Enum shortcut::idx::Index

pub enum Index<T> {
    Range(Box<dyn RangeIndex<T> + Send + Sync>),
    Equality(Box<dyn EqualityIndex<T> + Send + Sync>),
}

A sum type expressing all different types of indices so they can easily be stored. Since all indices must at least implement EqualityIndex, this enum also forwards all calls of that trait to the underlying index for convenience.

Variants

Range(Box<dyn RangeIndex<T> + Send + Sync>)

A RangeIndex trait object.

Equality(Box<dyn EqualityIndex<T> + Send + Sync>)

An EqualityIndex trait object.

Trait Implementations

impl<T> EqualityIndex<T> for Index<T>

fn lookup<'a>(&'a self, key: &T) -> Box<dyn Iterator<Item = usize> + 'a>

Return an iterator that yields the indices of all rows that match the given value.

fn index(&mut self, key: T, row: usize)

Add the given row index to the index under the given value.

fn undex(&mut self, key: &T, row: usize)

Remove the given row index under the given value from the index.

fn estimate(&self) -> usize

Give the expected number of rows returned for a key. This method may be called often, and in rapid succession, and so should return quickly.

impl<T: Ord + Eq + 'static + Send + Sync> From<BTreeIndex<T>> for Index<T>

fn from(x: BTreeIndex<T>) -> Index<T>

Performs the conversion.

impl<T: Eq + Hash + 'static + Send + Sync> From<HashIndex<T>> for Index<T>

fn from(x: HashIndex<T>) -> Index<T>

Performs the conversion.