pub struct GroupBy<K, I, F>where
    I: Iterator,{
    inner: RefCell<GroupInner<K, I, F>>,
    index: Cell<usize>,
}
Expand description

GroupBy is the storage for the lazy grouping operation.

If the groups are consumed in their original order, or if each group is dropped without keeping it around, then GroupBy uses no allocations. It needs allocations only if several group iterators are alive at the same time.

This type implements IntoIterator (it is not an iterator itself), because the group iterators need to borrow from this value. It should be stored in a local variable or temporary and iterated.

See .group_by() for more information.

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§inner: RefCell<GroupInner<K, I, F>>§index: Cell<usize>

Implementations§

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impl<K, I, F> GroupBy<K, I, F>where I: Iterator,

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fn step(&self, client: usize) -> Option<I::Item>where F: FnMut(&I::Item) -> K, K: PartialEq,

client: Index of group that requests next element

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fn drop_group(&self, client: usize)

client: Index of group

Trait Implementations§

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impl<'a, K, I, F> IntoIterator for &'a GroupBy<K, I, F>where I: Iterator, I::Item: 'a, F: FnMut(&I::Item) -> K, K: PartialEq,

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type Item = (K, Group<'a, K, I, F>)

The type of the elements being iterated over.
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type IntoIter = Groups<'a, K, I, F>

Which kind of iterator are we turning this into?
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fn into_iter(self) -> Self::IntoIter

Creates an iterator from a value. Read more

Auto Trait Implementations§

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impl<K, I, F> !RefUnwindSafe for GroupBy<K, I, F>

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impl<K, I, F> Send for GroupBy<K, I, F>where F: Send, I: Send, K: Send, <I as Iterator>::Item: Send,

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impl<K, I, F> !Sync for GroupBy<K, I, F>

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impl<K, I, F> Unpin for GroupBy<K, I, F>where F: Unpin, I: Unpin, K: Unpin, <I as Iterator>::Item: Unpin,

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impl<K, I, F> UnwindSafe for GroupBy<K, I, F>where F: UnwindSafe, I: UnwindSafe, K: UnwindSafe, <I as Iterator>::Item: UnwindSafe + RefUnwindSafe,

Blanket Implementations§

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impl<T> Any for Twhere 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 Twhere 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 Twhere 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 Twhere 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, U> TryFrom<U> for Twhere 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 Twhere 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.