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Diffstat (limited to 'vendor/rayon/src/iter/skip_any.rs')
-rw-r--r-- | vendor/rayon/src/iter/skip_any.rs | 144 |
1 files changed, 0 insertions, 144 deletions
diff --git a/vendor/rayon/src/iter/skip_any.rs b/vendor/rayon/src/iter/skip_any.rs deleted file mode 100644 index 0660a56..0000000 --- a/vendor/rayon/src/iter/skip_any.rs +++ /dev/null @@ -1,144 +0,0 @@ -use super::plumbing::*; -use super::*; -use std::sync::atomic::{AtomicUsize, Ordering}; - -/// `SkipAny` is an iterator that skips over `n` elements from anywhere in `I`. -/// This struct is created by the [`skip_any()`] method on [`ParallelIterator`] -/// -/// [`skip_any()`]: trait.ParallelIterator.html#method.skip_any -/// [`ParallelIterator`]: trait.ParallelIterator.html -#[must_use = "iterator adaptors are lazy and do nothing unless consumed"] -#[derive(Clone, Debug)] -pub struct SkipAny<I: ParallelIterator> { - base: I, - count: usize, -} - -impl<I> SkipAny<I> -where - I: ParallelIterator, -{ - /// Creates a new `SkipAny` iterator. - pub(super) fn new(base: I, count: usize) -> Self { - SkipAny { base, count } - } -} - -impl<I> ParallelIterator for SkipAny<I> -where - I: ParallelIterator, -{ - type Item = I::Item; - - fn drive_unindexed<C>(self, consumer: C) -> C::Result - where - C: UnindexedConsumer<Self::Item>, - { - let consumer1 = SkipAnyConsumer { - base: consumer, - count: &AtomicUsize::new(self.count), - }; - self.base.drive_unindexed(consumer1) - } -} - -/// //////////////////////////////////////////////////////////////////////// -/// Consumer implementation - -struct SkipAnyConsumer<'f, C> { - base: C, - count: &'f AtomicUsize, -} - -impl<'f, T, C> Consumer<T> for SkipAnyConsumer<'f, C> -where - C: Consumer<T>, - T: Send, -{ - type Folder = SkipAnyFolder<'f, 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); - ( - SkipAnyConsumer { base: left, ..self }, - SkipAnyConsumer { - base: right, - ..self - }, - reducer, - ) - } - - fn into_folder(self) -> Self::Folder { - SkipAnyFolder { - base: self.base.into_folder(), - count: self.count, - } - } - - fn full(&self) -> bool { - self.base.full() - } -} - -impl<'f, T, C> UnindexedConsumer<T> for SkipAnyConsumer<'f, C> -where - C: UnindexedConsumer<T>, - T: Send, -{ - fn split_off_left(&self) -> Self { - SkipAnyConsumer { - base: self.base.split_off_left(), - ..*self - } - } - - fn to_reducer(&self) -> Self::Reducer { - self.base.to_reducer() - } -} - -struct SkipAnyFolder<'f, C> { - base: C, - count: &'f AtomicUsize, -} - -fn checked_decrement(u: &AtomicUsize) -> bool { - u.fetch_update(Ordering::Relaxed, Ordering::Relaxed, |u| u.checked_sub(1)) - .is_ok() -} - -impl<'f, T, C> Folder<T> for SkipAnyFolder<'f, C> -where - C: Folder<T>, -{ - type Result = C::Result; - - fn consume(mut self, item: T) -> Self { - if !checked_decrement(self.count) { - self.base = self.base.consume(item); - } - self - } - - fn consume_iter<I>(mut self, iter: I) -> Self - where - I: IntoIterator<Item = T>, - { - self.base = self.base.consume_iter( - iter.into_iter() - .skip_while(move |_| checked_decrement(self.count)), - ); - self - } - - fn complete(self) -> C::Result { - self.base.complete() - } - - fn full(&self) -> bool { - self.base.full() - } -} |