Struct differential_dataflow::trace::implementations::ord::OrdValCursor

pub struct OrdValCursor<L: Layout>where
    <L::Target as Update>::Key: Sized + Clone,
    <L::Target as Update>::Val: Sized + Clone,{ /* private fields */ }

A cursor for navigating a single layer.

Trait Implementations

impl<L: Layout> Cursor for OrdValCursor<L>where <L::Target as Update>::Key: Sized + Clone, <L::Target as Update>::Val: Sized + Clone,

type Key = <<L as Layout>::Target as Update>::Key

Key by which updates are indexed.

type Val = <<L as Layout>::Target as Update>::Val

Values associated with keys.

type Time = <<L as Layout>::Target as Update>::Time

Timestamps associated with updates

type Diff = <<L as Layout>::Target as Update>::Diff

Associated update.

type Storage = OrdValBatch<L>

Storage required by the cursor.

fn key<'a>(&self, storage: &'a OrdValBatch<L>) -> &'a Self::Key

A reference to the current key. Asserts if invalid.

fn val<'a>(&self, storage: &'a OrdValBatch<L>) -> &'a Self::Val

A reference to the current value. Asserts if invalid.

fn map_times<L2: FnMut(&Self::Time, &Self::Diff)>( &mut self, storage: &OrdValBatch<L>, logic: L2 )

Applies logic to each pair of time and difference. Intended for mutation of the closure’s scope.

fn key_valid(&self, storage: &OrdValBatch<L>) -> bool

Indicates if the current key is valid.

fn val_valid(&self, storage: &OrdValBatch<L>) -> bool

Indicates if the current value is valid.

fn step_key(&mut self, storage: &OrdValBatch<L>)

Advances the cursor to the next key.

fn seek_key(&mut self, storage: &OrdValBatch<L>, key: &Self::Key)

Advances the cursor to the specified key.

fn step_val(&mut self, storage: &OrdValBatch<L>)

Advances the cursor to the next value.

fn seek_val(&mut self, storage: &OrdValBatch<L>, val: &Self::Val)

Advances the cursor to the specified value.

fn rewind_keys(&mut self, storage: &OrdValBatch<L>)

Rewinds the cursor to the first key.

fn rewind_vals(&mut self, storage: &OrdValBatch<L>)

Rewinds the cursor to the first value for current key.

fn get_key<'a>(&self, storage: &'a Self::Storage) -> Option<&'a Self::Key>

Returns a reference to the current key, if valid.

fn get_val<'a>(&self, storage: &'a Self::Storage) -> Option<&'a Self::Val>

Returns a reference to the current value, if valid.