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use std::collections::VecDeque;
use std::ops::{Index, IndexMut};
pub struct RingBuffer<T> {
data: VecDeque<T>,
// Abstract index of data[0] in infinitely sized queue
offset: usize,
}
impl<T> RingBuffer<T> {
pub fn new() -> Self {
RingBuffer {
data: VecDeque::new(),
offset: 0,
}
}
pub fn is_empty(&self) -> bool {
self.data.is_empty()
}
pub fn len(&self) -> usize {
self.data.len()
}
pub fn push(&mut self, value: T) -> usize {
let index = self.offset + self.data.len();
self.data.push_back(value);
index
}
pub fn clear(&mut self) {
self.data.clear();
}
pub fn index_of_first(&self) -> usize {
self.offset
}
pub fn first(&self) -> &T {
&self.data[0]
}
pub fn first_mut(&mut self) -> &mut T {
&mut self.data[0]
}
pub fn pop_first(&mut self) -> T {
self.offset += 1;
self.data.pop_front().unwrap()
}
pub fn last(&self) -> &T {
self.data.back().unwrap()
}
pub fn last_mut(&mut self) -> &mut T {
self.data.back_mut().unwrap()
}
pub fn second_last(&self) -> &T {
&self.data[self.data.len() - 2]
}
pub fn pop_last(&mut self) {
self.data.pop_back().unwrap();
}
}
impl<T> Index<usize> for RingBuffer<T> {
type Output = T;
fn index(&self, index: usize) -> &Self::Output {
&self.data[index.checked_sub(self.offset).unwrap()]
}
}
impl<T> IndexMut<usize> for RingBuffer<T> {
fn index_mut(&mut self, index: usize) -> &mut Self::Output {
&mut self.data[index.checked_sub(self.offset).unwrap()]
}
}
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