/rust/registry/src/index.crates.io-1949cf8c6b5b557f/rayon-1.11.0/src/iter/enumerate.rs

Source
use super::plumbing::*;
use super::*;
use std::iter;
use std::ops::Range;

/// `Enumerate` is an iterator that returns the current count along with the element.
/// This struct is created by the [`enumerate()`] method on [`IndexedParallelIterator`]
///
/// [`enumerate()`]: IndexedParallelIterator::enumerate()
#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
#[derive(Debug, Clone)]
pub struct Enumerate<I> {
    base: I,
}

impl<I> Enumerate<I> {
    /// Creates a new `Enumerate` iterator.
    pub(super) fn new(base: I) -> Self {
        Enumerate { base }
    }
}

impl<I> ParallelIterator for Enumerate<I>
where
    I: IndexedParallelIterator,
{
    type Item = (usize, I::Item);

    fn drive_unindexed<C>(self, consumer: C) -> C::Result
    where
        C: UnindexedConsumer<Self::Item>,
    {
        bridge(self, consumer)
    }

    fn opt_len(&self) -> Option<usize> {
        Some(self.len())
    }
}

impl<I> IndexedParallelIterator for Enumerate<I>
where
    I: IndexedParallelIterator,
{
    fn drive<C: Consumer<Self::Item>>(self, consumer: C) -> C::Result {
        bridge(self, consumer)
    }

    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<I, CB> ProducerCallback<I> for Callback<CB>
        where
            CB: ProducerCallback<(usize, I)>,
        {
            type Output = CB::Output;
            fn callback<P>(self, base: P) -> CB::Output
            where
                P: Producer<Item = I>,
            {
                let producer = EnumerateProducer { base, offset: 0 };
                self.callback.callback(producer)
            }
        }
    }
}

// ////////////////////////////////////////////////////////////////////////
// Producer implementation

struct EnumerateProducer<P> {
    base: P,
    offset: usize,
}

impl<P> Producer for EnumerateProducer<P>
where
    P: Producer,
{
    type Item = (usize, P::Item);
    type IntoIter = iter::Zip<Range<usize>, P::IntoIter>;

    fn into_iter(self) -> Self::IntoIter {
        // Enumerate only works for IndexedParallelIterators. Since those
        // have a max length of usize::MAX, their max index is
        // usize::MAX - 1, so the range 0..usize::MAX includes all
        // possible indices.
        //
        // However, we should to use a precise end to the range, otherwise
        // reversing the iterator may have to walk back a long ways before
        // `Zip::next_back` can produce anything.
        let base = self.base.into_iter();
        let end = self.offset + base.len();
        (self.offset..end).zip(base)
    }

    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);
        (
            EnumerateProducer {
                base: left,
                offset: self.offset,
            },
            EnumerateProducer {
                base: right,
                offset: self.offset + index,
            },
        )
    }
}

Line	Count	Source
1		use super::plumbing::*;
2		use super::*;
3		use std::iter;
4		use std::ops::Range;
5
6		/// `Enumerate` is an iterator that returns the current count along with the element.
7		/// This struct is created by the [`enumerate()`] method on [`IndexedParallelIterator`]
8		///
9		/// [`enumerate()`]: IndexedParallelIterator::enumerate()
10		#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
11		#[derive(Debug, Clone)]
12		pub struct Enumerate<I> {
13		base: I,
14		}
15
16		impl<I> Enumerate<I> {
17		/// Creates a new `Enumerate` iterator.
18	0	pub(super) fn new(base: I) -> Self {
19	0	Enumerate { base }
20	0	} Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<rayon::slice::IterMut<rav1e::tiling::plane_region::PlaneRegionMut<u16>>>>::new Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<rayon::slice::IterMut<rav1e::tiling::plane_region::PlaneRegionMut<u8>>>>::new Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<_>>::new
21		}
22
23		impl<I> ParallelIterator for Enumerate<I>
24		where
25		I: IndexedParallelIterator,
26		{
27		type Item = (usize, I::Item);
28
29	0	fn drive_unindexed<C>(self, consumer: C) -> C::Result
30	0	where
31	0	C: UnindexedConsumer<Self::Item>,
32		{
33	0	bridge(self, consumer)
34	0	} Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<rayon::slice::IterMut<rav1e::tiling::plane_region::PlaneRegionMut<u16>>> as rayon::iter::ParallelIterator>::drive_unindexed::<rayon::iter::for_each::ForEachConsumer<rav1e::deblock::deblock_filter_frame<u16>::{closure#0}>> Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<rayon::slice::IterMut<rav1e::tiling::plane_region::PlaneRegionMut<u8>>> as rayon::iter::ParallelIterator>::drive_unindexed::<rayon::iter::for_each::ForEachConsumer<rav1e::deblock::deblock_filter_frame<u8>::{closure#0}>> Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<_> as rayon::iter::ParallelIterator>::drive_unindexed::<_>
35
36	0	fn opt_len(&self) -> Option<usize> {
37	0	Some(self.len())
38	0	}
39		}
40
41		impl<I> IndexedParallelIterator for Enumerate<I>
42		where
43		I: IndexedParallelIterator,
44		{
45	0	fn drive<C: Consumer<Self::Item>>(self, consumer: C) -> C::Result {
46	0	bridge(self, consumer)
47	0	}
48
49	0	fn len(&self) -> usize {
50	0	self.base.len()
51	0	} Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<rayon::slice::IterMut<rav1e::tiling::plane_region::PlaneRegionMut<u16>>> as rayon::iter::IndexedParallelIterator>::len Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<rayon::slice::IterMut<rav1e::tiling::plane_region::PlaneRegionMut<u8>>> as rayon::iter::IndexedParallelIterator>::len Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<_> as rayon::iter::IndexedParallelIterator>::len
52
53	0	fn with_producer<CB>(self, callback: CB) -> CB::Output
54	0	where
55	0	CB: ProducerCallback<Self::Item>,
56		{
57	0	return self.base.with_producer(Callback { callback });
58
59		struct Callback<CB> {
60		callback: CB,
61		}
62
63		impl<I, CB> ProducerCallback<I> for Callback<CB>
64		where
65		CB: ProducerCallback<(usize, I)>,
66		{
67		type Output = CB::Output;
68	0	fn callback<P>(self, base: P) -> CB::Output
69	0	where
70	0	P: Producer<Item = I>,
71		{
72	0	let producer = EnumerateProducer { base, offset: 0 };
73	0	self.callback.callback(producer)
74	0	} Unexecuted instantiation: <<rayon::iter::enumerate::Enumerate<_> as rayon::iter::IndexedParallelIterator>::with_producer::Callback<rayon::iter::plumbing::bridge::Callback<rayon::iter::for_each::ForEachConsumer<rav1e::deblock::deblock_filter_frame<u16>::{closure#0}>>> as rayon::iter::plumbing::ProducerCallback<&mut rav1e::tiling::plane_region::PlaneRegionMut<u16>>>::callback::<rayon::slice::IterMutProducer<rav1e::tiling::plane_region::PlaneRegionMut<u16>>> Unexecuted instantiation: <<rayon::iter::enumerate::Enumerate<_> as rayon::iter::IndexedParallelIterator>::with_producer::Callback<rayon::iter::plumbing::bridge::Callback<rayon::iter::for_each::ForEachConsumer<rav1e::deblock::deblock_filter_frame<u8>::{closure#0}>>> as rayon::iter::plumbing::ProducerCallback<&mut rav1e::tiling::plane_region::PlaneRegionMut<u8>>>::callback::<rayon::slice::IterMutProducer<rav1e::tiling::plane_region::PlaneRegionMut<u8>>> Unexecuted instantiation: <<rayon::iter::enumerate::Enumerate<_> as rayon::iter::IndexedParallelIterator>::with_producer::Callback<_> as rayon::iter::plumbing::ProducerCallback<_>>::callback::<_>
75		}
76	0	} Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<rayon::slice::IterMut<rav1e::tiling::plane_region::PlaneRegionMut<u16>>> as rayon::iter::IndexedParallelIterator>::with_producer::<rayon::iter::plumbing::bridge::Callback<rayon::iter::for_each::ForEachConsumer<rav1e::deblock::deblock_filter_frame<u16>::{closure#0}>>> Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<rayon::slice::IterMut<rav1e::tiling::plane_region::PlaneRegionMut<u8>>> as rayon::iter::IndexedParallelIterator>::with_producer::<rayon::iter::plumbing::bridge::Callback<rayon::iter::for_each::ForEachConsumer<rav1e::deblock::deblock_filter_frame<u8>::{closure#0}>>> Unexecuted instantiation: <rayon::iter::enumerate::Enumerate<_> as rayon::iter::IndexedParallelIterator>::with_producer::<_>
77		}
78
79		// ////////////////////////////////////////////////////////////////////////
80		// Producer implementation
81
82		struct EnumerateProducer<P> {
83		base: P,
84		offset: usize,
85		}
86
87		impl<P> Producer for EnumerateProducer<P>
88		where
89		P: Producer,
90		{
91		type Item = (usize, P::Item);
92		type IntoIter = iter::Zip<Range<usize>, P::IntoIter>;
93
94	0	fn into_iter(self) -> Self::IntoIter {
95		// Enumerate only works for IndexedParallelIterators. Since those
96		// have a max length of usize::MAX, their max index is
97		// usize::MAX - 1, so the range 0..usize::MAX includes all
98		// possible indices.
99		//
100		// However, we should to use a precise end to the range, otherwise
101		// reversing the iterator may have to walk back a long ways before
102		// `Zip::next_back` can produce anything.
103	0	let base = self.base.into_iter();
104	0	let end = self.offset + base.len();
105	0	(self.offset..end).zip(base)
106	0	} Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<rayon::slice::IterMutProducer<rav1e::tiling::plane_region::PlaneRegionMut<u16>>> as rayon::iter::plumbing::Producer>::into_iter Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<rayon::slice::IterMutProducer<rav1e::tiling::plane_region::PlaneRegionMut<u8>>> as rayon::iter::plumbing::Producer>::into_iter Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<_> as rayon::iter::plumbing::Producer>::into_iter
107
108	0	fn min_len(&self) -> usize {
109	0	self.base.min_len()
110	0	} Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<rayon::slice::IterMutProducer<rav1e::tiling::plane_region::PlaneRegionMut<u16>>> as rayon::iter::plumbing::Producer>::min_len Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<rayon::slice::IterMutProducer<rav1e::tiling::plane_region::PlaneRegionMut<u8>>> as rayon::iter::plumbing::Producer>::min_len Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<_> as rayon::iter::plumbing::Producer>::min_len
111	0	fn max_len(&self) -> usize {
112	0	self.base.max_len()
113	0	} Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<rayon::slice::IterMutProducer<rav1e::tiling::plane_region::PlaneRegionMut<u16>>> as rayon::iter::plumbing::Producer>::max_len Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<rayon::slice::IterMutProducer<rav1e::tiling::plane_region::PlaneRegionMut<u8>>> as rayon::iter::plumbing::Producer>::max_len Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<_> as rayon::iter::plumbing::Producer>::max_len
114
115	0	fn split_at(self, index: usize) -> (Self, Self) {
116	0	let (left, right) = self.base.split_at(index);
117	0	(
118	0	EnumerateProducer {
119	0	base: left,
120	0	offset: self.offset,
121	0	},
122	0	EnumerateProducer {
123	0	base: right,
124	0	offset: self.offset + index,
125	0	},
126	0	)
127	0	} Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<rayon::slice::IterMutProducer<rav1e::tiling::plane_region::PlaneRegionMut<u16>>> as rayon::iter::plumbing::Producer>::split_at Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<rayon::slice::IterMutProducer<rav1e::tiling::plane_region::PlaneRegionMut<u8>>> as rayon::iter::plumbing::Producer>::split_at Unexecuted instantiation: <rayon::iter::enumerate::EnumerateProducer<_> as rayon::iter::plumbing::Producer>::split_at
128		}

Coverage Report

Created: 2025-11-05 08:08