[][src]Struct itertools::structs::GroupBy

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

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

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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The type of the elements being iterated over.

Which kind of iterator are we turning this into?

Creates an iterator from a value. Read more

Auto Trait Implementations

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

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

Blanket Implementations

impl<T> From for T
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Performs the conversion.

impl<T, U> Into for T where
    U: From<T>, 
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Performs the conversion.

impl<T, U> TryFrom for T where
    T: From<U>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> Borrow for T where
    T: ?Sized
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Important traits for &'a mut R

Immutably borrows from an owned value. Read more

impl<T, U> TryInto for T where
    U: TryFrom<T>, 
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🔬 This is a nightly-only experimental API. (try_from)

The type returned in the event of a conversion error.

🔬 This is a nightly-only experimental API. (try_from)

Performs the conversion.

impl<T> BorrowMut for T where
    T: ?Sized
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Important traits for &'a mut R

Mutably borrows from an owned value. Read more

impl<T> Any for T where
    T: 'static + ?Sized
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🔬 This is a nightly-only experimental API. (get_type_id)

this method will likely be replaced by an associated static

Gets the TypeId of self. Read more