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75 lines
1.1 KiB
75 lines
1.1 KiB
use std::{
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collections::{
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LinkedList,
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linked_list,
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},
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iter::Rev,
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};
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pub struct FixedStack<T>(LinkedList<T>, usize);
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pub type Iter<'a, T> = Rev<linked_list::Iter<'a, T>>;
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pub type IterMut<'a, T> = Rev<linked_list::IterMut<'a, T>>;
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pub type IntoIter<T> = Rev<linked_list::IntoIter<T>>;
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impl<T> FixedStack<T>
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{
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#[inline] pub fn new(sz: usize) -> Self
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{
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Self (
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LinkedList::new(),
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sz
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)
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}
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/// Try to push an item, returns Ok(()) if successful
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pub fn push(&mut self, item: T)
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{
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if self.0.len() >= self.1 {
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self.0.pop_back();
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}
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self.0.push_front(item);
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}
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pub fn clear(&mut self)
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{
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self.0.clear()
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}
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pub fn pop(&mut self) -> Option<T>
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{
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self.0.pop_back()
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}
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pub fn len(&self) -> usize
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{
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self.0.len()
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}
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pub fn cap(&self) -> usize
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{
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self.1
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}
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pub fn iter(&self) -> Iter<T>
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{
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self.0.iter().rev()
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}
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pub fn iter_mut(&mut self)-> IterMut<T>
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{
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self.0.iter_mut().rev()
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}
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}
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impl<T> IntoIterator for FixedStack<T>
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{
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type Item=T;
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type IntoIter = IntoIter<T>;
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fn into_iter(self)-> Self::IntoIter
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{
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self.0.into_iter().rev()
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}
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}
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