diff options
Diffstat (limited to 'vendor/rustc-rayon/src/iter/map_with.rs')
-rw-r--r-- | vendor/rustc-rayon/src/iter/map_with.rs | 573 |
1 files changed, 573 insertions, 0 deletions
diff --git a/vendor/rustc-rayon/src/iter/map_with.rs b/vendor/rustc-rayon/src/iter/map_with.rs new file mode 100644 index 000000000..10b1b4cac --- /dev/null +++ b/vendor/rustc-rayon/src/iter/map_with.rs @@ -0,0 +1,573 @@ +use super::plumbing::*; +use super::*; + +use std::fmt::{self, Debug}; + +/// `MapWith` is an iterator that transforms the elements of an underlying iterator. +/// +/// This struct is created by the [`map_with()`] method on [`ParallelIterator`] +/// +/// [`map_with()`]: trait.ParallelIterator.html#method.map_with +/// [`ParallelIterator`]: trait.ParallelIterator.html +#[must_use = "iterator adaptors are lazy and do nothing unless consumed"] +#[derive(Clone)] +pub struct MapWith<I: ParallelIterator, T, F> { + base: I, + item: T, + map_op: F, +} + +impl<I: ParallelIterator + Debug, T: Debug, F> Debug for MapWith<I, T, F> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("MapWith") + .field("base", &self.base) + .field("item", &self.item) + .finish() + } +} + +impl<I, T, F> MapWith<I, T, F> +where + I: ParallelIterator, +{ + /// Creates a new `MapWith` iterator. + pub(super) fn new(base: I, item: T, map_op: F) -> Self { + MapWith { base, item, map_op } + } +} + +impl<I, T, F, R> ParallelIterator for MapWith<I, T, F> +where + I: ParallelIterator, + T: Send + Clone, + F: Fn(&mut T, I::Item) -> R + Sync + Send, + R: Send, +{ + type Item = R; + + fn drive_unindexed<C>(self, consumer: C) -> C::Result + where + C: UnindexedConsumer<Self::Item>, + { + let consumer1 = MapWithConsumer::new(consumer, self.item, &self.map_op); + self.base.drive_unindexed(consumer1) + } + + fn opt_len(&self) -> Option<usize> { + self.base.opt_len() + } +} + +impl<I, T, F, R> IndexedParallelIterator for MapWith<I, T, F> +where + I: IndexedParallelIterator, + T: Send + Clone, + F: Fn(&mut T, I::Item) -> R + Sync + Send, + R: Send, +{ + fn drive<C>(self, consumer: C) -> C::Result + where + C: Consumer<Self::Item>, + { + let consumer1 = MapWithConsumer::new(consumer, self.item, &self.map_op); + self.base.drive(consumer1) + } + + fn len(&self) -> usize { + self.base.len() + } + + fn with_producer<CB>(self, callback: CB) -> CB::Output + where + CB: ProducerCallback<Self::Item>, + { + return self.base.with_producer(Callback { + callback, + item: self.item, + map_op: self.map_op, + }); + + struct Callback<CB, U, F> { + callback: CB, + item: U, + map_op: F, + } + + impl<T, U, F, R, CB> ProducerCallback<T> for Callback<CB, U, F> + where + CB: ProducerCallback<R>, + U: Send + Clone, + F: Fn(&mut U, T) -> R + Sync, + R: Send, + { + type Output = CB::Output; + + fn callback<P>(self, base: P) -> CB::Output + where + P: Producer<Item = T>, + { + let producer = MapWithProducer { + base, + item: self.item, + map_op: &self.map_op, + }; + self.callback.callback(producer) + } + } + } +} + +/// //////////////////////////////////////////////////////////////////////// + +struct MapWithProducer<'f, P, U, F> { + base: P, + item: U, + map_op: &'f F, +} + +impl<'f, P, U, F, R> Producer for MapWithProducer<'f, P, U, F> +where + P: Producer, + U: Send + Clone, + F: Fn(&mut U, P::Item) -> R + Sync, + R: Send, +{ + type Item = R; + type IntoIter = MapWithIter<'f, P::IntoIter, U, F>; + + fn into_iter(self) -> Self::IntoIter { + MapWithIter { + base: self.base.into_iter(), + item: self.item, + map_op: self.map_op, + } + } + + fn min_len(&self) -> usize { + self.base.min_len() + } + fn max_len(&self) -> usize { + self.base.max_len() + } + + fn split_at(self, index: usize) -> (Self, Self) { + let (left, right) = self.base.split_at(index); + ( + MapWithProducer { + base: left, + item: self.item.clone(), + map_op: self.map_op, + }, + MapWithProducer { + base: right, + item: self.item, + map_op: self.map_op, + }, + ) + } + + fn fold_with<G>(self, folder: G) -> G + where + G: Folder<Self::Item>, + { + let folder1 = MapWithFolder { + base: folder, + item: self.item, + map_op: self.map_op, + }; + self.base.fold_with(folder1).base + } +} + +struct MapWithIter<'f, I, U, F> { + base: I, + item: U, + map_op: &'f F, +} + +impl<'f, I, U, F, R> Iterator for MapWithIter<'f, I, U, F> +where + I: Iterator, + F: Fn(&mut U, I::Item) -> R + Sync, + R: Send, +{ + type Item = R; + + fn next(&mut self) -> Option<R> { + let item = self.base.next()?; + Some((self.map_op)(&mut self.item, item)) + } + + fn size_hint(&self) -> (usize, Option<usize>) { + self.base.size_hint() + } +} + +impl<'f, I, U, F, R> DoubleEndedIterator for MapWithIter<'f, I, U, F> +where + I: DoubleEndedIterator, + F: Fn(&mut U, I::Item) -> R + Sync, + R: Send, +{ + fn next_back(&mut self) -> Option<R> { + let item = self.base.next_back()?; + Some((self.map_op)(&mut self.item, item)) + } +} + +impl<'f, I, U, F, R> ExactSizeIterator for MapWithIter<'f, I, U, F> +where + I: ExactSizeIterator, + F: Fn(&mut U, I::Item) -> R + Sync, + R: Send, +{ +} + +/// //////////////////////////////////////////////////////////////////////// +/// Consumer implementation + +struct MapWithConsumer<'f, C, U, F> { + base: C, + item: U, + map_op: &'f F, +} + +impl<'f, C, U, F> MapWithConsumer<'f, C, U, F> { + fn new(base: C, item: U, map_op: &'f F) -> Self { + MapWithConsumer { base, item, map_op } + } +} + +impl<'f, T, U, R, C, F> Consumer<T> for MapWithConsumer<'f, C, U, F> +where + C: Consumer<R>, + U: Send + Clone, + F: Fn(&mut U, T) -> R + Sync, + R: Send, +{ + type Folder = MapWithFolder<'f, C::Folder, U, F>; + type Reducer = C::Reducer; + type Result = C::Result; + + fn split_at(self, index: usize) -> (Self, Self, Self::Reducer) { + let (left, right, reducer) = self.base.split_at(index); + ( + MapWithConsumer::new(left, self.item.clone(), self.map_op), + MapWithConsumer::new(right, self.item, self.map_op), + reducer, + ) + } + + fn into_folder(self) -> Self::Folder { + MapWithFolder { + base: self.base.into_folder(), + item: self.item, + map_op: self.map_op, + } + } + + fn full(&self) -> bool { + self.base.full() + } +} + +impl<'f, T, U, R, C, F> UnindexedConsumer<T> for MapWithConsumer<'f, C, U, F> +where + C: UnindexedConsumer<R>, + U: Send + Clone, + F: Fn(&mut U, T) -> R + Sync, + R: Send, +{ + fn split_off_left(&self) -> Self { + MapWithConsumer::new(self.base.split_off_left(), self.item.clone(), self.map_op) + } + + fn to_reducer(&self) -> Self::Reducer { + self.base.to_reducer() + } +} + +struct MapWithFolder<'f, C, U, F> { + base: C, + item: U, + map_op: &'f F, +} + +impl<'f, T, U, R, C, F> Folder<T> for MapWithFolder<'f, C, U, F> +where + C: Folder<R>, + F: Fn(&mut U, T) -> R, +{ + type Result = C::Result; + + fn consume(mut self, item: T) -> Self { + let mapped_item = (self.map_op)(&mut self.item, item); + self.base = self.base.consume(mapped_item); + self + } + + fn consume_iter<I>(mut self, iter: I) -> Self + where + I: IntoIterator<Item = T>, + { + fn with<'f, T, U, R>( + item: &'f mut U, + map_op: impl Fn(&mut U, T) -> R + 'f, + ) -> impl FnMut(T) -> R + 'f { + move |x| map_op(item, x) + } + + { + let mapped_iter = iter.into_iter().map(with(&mut self.item, self.map_op)); + self.base = self.base.consume_iter(mapped_iter); + } + self + } + + fn complete(self) -> C::Result { + self.base.complete() + } + + fn full(&self) -> bool { + self.base.full() + } +} + +// ------------------------------------------------------------------------------------------------ + +/// `MapInit` is an iterator that transforms the elements of an underlying iterator. +/// +/// This struct is created by the [`map_init()`] method on [`ParallelIterator`] +/// +/// [`map_init()`]: trait.ParallelIterator.html#method.map_init +/// [`ParallelIterator`]: trait.ParallelIterator.html +#[must_use = "iterator adaptors are lazy and do nothing unless consumed"] +#[derive(Clone)] +pub struct MapInit<I: ParallelIterator, INIT, F> { + base: I, + init: INIT, + map_op: F, +} + +impl<I: ParallelIterator + Debug, INIT, F> Debug for MapInit<I, INIT, F> { + fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result { + f.debug_struct("MapInit").field("base", &self.base).finish() + } +} + +impl<I, INIT, F> MapInit<I, INIT, F> +where + I: ParallelIterator, +{ + /// Creates a new `MapInit` iterator. + pub(super) fn new(base: I, init: INIT, map_op: F) -> Self { + MapInit { base, init, map_op } + } +} + +impl<I, INIT, T, F, R> ParallelIterator for MapInit<I, INIT, F> +where + I: ParallelIterator, + INIT: Fn() -> T + Sync + Send, + F: Fn(&mut T, I::Item) -> R + Sync + Send, + R: Send, +{ + type Item = R; + + fn drive_unindexed<C>(self, consumer: C) -> C::Result + where + C: UnindexedConsumer<Self::Item>, + { + let consumer1 = MapInitConsumer::new(consumer, &self.init, &self.map_op); + self.base.drive_unindexed(consumer1) + } + + fn opt_len(&self) -> Option<usize> { + self.base.opt_len() + } +} + +impl<I, INIT, T, F, R> IndexedParallelIterator for MapInit<I, INIT, F> +where + I: IndexedParallelIterator, + INIT: Fn() -> T + Sync + Send, + F: Fn(&mut T, I::Item) -> R + Sync + Send, + R: Send, +{ + fn drive<C>(self, consumer: C) -> C::Result + where + C: Consumer<Self::Item>, + { + let consumer1 = MapInitConsumer::new(consumer, &self.init, &self.map_op); + self.base.drive(consumer1) + } + + fn len(&self) -> usize { + self.base.len() + } + + fn with_producer<CB>(self, callback: CB) -> CB::Output + where + CB: ProducerCallback<Self::Item>, + { + return self.base.with_producer(Callback { + callback, + init: self.init, + map_op: self.map_op, + }); + + struct Callback<CB, INIT, F> { + callback: CB, + init: INIT, + map_op: F, + } + + impl<T, INIT, U, F, R, CB> ProducerCallback<T> for Callback<CB, INIT, F> + where + CB: ProducerCallback<R>, + INIT: Fn() -> U + Sync, + F: Fn(&mut U, T) -> R + Sync, + R: Send, + { + type Output = CB::Output; + + fn callback<P>(self, base: P) -> CB::Output + where + P: Producer<Item = T>, + { + let producer = MapInitProducer { + base, + init: &self.init, + map_op: &self.map_op, + }; + self.callback.callback(producer) + } + } + } +} + +/// //////////////////////////////////////////////////////////////////////// + +struct MapInitProducer<'f, P, INIT, F> { + base: P, + init: &'f INIT, + map_op: &'f F, +} + +impl<'f, P, INIT, U, F, R> Producer for MapInitProducer<'f, P, INIT, F> +where + P: Producer, + INIT: Fn() -> U + Sync, + F: Fn(&mut U, P::Item) -> R + Sync, + R: Send, +{ + type Item = R; + type IntoIter = MapWithIter<'f, P::IntoIter, U, F>; + + fn into_iter(self) -> Self::IntoIter { + MapWithIter { + base: self.base.into_iter(), + item: (self.init)(), + map_op: self.map_op, + } + } + + fn min_len(&self) -> usize { + self.base.min_len() + } + fn max_len(&self) -> usize { + self.base.max_len() + } + + fn split_at(self, index: usize) -> (Self, Self) { + let (left, right) = self.base.split_at(index); + ( + MapInitProducer { + base: left, + init: self.init, + map_op: self.map_op, + }, + MapInitProducer { + base: right, + init: self.init, + map_op: self.map_op, + }, + ) + } + + fn fold_with<G>(self, folder: G) -> G + where + G: Folder<Self::Item>, + { + let folder1 = MapWithFolder { + base: folder, + item: (self.init)(), + map_op: self.map_op, + }; + self.base.fold_with(folder1).base + } +} + +/// //////////////////////////////////////////////////////////////////////// +/// Consumer implementation + +struct MapInitConsumer<'f, C, INIT, F> { + base: C, + init: &'f INIT, + map_op: &'f F, +} + +impl<'f, C, INIT, F> MapInitConsumer<'f, C, INIT, F> { + fn new(base: C, init: &'f INIT, map_op: &'f F) -> Self { + MapInitConsumer { base, init, map_op } + } +} + +impl<'f, T, INIT, U, R, C, F> Consumer<T> for MapInitConsumer<'f, C, INIT, F> +where + C: Consumer<R>, + INIT: Fn() -> U + Sync, + F: Fn(&mut U, T) -> R + Sync, + R: Send, +{ + type Folder = MapWithFolder<'f, C::Folder, U, F>; + type Reducer = C::Reducer; + type Result = C::Result; + + fn split_at(self, index: usize) -> (Self, Self, Self::Reducer) { + let (left, right, reducer) = self.base.split_at(index); + ( + MapInitConsumer::new(left, self.init, self.map_op), + MapInitConsumer::new(right, self.init, self.map_op), + reducer, + ) + } + + fn into_folder(self) -> Self::Folder { + MapWithFolder { + base: self.base.into_folder(), + item: (self.init)(), + map_op: self.map_op, + } + } + + fn full(&self) -> bool { + self.base.full() + } +} + +impl<'f, T, INIT, U, R, C, F> UnindexedConsumer<T> for MapInitConsumer<'f, C, INIT, F> +where + C: UnindexedConsumer<R>, + INIT: Fn() -> U + Sync, + F: Fn(&mut U, T) -> R + Sync, + R: Send, +{ + fn split_off_left(&self) -> Self { + MapInitConsumer::new(self.base.split_off_left(), self.init, self.map_op) + } + + fn to_reducer(&self) -> Self::Reducer { + self.base.to_reducer() + } +} |