use core::marker::PhantomData;
use crate::{Slice, SliceMut};
#[derive(Clone, Copy, PartialEq, Eq, Hash)]
pub struct Reverse<T, A>(pub A, PhantomData<fn() -> T>);
impl<T, A> Reverse<T, A>
where
A: Slice<T>,
{
pub fn new(data: A) -> Self {
Self(data, PhantomData)
}
}
impl<T, A> Slice<T> for Reverse<T, A>
where
A: Slice<T>,
{
fn get(&self, index: usize) -> Option<&T> {
if index >= self.len() {
return None;
}
self.0.get(self.0.len() - index - 1)
}
fn len(&self) -> usize {
self.0.len()
}
}
impl<T, A> SliceMut<T> for Reverse<T, A>
where
A: SliceMut<T>,
{
fn get_mut(&mut self, index: usize) -> Option<&mut T> {
if index >= self.len() {
return None;
}
self.0.get_mut(self.0.len() - index - 1)
}
}