| 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() |
| } |
| } |