/rust/registry/src/index.crates.io-6f17d22bba15001f/rayon-1.10.0/src/iter/flatten.rs

Source (jump to first uncovered line)
use super::plumbing::*;
use super::*;

/// `Flatten` turns each element to a parallel iterator, then flattens these iterators
/// together. This struct is created by the [`flatten()`] method on [`ParallelIterator`].
///
/// [`flatten()`]: trait.ParallelIterator.html#method.flatten
/// [`ParallelIterator`]: trait.ParallelIterator.html
#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
#[derive(Debug, Clone)]
pub struct Flatten<I: ParallelIterator> {
    base: I,
}

impl<I> Flatten<I>
where
    I: ParallelIterator,
    I::Item: IntoParallelIterator,
{
    /// Creates a new `Flatten` iterator.
    pub(super) fn new(base: I) -> Self {
        Flatten { base }
    }
}

impl<I> ParallelIterator for Flatten<I>
where
    I: ParallelIterator,
    I::Item: IntoParallelIterator,
{
    type Item = <I::Item as IntoParallelIterator>::Item;

    fn drive_unindexed<C>(self, consumer: C) -> C::Result
    where
        C: UnindexedConsumer<Self::Item>,
    {
        let consumer = FlattenConsumer::new(consumer);
        self.base.drive_unindexed(consumer)
    }
}

/// ////////////////////////////////////////////////////////////////////////
/// Consumer implementation

struct FlattenConsumer<C> {
    base: C,
}

impl<C> FlattenConsumer<C> {
    fn new(base: C) -> Self {
        FlattenConsumer { base }
    }
}

impl<T, C> Consumer<T> for FlattenConsumer<C>
where
    C: UnindexedConsumer<T::Item>,
    T: IntoParallelIterator,
{
    type Folder = FlattenFolder<C, C::Result>;
    type Reducer = C::Reducer;
    type Result = C::Result;

    fn split_at(self, index: usize) -> (Self, Self, C::Reducer) {
        let (left, right, reducer) = self.base.split_at(index);
        (
            FlattenConsumer::new(left),
            FlattenConsumer::new(right),
            reducer,
        )
    }

    fn into_folder(self) -> Self::Folder {
        FlattenFolder {
            base: self.base,
            previous: None,
        }
    }

    fn full(&self) -> bool {
        self.base.full()
    }
}

impl<T, C> UnindexedConsumer<T> for FlattenConsumer<C>
where
    C: UnindexedConsumer<T::Item>,
    T: IntoParallelIterator,
{
    fn split_off_left(&self) -> Self {
        FlattenConsumer::new(self.base.split_off_left())
    }

    fn to_reducer(&self) -> Self::Reducer {
        self.base.to_reducer()
    }
}

struct FlattenFolder<C, R> {
    base: C,
    previous: Option<R>,
}

impl<T, C> Folder<T> for FlattenFolder<C, C::Result>
where
    C: UnindexedConsumer<T::Item>,
    T: IntoParallelIterator,
{
    type Result = C::Result;

    fn consume(self, item: T) -> Self {
        let par_iter = item.into_par_iter();
        let consumer = self.base.split_off_left();
        let result = par_iter.drive_unindexed(consumer);

        let previous = match self.previous {
            None => Some(result),
            Some(previous) => {
                let reducer = self.base.to_reducer();
                Some(reducer.reduce(previous, result))
            }
        };

        FlattenFolder {
            base: self.base,
            previous,
        }
    }

    fn complete(self) -> Self::Result {
        match self.previous {
            Some(previous) => previous,
            None => self.base.into_folder().complete(),
        }
    }

    fn full(&self) -> bool {
        self.base.full()
    }
}

Line	Count	Source (jump to first uncovered line)
1		use super::plumbing::*;
2		use super::*;
3
4		/// `Flatten` turns each element to a parallel iterator, then flattens these iterators
5		/// together. This struct is created by the [`flatten()`] method on [`ParallelIterator`].
6		///
7		/// [`flatten()`]: trait.ParallelIterator.html#method.flatten
8		/// [`ParallelIterator`]: trait.ParallelIterator.html
9		#[must_use = "iterator adaptors are lazy and do nothing unless consumed"]
10		#[derive(Debug, Clone)]
11		pub struct Flatten<I: ParallelIterator> {
12		base: I,
13		}
14
15		impl<I> Flatten<I>
16		where
17		I: ParallelIterator,
18		I::Item: IntoParallelIterator,
19		{
20		/// Creates a new `Flatten` iterator.
21	0	pub(super) fn new(base: I) -> Self {
22	0	Flatten { base }
23	0	} Unexecuted instantiation: <rayon::iter::flatten::Flatten<rayon::iter::map::Map<rayon::iter::par_bridge::IterBridge<std::fs::ReadDir>, sysinfo::unix::linux::process::refresh_procs::{closure#0}>>>::new Unexecuted instantiation: <rayon::iter::flatten::Flatten<_>>::new
24		}
25
26		impl<I> ParallelIterator for Flatten<I>
27		where
28		I: ParallelIterator,
29		I::Item: IntoParallelIterator,
30		{
31		type Item = <I::Item as IntoParallelIterator>::Item;
32
33	0	fn drive_unindexed<C>(self, consumer: C) -> C::Result
34	0	where
35	0	C: UnindexedConsumer<Self::Item>,
36	0	{
37	0	let consumer = FlattenConsumer::new(consumer);
38	0	self.base.drive_unindexed(consumer)
39	0	} Unexecuted instantiation: <rayon::iter::flatten::Flatten<rayon::iter::map::Map<rayon::iter::par_bridge::IterBridge<std::fs::ReadDir>, sysinfo::unix::linux::process::refresh_procs::{closure#0}>> as rayon::iter::ParallelIterator>::drive_unindexed::<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::collect::consumer::CollectConsumer<sysinfo::common::system::Process>, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>> Unexecuted instantiation: <rayon::iter::flatten::Flatten<rayon::iter::map::Map<rayon::iter::par_bridge::IterBridge<std::fs::ReadDir>, sysinfo::unix::linux::process::refresh_procs::{closure#0}>> as rayon::iter::ParallelIterator>::drive_unindexed::<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::extend::ListVecConsumer, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>> Unexecuted instantiation: <rayon::iter::flatten::Flatten<_> as rayon::iter::ParallelIterator>::drive_unindexed::<_>
40		}
41
42		/// ////////////////////////////////////////////////////////////////////////
43		/// Consumer implementation
44
45		struct FlattenConsumer<C> {
46		base: C,
47		}
48
49		impl<C> FlattenConsumer<C> {
50	0	fn new(base: C) -> Self {
51	0	FlattenConsumer { base }
52	0	} Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::collect::consumer::CollectConsumer<sysinfo::common::system::Process>, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>>>::new Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::extend::ListVecConsumer, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>>>::new Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<_>>::new
53		}
54
55		impl<T, C> Consumer<T> for FlattenConsumer<C>
56		where
57		C: UnindexedConsumer<T::Item>,
58		T: IntoParallelIterator,
59		{
60		type Folder = FlattenFolder<C, C::Result>;
61		type Reducer = C::Reducer;
62		type Result = C::Result;
63
64	0	fn split_at(self, index: usize) -> (Self, Self, C::Reducer) {
65	0	let (left, right, reducer) = self.base.split_at(index);
66	0	(
67	0	FlattenConsumer::new(left),
68	0	FlattenConsumer::new(right),
69	0	reducer,
70	0	)
71	0	}
72
73	0	fn into_folder(self) -> Self::Folder {
74	0	FlattenFolder {
75	0	base: self.base,
76	0	previous: None,
77	0	}
78	0	} Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::collect::consumer::CollectConsumer<sysinfo::common::system::Process>, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>> as rayon::iter::plumbing::Consumer<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::into_folder Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::extend::ListVecConsumer, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>> as rayon::iter::plumbing::Consumer<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::into_folder Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<_> as rayon::iter::plumbing::Consumer<_>>::into_folder
79
80	0	fn full(&self) -> bool {
81	0	self.base.full()
82	0	} Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::collect::consumer::CollectConsumer<sysinfo::common::system::Process>, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>> as rayon::iter::plumbing::Consumer<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::full Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::extend::ListVecConsumer, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>> as rayon::iter::plumbing::Consumer<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::full Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<_> as rayon::iter::plumbing::Consumer<_>>::full
83		}
84
85		impl<T, C> UnindexedConsumer<T> for FlattenConsumer<C>
86		where
87		C: UnindexedConsumer<T::Item>,
88		T: IntoParallelIterator,
89		{
90	0	fn split_off_left(&self) -> Self {
91	0	FlattenConsumer::new(self.base.split_off_left())
92	0	} Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::collect::consumer::CollectConsumer<sysinfo::common::system::Process>, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>> as rayon::iter::plumbing::UnindexedConsumer<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::split_off_left Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::extend::ListVecConsumer, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>> as rayon::iter::plumbing::UnindexedConsumer<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::split_off_left Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<_> as rayon::iter::plumbing::UnindexedConsumer<_>>::split_off_left
93
94	0	fn to_reducer(&self) -> Self::Reducer {
95	0	self.base.to_reducer()
96	0	} Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::collect::consumer::CollectConsumer<sysinfo::common::system::Process>, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>> as rayon::iter::plumbing::UnindexedConsumer<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::to_reducer Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::extend::ListVecConsumer, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>> as rayon::iter::plumbing::UnindexedConsumer<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::to_reducer Unexecuted instantiation: <rayon::iter::flatten::FlattenConsumer<_> as rayon::iter::plumbing::UnindexedConsumer<_>>::to_reducer
97		}
98
99		struct FlattenFolder<C, R> {
100		base: C,
101		previous: Option<R>,
102		}
103
104		impl<T, C> Folder<T> for FlattenFolder<C, C::Result>
105		where
106		C: UnindexedConsumer<T::Item>,
107		T: IntoParallelIterator,
108		{
109		type Result = C::Result;
110
111	0	fn consume(self, item: T) -> Self {
112	0	let par_iter = item.into_par_iter();
113	0	let consumer = self.base.split_off_left();
114	0	let result = par_iter.drive_unindexed(consumer);
115
116	0	let previous = match self.previous {
117	0	None => Some(result),
118	0	Some(previous) => {
119	0	let reducer = self.base.to_reducer();
120	0	Some(reducer.reduce(previous, result))
121		}
122		};
123
124	0	FlattenFolder {
125	0	base: self.base,
126	0	previous,
127	0	}
128	0	} Unexecuted instantiation: <rayon::iter::flatten::FlattenFolder<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::collect::consumer::CollectConsumer<sysinfo::common::system::Process>, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>, rayon::iter::collect::consumer::CollectResult<sysinfo::common::system::Process>> as rayon::iter::plumbing::Folder<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::consume Unexecuted instantiation: <rayon::iter::flatten::FlattenFolder<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::extend::ListVecConsumer, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>, alloc::collections::linked_list::LinkedList<alloc::vec::Vec<sysinfo::common::system::Process>>> as rayon::iter::plumbing::Folder<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::consume Unexecuted instantiation: <rayon::iter::flatten::FlattenFolder<_, <_ as rayon::iter::plumbing::Consumer<<_ as rayon::iter::IntoParallelIterator>::Item>>::Result> as rayon::iter::plumbing::Folder<_>>::consume
129
130	0	fn complete(self) -> Self::Result {
131	0	match self.previous {
132	0	Some(previous) => previous,
133	0	None => self.base.into_folder().complete(),
134		}
135	0	} Unexecuted instantiation: <rayon::iter::flatten::FlattenFolder<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::collect::consumer::CollectConsumer<sysinfo::common::system::Process>, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>, rayon::iter::collect::consumer::CollectResult<sysinfo::common::system::Process>> as rayon::iter::plumbing::Folder<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::complete Unexecuted instantiation: <rayon::iter::flatten::FlattenFolder<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::extend::ListVecConsumer, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>, alloc::collections::linked_list::LinkedList<alloc::vec::Vec<sysinfo::common::system::Process>>> as rayon::iter::plumbing::Folder<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::complete Unexecuted instantiation: <rayon::iter::flatten::FlattenFolder<_, <_ as rayon::iter::plumbing::Consumer<<_ as rayon::iter::IntoParallelIterator>::Item>>::Result> as rayon::iter::plumbing::Folder<_>>::complete
136
137	0	fn full(&self) -> bool {
138	0	self.base.full()
139	0	} Unexecuted instantiation: <rayon::iter::flatten::FlattenFolder<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::collect::consumer::CollectConsumer<sysinfo::common::system::Process>, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>, rayon::iter::collect::consumer::CollectResult<sysinfo::common::system::Process>> as rayon::iter::plumbing::Folder<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::full Unexecuted instantiation: <rayon::iter::flatten::FlattenFolder<rayon::iter::filter::FilterConsumer<rayon::iter::filter_map::FilterMapConsumer<rayon::iter::extend::ListVecConsumer, sysinfo::unix::linux::process::refresh_procs::{closure#2}>, sysinfo::unix::linux::process::refresh_procs::{closure#1}>, alloc::collections::linked_list::LinkedList<alloc::vec::Vec<sysinfo::common::system::Process>>> as rayon::iter::plumbing::Folder<alloc::vec::Vec<sysinfo::unix::linux::process::ProcAndTasks>>>::full Unexecuted instantiation: <rayon::iter::flatten::FlattenFolder<_, <_ as rayon::iter::plumbing::Consumer<<_ as rayon::iter::IntoParallelIterator>::Item>>::Result> as rayon::iter::plumbing::Folder<_>>::full
140		}

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Created: 2025-02-21 07:11