[−][src]Trait grouping_by::GroupingBy

pub trait GroupingBy {
    type GItem;
    fn grouping_by<K, F>(self, key: F) -> HashMap<K, Vec<Self::GItem>>
    where
        Self: Sized,
        F: Fn(&Self::GItem) -> K,
        K: Eq + Hash;

    fn grouping_by_as_set<K, F>(
        self, 
        key: F
    ) -> HashMap<K, HashSet<Self::GItem>>
    where
        Self: Sized,
        Self::GItem: Eq + Hash,
        F: Fn(&Self::GItem) -> K,
        K: Eq + Hash;
}

Associated Types

type GItem

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Required methods

fn grouping_by<K, F>(self, key: F) -> HashMap<K, Vec<Self::GItem>> where
    Self: Sized,
    F: Fn(&Self::GItem) -> K,
    K: Eq + Hash, 

Group by the key function given as parameter. The keys are the different values that the function can return, and the values are a Vec with the items of the iterator which has the key as property

fn grouping_by_as_set<K, F>(self, key: F) -> HashMap<K, HashSet<Self::GItem>> where
    Self: Sized,
    Self::GItem: Eq + Hash,
    F: Fn(&Self::GItem) -> K,
    K: Eq + Hash, 

Group by the key function given as parameter. The keys are the different values that the function can return, and the values are a HashSet with the items of the iterator which has the key as property

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Implementors

impl<T: Iterator> GroupingBy for T[src]

type GItem = <T as Iterator>::Item

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