Struct WriteCallback 

pub struct WriteCallback { /* private fields */ }

Handle to a registered write callback. Drop to unregister.

Returned by Database::on_write. While this value is alive the callback fires on writes; dropping it removes the registration. Use detach to keep the callback registered for the life of the Instance when you don’t want to manage the lifetime yourself.

Holds a weak reference to the Instance, so a WriteCallback will not keep the Instance alive on its own.

Implementations

impl WriteCallback

pub fn detach(self)

Consume the handle without unregistering. The callback remains active for the life of the Instance.

Implementation note: this sets a flag rather than calling mem::forget so that field destructors (the WeakInstance’s weak count, the tree_id’s heap allocation) still run — only our Drop impl is short-circuited.

Trait Implementations

impl Debug for WriteCallback

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

Formats the value using the given formatter.

impl Drop for WriteCallback

fn drop(&mut self)

Executes the destructor for this type.