Struct rayon::iter::flat_map::FlatMap

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pub struct FlatMap<I: ParallelIterator, F> {
    base: I,
    map_op: F,
}
Expand description

FlatMap maps each element to a parallel iterator, then flattens these iterators together. This struct is created by the flat_map() method on ParallelIterator

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§base: I§map_op: F

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impl<I: ParallelIterator, F> FlatMap<I, F>

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pub(super) fn new(base: I, map_op: F) -> Self

Creates a new FlatMap iterator.

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impl<I: Clone + ParallelIterator, F: Clone> Clone for FlatMap<I, F>

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fn clone(&self) -> FlatMap<I, F>

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<I: ParallelIterator + Debug, F> Debug for FlatMap<I, F>

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
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impl<I, F, PI> ParallelIterator for FlatMap<I, F>
where I: ParallelIterator, F: Fn(I::Item) -> PI + Sync + Send, PI: IntoParallelIterator,

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type Item = <PI as IntoParallelIterator>::Item

The type of item that this parallel iterator produces. For example, if you use the for_each method, this is the type of item that your closure will be invoked with.
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fn drive_unindexed<C>(self, consumer: C) -> C::Result
where C: UnindexedConsumer<Self::Item>,

Internal method used to define the behavior of this parallel iterator. You should not need to call this directly. Read more
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fn for_each<OP>(self, op: OP)
where OP: Fn(Self::Item) + Sync + Send,

Executes OP on each item produced by the iterator, in parallel. Read more
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fn for_each_with<OP, T>(self, init: T, op: OP)
where OP: Fn(&mut T, Self::Item) + Sync + Send, T: Send + Clone,

Executes OP on the given init value with each item produced by the iterator, in parallel. Read more
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fn for_each_init<OP, INIT, T>(self, init: INIT, op: OP)
where OP: Fn(&mut T, Self::Item) + Sync + Send, INIT: Fn() -> T + Sync + Send,

Executes OP on a value returned by init with each item produced by the iterator, in parallel. Read more
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fn try_for_each<OP, R>(self, op: OP) -> R
where OP: Fn(Self::Item) -> R + Sync + Send, R: Try<Output = ()> + Send,

Executes a fallible OP on each item produced by the iterator, in parallel. Read more
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fn try_for_each_with<OP, T, R>(self, init: T, op: OP) -> R
where OP: Fn(&mut T, Self::Item) -> R + Sync + Send, T: Send + Clone, R: Try<Output = ()> + Send,

Executes a fallible OP on the given init value with each item produced by the iterator, in parallel. Read more
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fn try_for_each_init<OP, INIT, T, R>(self, init: INIT, op: OP) -> R
where OP: Fn(&mut T, Self::Item) -> R + Sync + Send, INIT: Fn() -> T + Sync + Send, R: Try<Output = ()> + Send,

Executes a fallible OP on a value returned by init with each item produced by the iterator, in parallel. Read more
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fn count(self) -> usize

Counts the number of items in this parallel iterator. Read more
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fn map<F, R>(self, map_op: F) -> Map<Self, F>
where F: Fn(Self::Item) -> R + Sync + Send, R: Send,

Applies map_op to each item of this iterator, producing a new iterator with the results. Read more
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fn map_with<F, T, R>(self, init: T, map_op: F) -> MapWith<Self, T, F>
where F: Fn(&mut T, Self::Item) -> R + Sync + Send, T: Send + Clone, R: Send,

Applies map_op to the given init value with each item of this iterator, producing a new iterator with the results. Read more
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fn map_init<F, INIT, T, R>( self, init: INIT, map_op: F ) -> MapInit<Self, INIT, F>
where F: Fn(&mut T, Self::Item) -> R + Sync + Send, INIT: Fn() -> T + Sync + Send, R: Send,

Applies map_op to a value returned by init with each item of this iterator, producing a new iterator with the results. Read more
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fn cloned<'a, T>(self) -> Cloned<Self>
where T: 'a + Clone + Send, Self: ParallelIterator<Item = &'a T>,

Creates an iterator which clones all of its elements. This may be useful when you have an iterator over &T, but you need T, and that type implements Clone. See also copied(). Read more
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fn copied<'a, T>(self) -> Copied<Self>
where T: 'a + Copy + Send, Self: ParallelIterator<Item = &'a T>,

Creates an iterator which copies all of its elements. This may be useful when you have an iterator over &T, but you need T, and that type implements Copy. See also cloned(). Read more
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fn inspect<OP>(self, inspect_op: OP) -> Inspect<Self, OP>
where OP: Fn(&Self::Item) + Sync + Send,

Applies inspect_op to a reference to each item of this iterator, producing a new iterator passing through the original items. This is often useful for debugging to see what’s happening in iterator stages. Read more
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fn update<F>(self, update_op: F) -> Update<Self, F>
where F: Fn(&mut Self::Item) + Sync + Send,

Mutates each item of this iterator before yielding it. Read more
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fn filter<P>(self, filter_op: P) -> Filter<Self, P>
where P: Fn(&Self::Item) -> bool + Sync + Send,

Applies filter_op to each item of this iterator, producing a new iterator with only the items that gave true results. Read more
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fn filter_map<P, R>(self, filter_op: P) -> FilterMap<Self, P>
where P: Fn(Self::Item) -> Option<R> + Sync + Send, R: Send,

Applies filter_op to each item of this iterator to get an Option, producing a new iterator with only the items from Some results. Read more
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fn flat_map<F, PI>(self, map_op: F) -> FlatMap<Self, F>
where F: Fn(Self::Item) -> PI + Sync + Send, PI: IntoParallelIterator,

Applies map_op to each item of this iterator to get nested parallel iterators, producing a new parallel iterator that flattens these back into one. Read more
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fn flat_map_iter<F, SI>(self, map_op: F) -> FlatMapIter<Self, F>
where F: Fn(Self::Item) -> SI + Sync + Send, SI: IntoIterator, SI::Item: Send,

Applies map_op to each item of this iterator to get nested serial iterators, producing a new parallel iterator that flattens these back into one. Read more
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fn reduce<OP, ID>(self, identity: ID, op: OP) -> Self::Item
where OP: Fn(Self::Item, Self::Item) -> Self::Item + Sync + Send, ID: Fn() -> Self::Item + Sync + Send,

Reduces the items in the iterator into one item using op. The argument identity should be a closure that can produce “identity” value which may be inserted into the sequence as needed to create opportunities for parallel execution. So, for example, if you are doing a summation, then identity() ought to produce something that represents the zero for your type (but consider just calling sum() in that case). Read more
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fn reduce_with<OP>(self, op: OP) -> Option<Self::Item>
where OP: Fn(Self::Item, Self::Item) -> Self::Item + Sync + Send,

Reduces the items in the iterator into one item using op. If the iterator is empty, None is returned; otherwise, Some is returned. Read more
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fn fold<T, ID, F>(self, identity: ID, fold_op: F) -> Fold<Self, ID, F>
where F: Fn(T, Self::Item) -> T + Sync + Send, ID: Fn() -> T + Sync + Send, T: Send,

Parallel fold is similar to sequential fold except that the sequence of items may be subdivided before it is folded. Consider a list of numbers like 22 3 77 89 46. If you used sequential fold to add them (fold(0, |a,b| a+b), you would wind up first adding 0 + 22, then 22 + 3, then 25 + 77, and so forth. The parallel fold works similarly except that it first breaks up your list into sublists, and hence instead of yielding up a single sum at the end, it yields up multiple sums. The number of results is nondeterministic, as is the point where the breaks occur. Read more
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fn fold_with<F, T>(self, init: T, fold_op: F) -> FoldWith<Self, T, F>
where F: Fn(T, Self::Item) -> T + Sync + Send, T: Send + Clone,

Applies fold_op to the given init value with each item of this iterator, finally producing the value for further use. Read more
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fn try_fold<T, R, ID, F>( self, identity: ID, fold_op: F ) -> TryFold<Self, R, ID, F>
where F: Fn(T, Self::Item) -> R + Sync + Send, ID: Fn() -> T + Sync + Send, R: Try<Output = T> + Send,

Performs a fallible parallel fold. Read more
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fn try_fold_with<F, T, R>(self, init: T, fold_op: F) -> TryFoldWith<Self, R, F>
where F: Fn(T, Self::Item) -> R + Sync + Send, R: Try<Output = T> + Send, T: Clone + Send,

Performs a fallible parallel fold with a cloneable init value. Read more
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fn sum<S>(self) -> S
where S: Send + Sum<Self::Item> + Sum<S>,

Sums up the items in the iterator. Read more
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fn product<P>(self) -> P
where P: Send + Product<Self::Item> + Product<P>,

Multiplies all the items in the iterator. Read more
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fn min_by<F>(self, f: F) -> Option<Self::Item>
where F: Sync + Send + Fn(&Self::Item, &Self::Item) -> Ordering,

Computes the minimum of all the items in the iterator with respect to the given comparison function. If the iterator is empty, None is returned; otherwise, Some(min) is returned. Read more
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fn min_by_key<K, F>(self, f: F) -> Option<Self::Item>
where K: Ord + Send, F: Sync + Send + Fn(&Self::Item) -> K,

Computes the item that yields the minimum value for the given function. If the iterator is empty, None is returned; otherwise, Some(item) is returned. Read more
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fn max_by<F>(self, f: F) -> Option<Self::Item>
where F: Sync + Send + Fn(&Self::Item, &Self::Item) -> Ordering,

Computes the maximum of all the items in the iterator with respect to the given comparison function. If the iterator is empty, None is returned; otherwise, Some(max) is returned. Read more
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fn max_by_key<K, F>(self, f: F) -> Option<Self::Item>
where K: Ord + Send, F: Sync + Send + Fn(&Self::Item) -> K,

Computes the item that yields the maximum value for the given function. If the iterator is empty, None is returned; otherwise, Some(item) is returned. Read more
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fn chain<C>(self, chain: C) -> Chain<Self, C::Iter>
where C: IntoParallelIterator<Item = Self::Item>,

Takes two iterators and creates a new iterator over both. Read more
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fn find_any<P>(self, predicate: P) -> Option<Self::Item>
where P: Fn(&Self::Item) -> bool + Sync + Send,

Searches for some item in the parallel iterator that matches the given predicate and returns it. This operation is similar to find on sequential iterators but the item returned may not be the first one in the parallel sequence which matches, since we search the entire sequence in parallel. Read more
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fn find_first<P>(self, predicate: P) -> Option<Self::Item>
where P: Fn(&Self::Item) -> bool + Sync + Send,

Searches for the sequentially first item in the parallel iterator that matches the given predicate and returns it. Read more
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fn find_last<P>(self, predicate: P) -> Option<Self::Item>
where P: Fn(&Self::Item) -> bool + Sync + Send,

Searches for the sequentially last item in the parallel iterator that matches the given predicate and returns it. Read more
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fn find_map_any<P, R>(self, predicate: P) -> Option<R>
where P: Fn(Self::Item) -> Option<R> + Sync + Send, R: Send,

Applies the given predicate to the items in the parallel iterator and returns any non-None result of the map operation. Read more
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fn find_map_first<P, R>(self, predicate: P) -> Option<R>
where P: Fn(Self::Item) -> Option<R> + Sync + Send, R: Send,

Applies the given predicate to the items in the parallel iterator and returns the sequentially first non-None result of the map operation. Read more
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fn find_map_last<P, R>(self, predicate: P) -> Option<R>
where P: Fn(Self::Item) -> Option<R> + Sync + Send, R: Send,

Applies the given predicate to the items in the parallel iterator and returns the sequentially last non-None result of the map operation. Read more
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fn any<P>(self, predicate: P) -> bool
where P: Fn(Self::Item) -> bool + Sync + Send,

Searches for some item in the parallel iterator that matches the given predicate, and if so returns true. Once a match is found, we’ll attempt to stop process the rest of the items. Proving that there’s no match, returning false, does require visiting every item. Read more
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fn all<P>(self, predicate: P) -> bool
where P: Fn(Self::Item) -> bool + Sync + Send,

Tests that every item in the parallel iterator matches the given predicate, and if so returns true. If a counter-example is found, we’ll attempt to stop processing more items, then return false. Read more
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fn while_some<T>(self) -> WhileSome<Self>
where Self: ParallelIterator<Item = Option<T>>, T: Send,

Creates an iterator over the Some items of this iterator, halting as soon as any None is found. Read more
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fn panic_fuse(self) -> PanicFuse<Self>

Wraps an iterator with a fuse in case of panics, to halt all threads as soon as possible. Read more
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fn collect<C>(self) -> C
where C: FromParallelIterator<Self::Item>,

Creates a fresh collection containing all the elements produced by this parallel iterator. Read more
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fn unzip<A, B, FromA, FromB>(self) -> (FromA, FromB)
where Self: ParallelIterator<Item = (A, B)>, FromA: Default + Send + ParallelExtend<A>, FromB: Default + Send + ParallelExtend<B>, A: Send, B: Send,

Unzips the items of a parallel iterator into a pair of arbitrary ParallelExtend containers. Read more
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fn partition<A, B, P>(self, predicate: P) -> (A, B)
where A: Default + Send + ParallelExtend<Self::Item>, B: Default + Send + ParallelExtend<Self::Item>, P: Fn(&Self::Item) -> bool + Sync + Send,

Partitions the items of a parallel iterator into a pair of arbitrary ParallelExtend containers. Items for which the predicate returns true go into the first container, and the rest go into the second. Read more
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fn partition_map<A, B, P, L, R>(self, predicate: P) -> (A, B)
where A: Default + Send + ParallelExtend<L>, B: Default + Send + ParallelExtend<R>, P: Fn(Self::Item) -> Either<L, R> + Sync + Send, L: Send, R: Send,

Partitions and maps the items of a parallel iterator into a pair of arbitrary ParallelExtend containers. Either::Left items go into the first container, and Either::Right items go into the second. Read more
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fn take_any(self, n: usize) -> TakeAny<Self>

Creates an iterator that yields n elements from anywhere in the original iterator. Read more
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fn skip_any(self, n: usize) -> SkipAny<Self>

Creates an iterator that skips n elements from anywhere in the original iterator. Read more
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fn take_any_while<P>(self, predicate: P) -> TakeAnyWhile<Self, P>
where P: Fn(&Self::Item) -> bool + Sync + Send,

Creates an iterator that takes elements from anywhere in the original iterator until the given predicate returns false. Read more
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fn skip_any_while<P>(self, predicate: P) -> SkipAnyWhile<Self, P>
where P: Fn(&Self::Item) -> bool + Sync + Send,

Creates an iterator that skips elements from anywhere in the original iterator until the given predicate returns false. Read more
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fn collect_vec_list(self) -> LinkedList<Vec<Self::Item>>

Collects this iterator into a linked list of vectors. Read more
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fn opt_len(&self) -> Option<usize>

Internal method used to define the behavior of this parallel iterator. You should not need to call this directly. Read more

Auto Trait Implementations§

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impl<I, F> Freeze for FlatMap<I, F>
where F: Freeze, I: Freeze,

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impl<I, F> RefUnwindSafe for FlatMap<I, F>

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impl<I, F> Send for FlatMap<I, F>
where F: Send,

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impl<I, F> Sync for FlatMap<I, F>
where F: Sync, I: Sync,

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impl<I, F> Unpin for FlatMap<I, F>
where F: Unpin, I: Unpin,

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impl<I, F> UnwindSafe for FlatMap<I, F>
where F: UnwindSafe, I: UnwindSafe,

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> IntoParallelIterator for T

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type Iter = T

The parallel iterator type that will be created.
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type Item = <T as ParallelIterator>::Item

The type of item that the parallel iterator will produce.
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fn into_par_iter(self) -> T

Converts self into a parallel iterator. Read more
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impl<T> Pointable for T

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const ALIGN: usize = _

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.