Struct differential_dataflow::trace::cursor::cursor_pair::CursorPair

pub struct CursorPair<C1, C2> { /* private fields */ }

A cursor over the combined updates of two different cursors.

A CursorPair wraps two cursors over the same types of updates, and provides navigation through their merged updates.

Trait Implementations

impl<K, V, T, R, C1, C2> Cursor<K, V, T, R> for CursorPair<C1, C2>where
    K: Ord,
    V: Ord,
    C1: Cursor<K, V, T, R>,
    C2: Cursor<K, V, T, R>,

type Storage = (<C1 as Cursor<K, V, T, R>>::Storage, <C2 as Cursor<K, V, T, R>>::Storage)

Type the cursor addresses data in.

fn key_valid(&self, storage: &Self::Storage) -> bool

Indicates if the current key is valid.

fn val_valid(&self, storage: &Self::Storage) -> bool

Indicates if the current value is valid.

fn key<'a>(&self, storage: &'a Self::Storage) -> &'a K

A reference to the current key. Asserts if invalid.

fn val<'a>(&self, storage: &'a Self::Storage) -> &'a V

A reference to the current value. Asserts if invalid.

fn map_times<L: FnMut(&T, R)>(&mut self, storage: &Self::Storage, logic: L)

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

fn step_key(&mut self, storage: &Self::Storage)

Advances the cursor to the next key. Indicates if the key is valid.

fn seek_key(&mut self, storage: &Self::Storage, key: &K)

Advances the cursor to the specified key. Indicates if the key is valid.

fn step_val(&mut self, storage: &Self::Storage)

Advances the cursor to the next value. Indicates if the value is valid.

fn seek_val(&mut self, storage: &Self::Storage, val: &V)

Advances the cursor to the specified value. Indicates if the value is valid.

fn rewind_keys(&mut self, storage: &Self::Storage)

Rewinds the cursor to the first key.

fn rewind_vals(&mut self, storage: &Self::Storage)

Rewinds the cursor to the first value for current key.

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

Returns a reference to the current key, if valid.

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

Returns a reference to the current value, if valid.