Struct itertools::structs::GroupBy

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pub struct GroupBy<K, I, F>
where I: Iterator,
{ /* private fields */ }
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.

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> !Freeze for GroupBy<K, I, F>

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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>

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, 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.