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 core::mem;
use core::slice;
use std::rc::Rc;
use std::vec;
pub(crate) struct RcVec<T> {
inner: Rc<Vec<T>>,
}
pub(crate) struct RcVecBuilder<T> {
inner: Vec<T>,
}
pub(crate) struct RcVecMut<'a, T> {
inner: &'a mut Vec<T>,
}
#[derive(Clone)]
pub(crate) struct RcVecIntoIter<T> {
inner: vec::IntoIter<T>,
}
impl<T> RcVec<T> {
pub fn is_empty(&self) -> bool {
self.inner.is_empty()
}
pub fn len(&self) -> usize {
self.inner.len()
}
pub fn iter(&self) -> slice::Iter<T> {
self.inner.iter()
}
pub fn make_mut(&mut self) -> RcVecMut<T>
where
T: Clone,
{
RcVecMut {
inner: Rc::make_mut(&mut self.inner),
}
}
pub fn get_mut(&mut self) -> Option<RcVecMut<T>> {
let inner = Rc::get_mut(&mut self.inner)?;
Some(RcVecMut { inner })
}
pub fn make_owned(mut self) -> RcVecBuilder<T>
where
T: Clone,
{
let vec = if let Some(owned) = Rc::get_mut(&mut self.inner) {
mem::replace(owned, Vec::new())
} else {
Vec::clone(&self.inner)
};
RcVecBuilder { inner: vec }
}
}
impl<T> RcVecBuilder<T> {
pub fn new() -> Self {
RcVecBuilder { inner: Vec::new() }
}
pub fn with_capacity(cap: usize) -> Self {
RcVecBuilder {
inner: Vec::with_capacity(cap),
}
}
pub fn push(&mut self, element: T) {
self.inner.push(element);
}
pub fn extend(&mut self, iter: impl IntoIterator<Item = T>) {
self.inner.extend(iter);
}
pub fn as_mut(&mut self) -> RcVecMut<T> {
RcVecMut {
inner: &mut self.inner,
}
}
pub fn build(self) -> RcVec<T> {
RcVec {
inner: Rc::new(self.inner),
}
}
}
impl<'a, T> RcVecMut<'a, T> {
pub fn push(&mut self, element: T) {
self.inner.push(element);
}
pub fn extend(&mut self, iter: impl IntoIterator<Item = T>) {
self.inner.extend(iter);
}
pub fn pop(&mut self) -> Option<T> {
self.inner.pop()
}
pub fn as_mut(&mut self) -> RcVecMut<T> {
RcVecMut { inner: self.inner }
}
}
impl<T> Clone for RcVec<T> {
fn clone(&self) -> Self {
RcVec {
inner: Rc::clone(&self.inner),
}
}
}
impl<T> IntoIterator for RcVecBuilder<T> {
type Item = T;
type IntoIter = RcVecIntoIter<T>;
fn into_iter(self) -> Self::IntoIter {
RcVecIntoIter {
inner: self.inner.into_iter(),
}
}
}
impl<T> Iterator for RcVecIntoIter<T> {
type Item = T;
fn next(&mut self) -> Option<Self::Item> {
self.inner.next()
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
}
|
