Struct rayon::collections::drain_guard::DrainGuard

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pub(super) struct DrainGuard<'a, T, C: From<Vec<T>>> {
    collection: &'a mut C,
    vec: Vec<T>,
}
Expand description

A proxy for draining a collection by converting to a Vec and back.

This is used for draining BinaryHeap and VecDeque, which both have zero-allocation conversions to/from Vec, though not zero-cost:

  • BinaryHeap will heapify from Vec, but at least that will be empty.
  • VecDeque has to shift items to offset 0 when converting to Vec.

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§collection: &'a mut C§vec: Vec<T>

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impl<'a, T, C> DrainGuard<'a, T, C>
where C: Default + From<Vec<T>>, Vec<T>: From<C>,

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pub(super) fn new(collection: &'a mut C) -> Self

Trait Implementations§

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impl<'a, T, C: From<Vec<T>>> Drop for DrainGuard<'a, T, C>

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fn drop(&mut self)

Executes the destructor for this type. Read more
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impl<'a, T, C> ParallelDrainRange for &'a mut DrainGuard<'_, T, C>
where T: Send, C: From<Vec<T>>,

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type Iter = Drain<'a, T>

The draining parallel iterator type that will be created.
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type Item = T

The type of item that the parallel iterator will produce. This is usually the same as IntoParallelIterator::Item.
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fn par_drain<R: RangeBounds<usize>>(self, range: R) -> Self::Iter

Returns a draining parallel iterator over a range of the collection. Read more

Auto Trait Implementations§

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impl<'a, T, C> Freeze for DrainGuard<'a, T, C>

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impl<'a, T, C> RefUnwindSafe for DrainGuard<'a, T, C>

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impl<'a, T, C> Send for DrainGuard<'a, T, C>
where C: Send, T: Send,

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impl<'a, T, C> Sync for DrainGuard<'a, T, C>
where C: Sync, T: Sync,

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impl<'a, T, C> Unpin for DrainGuard<'a, T, C>
where T: Unpin,

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impl<'a, T, C> !UnwindSafe for DrainGuard<'a, T, C>

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> 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, 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.