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//! Parallel iterator types for [arrays] (`[T; N]`)
//!
//! You will rarely need to interact with this module directly unless you need
//! to name one of the iterator types.
//!
use crate::iter::plumbing::*;
use crate::iter::*;
use crate::slice::{Iter, IterMut};
use crate::vec::DrainProducer;
use std::mem::ManuallyDrop;
impl<'data, T: Sync + 'data, const N: usize> IntoParallelIterator for &'data [T; N] {
type Item = &'data T;
type Iter = Iter<'data, T>;
fn into_par_iter(self) -> Self::Iter {
<&[T]>::into_par_iter(self)
}
}
impl<'data, T: Send + 'data, const N: usize> IntoParallelIterator for &'data mut [T; N] {
type Item = &'data mut T;
type Iter = IterMut<'data, T>;
fn into_par_iter(self) -> Self::Iter {
<&mut [T]>::into_par_iter(self)
}
}
impl<T: Send, const N: usize> IntoParallelIterator for [T; N] {
type Item = T;
type Iter = IntoIter<T, N>;
fn into_par_iter(self) -> Self::Iter {
IntoIter { array: self }
}
}
/// Parallel iterator that moves out of an array.
#[derive(Debug, Clone)]
pub struct IntoIter<T: Send, const N: usize> {
array: [T; N],
}
impl<T: Send, const N: usize> ParallelIterator for IntoIter<T, N> {
type Item = T;
fn drive_unindexed<C>(self, consumer: C) -> C::Result
where
C: UnindexedConsumer<Self::Item>,
{
bridge(self, consumer)
}
fn opt_len(&self) -> Option<usize> {
Some(N)
}
}
impl<T: Send, const N: usize> IndexedParallelIterator for IntoIter<T, N> {
fn drive<C>(self, consumer: C) -> C::Result
where
C: Consumer<Self::Item>,
{
bridge(self, consumer)
}
fn len(&self) -> usize {
N
}
fn with_producer<CB>(self, callback: CB) -> CB::Output
where
CB: ProducerCallback<Self::Item>,
{
unsafe {
// Drain every item, and then the local array can just fall out of scope.
let mut array = ManuallyDrop::new(self.array);
let producer = DrainProducer::new(array.as_mut_slice());
callback.callback(producer)
}
}
}