Trait Cursor

Source

pub(crate) trait Cursor<'a, T>: Send {
    // Required methods
    fn state(&self) -> &State<'a>;
    fn state_mut(&mut self) -> &mut State<'a>;
    fn count(&self) -> (usize, Option<usize>);
    fn fetch(&self) -> Option<T>;
    fn seek(&mut self);

    // Provided methods
    fn get(&self) -> Option<Result<T>> { ... }
    fn seek_and_get(&mut self) -> Option<Result<T>> { ... }
}

Expand description

Defines the polling operations shared by database cursor streams.

Implementations position a State, fetch one borrowed item, and surface RocksDB cursor errors. Borrowed items remain valid only until the next cursor movement and must be owned before they are retained.