From 1b6a04ca5504955c571d1c97504fb45ea0befee4 Mon Sep 17 00:00:00 2001 From: Valentin Popov Date: Mon, 8 Jan 2024 01:21:28 +0400 Subject: Initial vendor packages Signed-off-by: Valentin Popov --- vendor/rayon/src/option.rs | 203 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 203 insertions(+) create mode 100644 vendor/rayon/src/option.rs (limited to 'vendor/rayon/src/option.rs') diff --git a/vendor/rayon/src/option.rs b/vendor/rayon/src/option.rs new file mode 100644 index 0000000..0f56896 --- /dev/null +++ b/vendor/rayon/src/option.rs @@ -0,0 +1,203 @@ +//! Parallel iterator types for [options][std::option] +//! +//! You will rarely need to interact with this module directly unless you need +//! to name one of the iterator types. +//! +//! [std::option]: https://doc.rust-lang.org/stable/std/option/ + +use crate::iter::plumbing::*; +use crate::iter::*; +use std::sync::atomic::{AtomicBool, Ordering}; + +/// A parallel iterator over the value in [`Some`] variant of an [`Option`]. +/// +/// The iterator yields one value if the [`Option`] is a [`Some`], otherwise none. +/// +/// This `struct` is created by the [`into_par_iter`] function. +/// +/// [`Option`]: https://doc.rust-lang.org/std/option/enum.Option.html +/// [`Some`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.Some +/// [`into_par_iter`]: ../iter/trait.IntoParallelIterator.html#tymethod.into_par_iter +#[derive(Debug, Clone)] +pub struct IntoIter { + opt: Option, +} + +impl IntoParallelIterator for Option { + type Item = T; + type Iter = IntoIter; + + fn into_par_iter(self) -> Self::Iter { + IntoIter { opt: self } + } +} + +impl ParallelIterator for IntoIter { + type Item = T; + + fn drive_unindexed(self, consumer: C) -> C::Result + where + C: UnindexedConsumer, + { + self.drive(consumer) + } + + fn opt_len(&self) -> Option { + Some(self.len()) + } +} + +impl IndexedParallelIterator for IntoIter { + fn drive(self, consumer: C) -> C::Result + where + C: Consumer, + { + let mut folder = consumer.into_folder(); + if let Some(item) = self.opt { + folder = folder.consume(item); + } + folder.complete() + } + + fn len(&self) -> usize { + match self.opt { + Some(_) => 1, + None => 0, + } + } + + fn with_producer(self, callback: CB) -> CB::Output + where + CB: ProducerCallback, + { + callback.callback(OptionProducer { opt: self.opt }) + } +} + +/// A parallel iterator over a reference to the [`Some`] variant of an [`Option`]. +/// +/// The iterator yields one value if the [`Option`] is a [`Some`], otherwise none. +/// +/// This `struct` is created by the [`par_iter`] function. +/// +/// [`Option`]: https://doc.rust-lang.org/std/option/enum.Option.html +/// [`Some`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.Some +/// [`par_iter`]: ../iter/trait.IntoParallelRefIterator.html#tymethod.par_iter +#[derive(Debug)] +pub struct Iter<'a, T: Sync> { + inner: IntoIter<&'a T>, +} + +impl<'a, T: Sync> Clone for Iter<'a, T> { + fn clone(&self) -> Self { + Iter { + inner: self.inner.clone(), + } + } +} + +impl<'a, T: Sync> IntoParallelIterator for &'a Option { + type Item = &'a T; + type Iter = Iter<'a, T>; + + fn into_par_iter(self) -> Self::Iter { + Iter { + inner: self.as_ref().into_par_iter(), + } + } +} + +delegate_indexed_iterator! { + Iter<'a, T> => &'a T, + impl<'a, T: Sync + 'a> +} + +/// A parallel iterator over a mutable reference to the [`Some`] variant of an [`Option`]. +/// +/// The iterator yields one value if the [`Option`] is a [`Some`], otherwise none. +/// +/// This `struct` is created by the [`par_iter_mut`] function. +/// +/// [`Option`]: https://doc.rust-lang.org/std/option/enum.Option.html +/// [`Some`]: https://doc.rust-lang.org/std/option/enum.Option.html#variant.Some +/// [`par_iter_mut`]: ../iter/trait.IntoParallelRefMutIterator.html#tymethod.par_iter_mut +#[derive(Debug)] +pub struct IterMut<'a, T: Send> { + inner: IntoIter<&'a mut T>, +} + +impl<'a, T: Send> IntoParallelIterator for &'a mut Option { + type Item = &'a mut T; + type Iter = IterMut<'a, T>; + + fn into_par_iter(self) -> Self::Iter { + IterMut { + inner: self.as_mut().into_par_iter(), + } + } +} + +delegate_indexed_iterator! { + IterMut<'a, T> => &'a mut T, + impl<'a, T: Send + 'a> +} + +/// Private producer for an option +struct OptionProducer { + opt: Option, +} + +impl Producer for OptionProducer { + type Item = T; + type IntoIter = std::option::IntoIter; + + fn into_iter(self) -> Self::IntoIter { + self.opt.into_iter() + } + + fn split_at(self, index: usize) -> (Self, Self) { + debug_assert!(index <= 1); + let none = OptionProducer { opt: None }; + if index == 0 { + (none, self) + } else { + (self, none) + } + } +} + +/// Collect an arbitrary `Option`-wrapped collection. +/// +/// If any item is `None`, then all previous items collected are discarded, +/// and it returns only `None`. +impl FromParallelIterator> for Option +where + C: FromParallelIterator, + T: Send, +{ + fn from_par_iter(par_iter: I) -> Self + where + I: IntoParallelIterator>, + { + fn check(found_none: &AtomicBool) -> impl Fn(&Option) + '_ { + move |item| { + if item.is_none() { + found_none.store(true, Ordering::Relaxed); + } + } + } + + let found_none = AtomicBool::new(false); + let collection = par_iter + .into_par_iter() + .inspect(check(&found_none)) + .while_some() + .collect(); + + if found_none.load(Ordering::Relaxed) { + None + } else { + Some(collection) + } + } +} -- cgit v1.2.3