#[inline]
pub const fn iter(&self) -> Iter<'_, T> {
Iter {
inner: self.as_ref(),
}
}
#[inline]
pub fn iter_mut(&mut self) -> IterMut<'_, T> {
IterMut {
inner: self.as_mut(),
}
}
#[inline]
pub fn get_or_insert(&mut self, v: T) -> &mut T {
self.get_or_insert_with(move || v)
}
#[inline]
pub fn get_or_insert_with<F: FnOnce() -> T>(&mut self, f: F) -> &mut T {
if let ArchivedOption::Some(ref mut value) = self {
value
} else {
*self = ArchivedOption::Some(f());
self.as_mut().unwrap()
}
}
}
impl<T: Deref> ArchivedOption<T> {
#[inline]
pub fn as_deref(&self) -> Option<&<T as Deref>::Target> {
self.as_ref().map(|x| x.deref())
}
}
impl<T: DerefMut> ArchivedOption<T> {
#[inline]
pub fn as_deref_mut(&mut self) -> Option<&mut <T as Deref>::Target> {
self.as_mut().map(|x| x.deref_mut())
}
}
impl<T: Eq> Eq for ArchivedOption<T> {}
impl<T: hash::Hash> hash::Hash for ArchivedOption<T> {
#[inline]
fn hash<H: hash::Hasher>(&self, state: &mut H) {
self.as_ref().hash(state)
}
}
impl<T: Ord> Ord for ArchivedOption<T> {
#[inline]
fn cmp(&self, other: &Self) -> cmp::Ordering {
self.as_ref().cmp(&other.as_ref())
}
}
impl<T: PartialEq> PartialEq for ArchivedOption<T> {
#[inline]
fn eq(&self, other: &Self) -> bool {
self.as_ref().eq(&other.as_ref())
}
}
impl<T: PartialOrd> PartialOrd for ArchivedOption<T> {
#[inline]
fn partial_cmp(&self, other: &Self) -> Option<cmp::Ordering> {
self.as_ref().partial_cmp(&other.as_ref())
}
}
impl<T, U: PartialEq<T>> PartialEq<Option<T>> for ArchivedOption<U> {
#[inline]
fn eq(&self, other: &Option<T>) -> bool {
if let ArchivedOption::Some(self_value) = self {
if let Some(other_value) = other {
self_value.eq(other_value)
} else {
false
}
} else {
other.is_none()
}
}
}
impl<T: PartialEq<U>, U> PartialEq<ArchivedOption<T>> for Option<U> {
#[inline]
fn eq(&self, other: &ArchivedOption<T>) -> bool {
other.eq(self)
}
}
pub struct Iter<'a, T> {
pub(crate) inner: Option<&'a T>,
}
impl<'a, T> Iterator for Iter<'a, T> {
type Item = &'a T;
fn next(&mut self) -> Option<Self::Item> {
let mut result = None;
mem::swap(&mut self.inner, &mut result);
result
}
}
impl<'a, T> DoubleEndedIterator for Iter<'a, T> {
fn next_back(&mut self) -> Option<Self::Item> {
self.next()
}
}
pub struct IterMut<'a, T> {
pub(crate) inner: Option<&'a mut T>,
}
impl<'a, T> Iterator for IterMut<'a, T> {
type Item = &'a mut T;
fn next(&mut self) -> Option<Self::Item> {
let mut result = None;
mem::swap(&mut self.inner, &mut result);
result
}
}
impl<'a, T> DoubleEndedIterator for IterMut<'a, T> {
fn next_back(&mut self) -> Option<Self::Item> {
self.next()
}
}