Struct ChildReference 

pub struct ChildReference {
    pub key: Vec<u8>,
    pub lsn: Lsn,
    pub state: SlotState,
}

A reference in the tree from parent to child.

Contains a key, LSN (on-disk location), and state byte for tracking deletion and dirty status. This structure is used primarily for the tree root reference, though in it’s also used within IN slot arrays.

In the Noxu DB Rust port, individual IN/BIN slot storage is separate from ChildReference, but the concepts are similar.

Fields

key: Vec<u8>

The key identifying this child in the parent’s key range.

lsn: Lsn

The LSN of the child node on disk, or NULL_LSN if not yet logged.

state: SlotState

State flags for this reference (dirty, known-deleted, etc.).

Implementations

impl ChildReference

pub fn new(key: Vec<u8>, lsn: Lsn, state: SlotState) -> Self

Creates a new ChildReference.

Arguments

• key - The key identifying this child
• lsn - The LSN of the child node on disk
• state - Initial state flags

pub fn new_with_key_and_lsn(key: Vec<u8>, lsn: Lsn) -> Self

Creates a new ChildReference with empty state.

Arguments

• key - The key identifying this child
• lsn - The LSN of the child node on disk

pub fn is_known_deleted(&self) -> bool

Returns true if the known-deleted flag is set.

pub fn set_known_deleted(&mut self)

Sets the known-deleted flag.

pub fn clear_known_deleted(&mut self)

Clears the known-deleted flag.

pub fn is_pending_deleted(&self) -> bool

Returns true if the pending-deleted flag is set.

pub fn set_pending_deleted(&mut self)

Sets the pending-deleted flag.

pub fn clear_pending_deleted(&mut self)

Clears the pending-deleted flag.

pub fn is_dirty(&self) -> bool

Returns true if the dirty flag is set.

pub fn set_dirty(&mut self)

Sets the dirty flag.

pub fn clear_dirty(&mut self)

Clears the dirty flag.

pub fn is_embedded_ln(&self) -> bool

Returns true if the embedded-LN flag is set.

pub fn set_embedded_ln(&mut self)

Sets the embedded-LN flag.

pub fn clear_transient_bits(&mut self)

Clears all transient state bits (not persisted to disk).

Trait Implementations

impl Clone for ChildReference

fn clone(&self) -> ChildReference

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ChildReference

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ChildReference

fn default() -> Self

Returns the “default value” for a type.