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use crate::utils::distance_between;
use core::iter::FusedIterator;
use core::marker::PhantomData;
pub struct StaticVecIterConst<'a, T: 'a> {
pub(crate) start: *const T,
pub(crate) end: *const T,
pub(crate) marker: PhantomData<&'a T>,
}
pub struct StaticVecIterMut<'a, T: 'a> {
pub(crate) start: *mut T,
pub(crate) end: *mut T,
pub(crate) marker: PhantomData<&'a mut T>,
}
impl<'a, T: 'a> Iterator for StaticVecIterConst<'a, T> {
type Item = &'a T;
#[inline(always)]
fn next(&mut self) -> Option<Self::Item> {
if self.start < self.end {
unsafe {
let res = Some(&*self.start);
self.start = self.start.offset(1);
res
}
} else {
None
}
}
#[inline(always)]
fn size_hint(&self) -> (usize, Option<usize>) {
let len = distance_between(self.end, self.start);
(len, Some(len))
}
}
impl<'a, T: 'a> DoubleEndedIterator for StaticVecIterConst<'a, T> {
#[inline(always)]
fn next_back(&mut self) -> Option<Self::Item> {
if self.end > self.start {
unsafe {
self.end = self.end.offset(-1);
Some(&*self.end)
}
} else {
None
}
}
}
impl<'a, T: 'a> ExactSizeIterator for StaticVecIterConst<'a, T> {
#[inline(always)]
fn len(&self) -> usize {
distance_between(self.end, self.start)
}
#[inline(always)]
fn is_empty(&self) -> bool {
distance_between(self.end, self.start) == 0
}
}
impl<'a, T: 'a> FusedIterator for StaticVecIterConst<'a, T> {}
impl<'a, T: 'a> Iterator for StaticVecIterMut<'a, T> {
type Item = &'a mut T;
#[inline(always)]
fn next(&mut self) -> Option<Self::Item> {
if self.start < self.end {
unsafe {
let res = Some(&mut *self.start);
self.start = self.start.offset(1);
res
}
} else {
None
}
}
#[inline(always)]
fn size_hint(&self) -> (usize, Option<usize>) {
let len = distance_between(self.end, self.start);
(len, Some(len))
}
}
impl<'a, T: 'a> DoubleEndedIterator for StaticVecIterMut<'a, T> {
#[inline(always)]
fn next_back(&mut self) -> Option<Self::Item> {
if self.end > self.start {
unsafe {
self.end = self.end.offset(-1);
Some(&mut *self.end)
}
} else {
None
}
}
}
impl<'a, T: 'a> ExactSizeIterator for StaticVecIterMut<'a, T> {
#[inline(always)]
fn len(&self) -> usize {
distance_between(self.end, self.start)
}
#[inline(always)]
fn is_empty(&self) -> bool {
distance_between(self.end, self.start) == 0
}
}
impl<'a, T: 'a> FusedIterator for StaticVecIterMut<'a, T> {}