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Diffstat (limited to 'vendor/rayon/src/iter/copied.rs')
| -rw-r--r-- | vendor/rayon/src/iter/copied.rs | 223 |
1 files changed, 223 insertions, 0 deletions
diff --git a/vendor/rayon/src/iter/copied.rs b/vendor/rayon/src/iter/copied.rs new file mode 100644 index 0000000..12c9c5b --- /dev/null +++ b/vendor/rayon/src/iter/copied.rs @@ -0,0 +1,223 @@ +use super::plumbing::*; +use super::*; + +use std::iter; + +/// `Copied` is an iterator that copies the elements of an underlying iterator. +/// +/// This struct is created by the [`copied()`] method on [`ParallelIterator`] +/// +/// [`copied()`]: trait.ParallelIterator.html#method.copied +/// [`ParallelIterator`]: trait.ParallelIterator.html +#[must_use = "iterator adaptors are lazy and do nothing unless consumed"] +#[derive(Debug, Clone)] +pub struct Copied<I: ParallelIterator> { + base: I, +} + +impl<I> Copied<I> +where + I: ParallelIterator, +{ + /// Creates a new `Copied` iterator. + pub(super) fn new(base: I) -> Self { + Copied { base } + } +} + +impl<'a, T, I> ParallelIterator for Copied<I> +where + I: ParallelIterator<Item = &'a T>, + T: 'a + Copy + Send + Sync, +{ + type Item = T; + + fn drive_unindexed<C>(self, consumer: C) -> C::Result + where + C: UnindexedConsumer<Self::Item>, + { + let consumer1 = CopiedConsumer::new(consumer); + self.base.drive_unindexed(consumer1) + } + + fn opt_len(&self) -> Option<usize> { + self.base.opt_len() + } +} + +impl<'a, T, I> IndexedParallelIterator for Copied<I> +where + I: IndexedParallelIterator<Item = &'a T>, + T: 'a + Copy + Send + Sync, +{ + fn drive<C>(self, consumer: C) -> C::Result + where + C: Consumer<Self::Item>, + { + let consumer1 = CopiedConsumer::new(consumer); + 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 }); + + struct Callback<CB> { + callback: CB, + } + + impl<'a, T, CB> ProducerCallback<&'a T> for Callback<CB> + where + CB: ProducerCallback<T>, + T: 'a + Copy + Send, + { + type Output = CB::Output; + + fn callback<P>(self, base: P) -> CB::Output + where + P: Producer<Item = &'a T>, + { + let producer = CopiedProducer { base }; + self.callback.callback(producer) + } + } + } +} + +/// //////////////////////////////////////////////////////////////////////// + +struct CopiedProducer<P> { + base: P, +} + +impl<'a, T, P> Producer for CopiedProducer<P> +where + P: Producer<Item = &'a T>, + T: 'a + Copy, +{ + type Item = T; + type IntoIter = iter::Copied<P::IntoIter>; + + fn into_iter(self) -> Self::IntoIter { + self.base.into_iter().copied() + } + + 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); + ( + CopiedProducer { base: left }, + CopiedProducer { base: right }, + ) + } + + fn fold_with<F>(self, folder: F) -> F + where + F: Folder<Self::Item>, + { + self.base.fold_with(CopiedFolder { base: folder }).base + } +} + +/// //////////////////////////////////////////////////////////////////////// +/// Consumer implementation + +struct CopiedConsumer<C> { + base: C, +} + +impl<C> CopiedConsumer<C> { + fn new(base: C) -> Self { + CopiedConsumer { base } + } +} + +impl<'a, T, C> Consumer<&'a T> for CopiedConsumer<C> +where + C: Consumer<T>, + T: 'a + Copy, +{ + type Folder = CopiedFolder<C::Folder>; + 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); + ( + CopiedConsumer::new(left), + CopiedConsumer::new(right), + reducer, + ) + } + + fn into_folder(self) -> Self::Folder { + CopiedFolder { + base: self.base.into_folder(), + } + } + + fn full(&self) -> bool { + self.base.full() + } +} + +impl<'a, T, C> UnindexedConsumer<&'a T> for CopiedConsumer<C> +where + C: UnindexedConsumer<T>, + T: 'a + Copy, +{ + fn split_off_left(&self) -> Self { + CopiedConsumer::new(self.base.split_off_left()) + } + + fn to_reducer(&self) -> Self::Reducer { + self.base.to_reducer() + } +} + +struct CopiedFolder<F> { + base: F, +} + +impl<'a, T, F> Folder<&'a T> for CopiedFolder<F> +where + F: Folder<T>, + T: 'a + Copy, +{ + type Result = F::Result; + + fn consume(self, &item: &'a T) -> Self { + CopiedFolder { + base: self.base.consume(item), + } + } + + fn consume_iter<I>(mut self, iter: I) -> Self + where + I: IntoIterator<Item = &'a T>, + { + self.base = self.base.consume_iter(iter.into_iter().copied()); + self + } + + fn complete(self) -> F::Result { + self.base.complete() + } + + fn full(&self) -> bool { + self.base.full() + } +} |