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authorValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
committerValentin Popov <valentin@popov.link>2024-07-19 15:37:58 +0300
commita990de90fe41456a23e58bd087d2f107d321f3a1 (patch)
tree15afc392522a9e85dc3332235e311b7d39352ea9 /vendor/rayon/src/iter/repeat.rs
parent3d48cd3f81164bbfc1a755dc1d4a9a02f98c8ddd (diff)
downloadfparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.tar.xz
fparkan-a990de90fe41456a23e58bd087d2f107d321f3a1.zip
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-use super::plumbing::*;
-use super::*;
-use std::iter;
-use std::usize;
-
-/// Iterator adaptor for [the `repeat()` function](fn.repeat.html).
-#[derive(Debug, Clone)]
-pub struct Repeat<T: Clone + Send> {
- element: T,
-}
-
-/// Creates a parallel iterator that endlessly repeats `elt` (by
-/// cloning it). Note that this iterator has "infinite" length, so
-/// typically you would want to use `zip` or `take` or some other
-/// means to shorten it, or consider using
-/// [the `repeatn()` function](fn.repeatn.html) instead.
-///
-/// # Examples
-///
-/// ```
-/// use rayon::prelude::*;
-/// use rayon::iter::repeat;
-/// let x: Vec<(i32, i32)> = repeat(22).zip(0..3).collect();
-/// assert_eq!(x, vec![(22, 0), (22, 1), (22, 2)]);
-/// ```
-pub fn repeat<T: Clone + Send>(elt: T) -> Repeat<T> {
- Repeat { element: elt }
-}
-
-impl<T> Repeat<T>
-where
- T: Clone + Send,
-{
- /// Takes only `n` repeats of the element, similar to the general
- /// [`take()`](trait.IndexedParallelIterator.html#method.take).
- ///
- /// The resulting `RepeatN` is an `IndexedParallelIterator`, allowing
- /// more functionality than `Repeat` alone.
- pub fn take(self, n: usize) -> RepeatN<T> {
- repeatn(self.element, n)
- }
-
- /// Iterates tuples, repeating the element with items from another
- /// iterator, similar to the general
- /// [`zip()`](trait.IndexedParallelIterator.html#method.zip).
- pub fn zip<Z>(self, zip_op: Z) -> Zip<RepeatN<T>, Z::Iter>
- where
- Z: IntoParallelIterator,
- Z::Iter: IndexedParallelIterator,
- {
- let z = zip_op.into_par_iter();
- let n = z.len();
- self.take(n).zip(z)
- }
-}
-
-impl<T> ParallelIterator for Repeat<T>
-where
- T: Clone + Send,
-{
- type Item = T;
-
- fn drive_unindexed<C>(self, consumer: C) -> C::Result
- where
- C: UnindexedConsumer<Self::Item>,
- {
- let producer = RepeatProducer {
- element: self.element,
- };
- bridge_unindexed(producer, consumer)
- }
-}
-
-/// Unindexed producer for `Repeat`.
-struct RepeatProducer<T: Clone + Send> {
- element: T,
-}
-
-impl<T: Clone + Send> UnindexedProducer for RepeatProducer<T> {
- type Item = T;
-
- fn split(self) -> (Self, Option<Self>) {
- (
- RepeatProducer {
- element: self.element.clone(),
- },
- Some(RepeatProducer {
- element: self.element,
- }),
- )
- }
-
- fn fold_with<F>(self, folder: F) -> F
- where
- F: Folder<T>,
- {
- folder.consume_iter(iter::repeat(self.element))
- }
-}
-
-/// Iterator adaptor for [the `repeatn()` function](fn.repeatn.html).
-#[derive(Debug, Clone)]
-pub struct RepeatN<T: Clone + Send> {
- element: T,
- count: usize,
-}
-
-/// Creates a parallel iterator that produces `n` repeats of `elt`
-/// (by cloning it).
-///
-/// # Examples
-///
-/// ```
-/// use rayon::prelude::*;
-/// use rayon::iter::repeatn;
-/// let x: Vec<(i32, i32)> = repeatn(22, 3).zip(0..3).collect();
-/// assert_eq!(x, vec![(22, 0), (22, 1), (22, 2)]);
-/// ```
-pub fn repeatn<T: Clone + Send>(elt: T, n: usize) -> RepeatN<T> {
- RepeatN {
- element: elt,
- count: n,
- }
-}
-
-impl<T> ParallelIterator for RepeatN<T>
-where
- T: Clone + Send,
-{
- 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(self.count)
- }
-}
-
-impl<T> IndexedParallelIterator for RepeatN<T>
-where
- T: Clone + Send,
-{
- fn drive<C>(self, consumer: C) -> C::Result
- where
- C: Consumer<Self::Item>,
- {
- bridge(self, consumer)
- }
-
- fn with_producer<CB>(self, callback: CB) -> CB::Output
- where
- CB: ProducerCallback<Self::Item>,
- {
- callback.callback(RepeatNProducer {
- element: self.element,
- count: self.count,
- })
- }
-
- fn len(&self) -> usize {
- self.count
- }
-}
-
-/// Producer for `RepeatN`.
-struct RepeatNProducer<T: Clone + Send> {
- element: T,
- count: usize,
-}
-
-impl<T: Clone + Send> Producer for RepeatNProducer<T> {
- type Item = T;
- type IntoIter = Iter<T>;
-
- fn into_iter(self) -> Self::IntoIter {
- Iter {
- element: self.element,
- count: self.count,
- }
- }
-
- fn split_at(self, index: usize) -> (Self, Self) {
- (
- RepeatNProducer {
- element: self.element.clone(),
- count: index,
- },
- RepeatNProducer {
- element: self.element,
- count: self.count - index,
- },
- )
- }
-}
-
-/// Iterator for `RepeatN`.
-///
-/// This is conceptually like `std::iter::Take<std::iter::Repeat<T>>`, but
-/// we need `DoubleEndedIterator` and unconditional `ExactSizeIterator`.
-struct Iter<T: Clone> {
- element: T,
- count: usize,
-}
-
-impl<T: Clone> Iterator for Iter<T> {
- type Item = T;
-
- #[inline]
- fn next(&mut self) -> Option<T> {
- if self.count > 0 {
- self.count -= 1;
- Some(self.element.clone())
- } else {
- None
- }
- }
-
- #[inline]
- fn size_hint(&self) -> (usize, Option<usize>) {
- (self.count, Some(self.count))
- }
-}
-
-impl<T: Clone> DoubleEndedIterator for Iter<T> {
- #[inline]
- fn next_back(&mut self) -> Option<T> {
- self.next()
- }
-}
-
-impl<T: Clone> ExactSizeIterator for Iter<T> {
- #[inline]
- fn len(&self) -> usize {
- self.count
- }
-}