Struct BTreeCursor 

pub struct BTreeCursor { /* private fields */ }

A forward-or-reverse ordered cursor over a BTree. No lifetime parameter (the OQ-1 result): it OWNS Rc<BNode> clones along the spine + the root snapshot, so it borrows nothing externally; the only borrow is the one next_row lends out of self per call. Holding the _snapshot root Arc keeps the entire pre-write tree alive and immutable for the cursor’s life — a concurrent BTree::add/delete make_muts a fresh path (because the snapshot pins strong_count > 1) and never touches these nodes. That is what makes reentrant fetch-during-push safe (§6, foundations §6.3).

Trait Implementations

impl RowStream for BTreeCursor

type Row<'a> = &'a OwnedRow

fn next_row(&mut self) -> Option<Self::Row<'_>>