| 1 | |
| 2 |
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| 3 | use alloc::rc::Rc;
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| 4 | use alloc::vec;
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| 5 | use core::mem;
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| 6 | use core::panic::RefUnwindSafe;
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| 7 | use core::slice;
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| 8 |
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| 9 | pub(crate) struct RcVec<T> {
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| 10 | inner: Rc<Vec<T>>,
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| 11 | }
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| 12 |
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| 13 | pub(crate) struct RcVecBuilder<T> {
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| 14 | inner: Vec<T>,
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| 15 | }
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| 16 |
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| 17 | pub(crate) struct RcVecMut<'a, T> {
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| 18 | inner: &'a mut Vec<T>,
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| 19 | }
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| 20 |
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| 21 | #[derive(Clone)]
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| 22 | pub(crate) struct RcVecIntoIter<T> {
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| 23 | inner: vec::IntoIter<T>,
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| 24 | }
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| 25 |
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| 26 | impl<T> RcVec<T> {
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| 27 | pub(crate) fn is_empty(&self) -> bool {
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| 28 | self.inner.is_empty()
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| 29 | }
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| 30 |
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| 31 | pub(crate) fn len(&self) -> usize {
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| 32 | self.inner.len()
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| 33 | }
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| 34 |
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| 35 | pub(crate) fn iter(&self) -> slice::Iter<T> {
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| 36 | self.inner.iter()
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| 37 | }
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| 38 |
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| 39 | pub(crate) fn make_mut(&mut self) -> RcVecMut<T>
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| 40 | where
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| 41 | T: Clone,
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| 42 | {
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| 43 | RcVecMut {
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| 44 | inner: Rc::make_mut(&mut self.inner),
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| 45 | }
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| 46 | }
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| 47 |
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| 48 | pub(crate) fn get_mut(&mut self) -> Option<RcVecMut<T>> {
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| 49 | let inner = Rc::get_mut(&mut self.inner)?;
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| 50 | Some(RcVecMut { inner })
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| 51 | }
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| 52 |
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| 53 | pub(crate) fn make_owned(mut self) -> RcVecBuilder<T>
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| 54 | where
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| 55 | T: Clone,
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| 56 | {
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| 57 | let vec = if let Some(owned) = Rc::get_mut(&mut self.inner) {
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| 58 | mem::take(owned)
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| 59 | } else {
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| 60 | Vec::clone(&self.inner)
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| 61 | };
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| 62 | RcVecBuilder { inner: vec }
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| 63 | }
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| 64 | }
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| 65 |
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| 66 | impl<T> RcVecBuilder<T> {
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| 67 | pub(crate) fn new() -> Self {
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| 68 | RcVecBuilder { inner: Vec::new() }
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| 69 | }
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| 70 |
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| 71 | pub(crate) fn with_capacity(cap: usize) -> Self {
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| 72 | RcVecBuilder {
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| 73 | inner: Vec::with_capacity(cap),
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| 74 | }
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| 75 | }
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| 76 |
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| 77 | pub(crate) fn push(&mut self, element: T) {
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| 78 | self.inner.push(element);
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| 79 | }
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| 80 |
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| 81 | pub(crate) fn extend(&mut self, iter: impl IntoIterator<Item = T>) {
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| 82 | self.inner.extend(iter);
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| 83 | }
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| 84 |
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| 85 | pub(crate) fn as_mut(&mut self) -> RcVecMut<T> {
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| 86 | RcVecMut {
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| 87 | inner: &mut self.inner,
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| 88 | }
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| 89 | }
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| 90 |
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| 91 | pub(crate) fn build(self) -> RcVec<T> {
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| 92 | RcVec {
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| 93 | inner: Rc::new(self.inner),
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| 94 | }
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| 95 | }
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| 96 | }
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| 97 |
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| 98 | impl<'a, T> RcVecMut<'a, T> {
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| 99 | pub(crate) fn push(&mut self, element: T) {
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| 100 | self.inner.push(element);
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| 101 | }
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| 102 |
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| 103 | pub(crate) fn extend(&mut self, iter: impl IntoIterator<Item = T>) {
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| 104 | self.inner.extend(iter);
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| 105 | }
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| 106 |
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| 107 | pub(crate) fn as_mut(&mut self) -> RcVecMut<T> {
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| 108 | RcVecMut { inner: self.inner }
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| 109 | }
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| 110 |
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| 111 | pub(crate) fn take(self) -> RcVecBuilder<T> {
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| 112 | let vec = mem::take(self.inner);
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| 113 | RcVecBuilder { inner: vec }
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| 114 | }
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| 115 | }
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| 116 |
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| 117 | impl<T> Clone for RcVec<T> {
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| 118 | fn clone(&self) -> Self {
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| 119 | RcVec {
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| 120 | inner: Rc::clone(&self.inner),
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| 121 | }
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| 122 | }
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| 123 | }
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| 124 |
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| 125 | impl<T> IntoIterator for RcVecBuilder<T> {
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| 126 | type Item = T;
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| 127 | type IntoIter = RcVecIntoIter<T>;
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| 128 |
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| 129 | fn into_iter(self) -> Self::IntoIter {
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| 130 | RcVecIntoIter {
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| 131 | inner: self.inner.into_iter(),
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| 132 | }
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| 133 | }
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| 134 | }
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| 135 |
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| 136 | impl<T> Iterator for RcVecIntoIter<T> {
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| 137 | type Item = T;
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| 138 |
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| 139 | fn next(&mut self) -> Option<Self::Item> {
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| 140 | self.inner.next()
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| 141 | }
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| 142 |
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| 143 | fn size_hint(&self) -> (usize, Option<usize>) {
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| 144 | self.inner.size_hint()
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| 145 | }
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| 146 | }
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| 147 |
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| 148 | impl<T> RefUnwindSafe for RcVec<T> where T: RefUnwindSafe {}
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