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use std::mem;
use std::ptr::NonNull;
use crate::imp_prelude::*;
use crate::OwnedRepr;
use super::Baseiter;
use crate::impl_owned_array::drop_unreachable_raw;
pub struct IntoIter<A, D>
where
D: Dimension,
{
array_data: OwnedRepr<A>,
inner: Baseiter<A, D>,
data_len: usize,
array_head_ptr: NonNull<A>,
has_unreachable_elements: bool,
}
impl<A, D> IntoIter<A, D>
where
D: Dimension,
{
pub(crate) fn new(mut array: Array<A, D>) -> Self {
unsafe {
let array_head_ptr = array.ptr;
let ptr = array.as_mut_ptr();
let mut array_data = array.data;
let data_len = array_data.release_all_elements();
debug_assert!(data_len >= array.dim.size());
let has_unreachable_elements = array.dim.size() != data_len;
let inner = Baseiter::new(ptr, array.dim, array.strides);
IntoIter {
array_data,
inner,
data_len,
array_head_ptr,
has_unreachable_elements,
}
}
}
}
impl<A, D: Dimension> Iterator for IntoIter<A, D> {
type Item = A;
#[inline]
fn next(&mut self) -> Option<A> {
self.inner.next().map(|p| unsafe { p.read() })
}
fn size_hint(&self) -> (usize, Option<usize>) {
self.inner.size_hint()
}
}
impl<A, D: Dimension> ExactSizeIterator for IntoIter<A, D> {
fn len(&self) -> usize { self.inner.len() }
}
impl<A, D> Drop for IntoIter<A, D>
where
D: Dimension
{
fn drop(&mut self) {
if !self.has_unreachable_elements || mem::size_of::<A>() == 0 || !mem::needs_drop::<A>() {
return;
}
while let Some(_) = self.next() { }
unsafe {
let data_ptr = self.array_data.as_ptr_mut();
let view = RawArrayViewMut::new(self.array_head_ptr, self.inner.dim.clone(),
self.inner.strides.clone());
debug_assert!(self.inner.dim.size() < self.data_len, "data_len {} and dim size {}",
self.data_len, self.inner.dim.size());
drop_unreachable_raw(view, data_ptr, self.data_len);
}
}
}
impl<A, D> IntoIterator for Array<A, D>
where
D: Dimension
{
type Item = A;
type IntoIter = IntoIter<A, D>;
fn into_iter(self) -> Self::IntoIter {
IntoIter::new(self)
}
}
impl<A, D> IntoIterator for ArcArray<A, D>
where
D: Dimension,
A: Clone,
{
type Item = A;
type IntoIter = IntoIter<A, D>;
fn into_iter(self) -> Self::IntoIter {
IntoIter::new(self.into_owned())
}
}
impl<A, D> IntoIterator for CowArray<'_, A, D>
where
D: Dimension,
A: Clone,
{
type Item = A;
type IntoIter = IntoIter<A, D>;
fn into_iter(self) -> Self::IntoIter {
IntoIter::new(self.into_owned())
}
}