Struct ExtensionStore 

pub struct ExtensionStore { /* private fields */ }

Cold, typed metadata owned by a structure snapshot.

Keys are stable schema identifiers. Values are immutable and reference counted, so cloning a structure does not copy domain metadata.

Implementations

impl ExtensionStore

pub const fn new() -> Self

Creates an empty store.

pub fn insert<T>(&mut self, key: &'static str, value: T)

where T: Any + Send + Sync + RefUnwindSafe,

Inserts or replaces a typed extension.

pub fn get<T>(&self, key: &str) -> Option<&T>

where T: Any + Send + Sync + RefUnwindSafe,

Borrows an extension when its key and concrete type both match.

pub fn get_shared<T>(&self, key: &str) -> Option<Arc<T>>

where T: Any + Send + Sync + RefUnwindSafe,

Clones the shared handle to an extension when its type matches.

pub fn clear(&mut self)

Removes every extension.

pub fn is_empty(&self) -> bool

Returns whether no extensions are attached.

pub fn len(&self) -> usize

Returns the number of attached extensions.

pub fn keys(&self) -> impl Iterator<Item = &'static str> + '_

Iterates stable schema keys in lexical order.

Trait Implementations

impl Clone for ExtensionStore

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExtensionStore

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

Formats the value using the given formatter.

impl Default for ExtensionStore

fn default() -> Self

Returns the “default value” for a type.