Struct ExternRef 

pub struct ExternRef(/* private fields */);

A nullable reference to an external object.

Implementations

impl ExternRef

pub fn new<T>(store: &mut Store, object: impl Into<Option<T>>) -> Self

where T: Any + Send + Sync + 'static,

Creates a new ExternRef wrapping the given underlying object.

pub fn null() -> Self

Creates a null ExternRef.

pub fn is_null(self) -> bool

Returns true if this ExternRef is null.

pub fn get(self, store: &Store) -> Option<&dyn Any>

Returns a reference to the underlying object if this ExternRef is not null.

Trait Implementations

impl Clone for ExternRef

fn clone(&self) -> ExternRef

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ExternRef

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

Formats the value using the given formatter.

impl From<ExternRef> for Ref

fn from(val: ExternRef) -> Self

Converts to this type from the input type.

impl From<ExternRef> for Val

fn from(val: ExternRef) -> Self

Converts to this type from the input type.

impl Hash for ExternRef

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for ExternRef

fn eq(&self, other: &ExternRef) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ExternRef

impl Eq for ExternRef

impl StructuralPartialEq for ExternRef