Struct Cursor 

pub struct Cursor { /* private fields */ }

Cursor position within the B+ tree. Stores the path from root to the current leaf.

Implementations

impl Cursor

pub fn seek( pages: &HashMap<PageId, Page>, root: PageId, key: &[u8], ) -> Result<Self>

Position the cursor at the first key >= key (seek). If key is empty, positions at the first entry in the tree.

pub fn first(pages: &HashMap<PageId, Page>, root: PageId) -> Result<Self>

Position the cursor at the first entry in the tree.

pub fn last(pages: &HashMap<PageId, Page>, root: PageId) -> Result<Self>

Position the cursor at the last entry in the tree.

pub fn is_valid(&self) -> bool

Whether the cursor is at a valid position.

pub fn current(&self, pages: &HashMap<PageId, Page>) -> Option<CursorEntry>

Get the current entry without advancing.

pub fn next(&mut self, pages: &HashMap<PageId, Page>) -> Result<bool>

Move the cursor to the next entry (forward).

pub fn prev(&mut self, pages: &HashMap<PageId, Page>) -> Result<bool>

Move the cursor to the previous entry (backward).