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#![deny(missing_docs)]
#![deny(warnings)]
#![feature(const_fn)]
#![no_std]
use core::marker::PhantomData;
use core::ops::Deref;
use core::slice;
pub struct CircularBuffer<T, A>
where
A: AsMut<[T]> + AsRef<[T]>,
T: Copy,
{
_marker: PhantomData<[T]>,
array: A,
index: usize,
len: usize,
}
impl<T, A> CircularBuffer<T, A>
where
A: AsMut<[T]> + AsRef<[T]>,
T: Copy,
{
pub const fn new(array: A) -> Self {
CircularBuffer {
_marker: PhantomData,
array: array,
index: 0,
len: 0,
}
}
pub fn capacity(&self) -> usize {
self.array.as_ref().len()
}
pub fn push(&mut self, elem: T) {
let slice = self.array.as_mut();
if self.len < slice.len() {
self.len += 1;
}
unsafe { *slice.as_mut_ptr().offset(self.index as isize) = elem };
self.index = (self.index + 1) % slice.len();
}
}
impl<T, A> Deref for CircularBuffer<T, A>
where
A: AsMut<[T]> + AsRef<[T]>,
T: Copy,
{
type Target = [T];
fn deref(&self) -> &[T] {
let slice = self.array.as_ref();
if self.len == slice.len() {
slice
} else {
unsafe { slice::from_raw_parts(slice.as_ptr(), self.len) }
}
}
}
pub struct Vec<T, A>
where
A: AsMut<[T]> + AsRef<[T]>,
T: Copy,
{
_marker: PhantomData<[T]>,
array: A,
len: usize,
}
impl<T, A> Vec<T, A>
where
A: AsMut<[T]> + AsRef<[T]>,
T: Copy,
{
pub const fn new(array: A) -> Self {
Vec {
_marker: PhantomData,
array: array,
len: 0,
}
}
pub fn capacity(&self) -> usize {
self.array.as_ref().len()
}
pub fn clear(&mut self) {
self.len = 0;
}
pub fn pop(&mut self) -> Option<T> {
if self.len == 0 {
None
} else {
self.len -= 1;
unsafe {
Some(
*self.array
.as_mut()
.as_mut_ptr()
.offset(self.len as isize),
)
}
}
}
pub fn push(&mut self, elem: T) -> Result<(), ()> {
let slice = self.array.as_mut();
if self.len == slice.len() {
Err(())
} else {
unsafe {
*slice.as_mut_ptr().offset(self.len as isize) = elem;
}
self.len += 1;
Ok(())
}
}
}
impl<T, A> Deref for Vec<T, A>
where
A: AsMut<[T]> + AsRef<[T]>,
T: Copy,
{
type Target = [T];
fn deref(&self) -> &[T] {
unsafe { slice::from_raw_parts(self.array.as_ref().as_ptr(), self.len) }
}
}