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use alloc::rc::Rc;
use alloc::vec;
use core::mem;
use core::panic::RefUnwindSafe;
use core::slice;
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::take(owned)
} 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()
}
}
impl<T> RefUnwindSafe for RcVec<T> where T: RefUnwindSafe {}