Trait zng::var::AnyWeakVar

pub trait AnyWeakVar:
    Any
    + Send
    + Sync
    + Sealed {
    // Required methods
    fn clone_any(&self) -> Box<dyn AnyWeakVar>;
    fn as_any(&self) -> &(dyn Any + 'static);
    fn strong_count(&self) -> usize;
    fn weak_count(&self) -> usize;
    fn upgrade_any(&self) -> Option<Box<dyn AnyVar>>;
}

Represents a weak reference to an AnyVar.

Required Methods

fn clone_any(&self) -> Box<dyn AnyWeakVar>

Clone the weak reference.

fn as_any(&self) -> &(dyn Any + 'static)

Access to dyn Any methods.

fn strong_count(&self) -> usize

Gets the number of strong references to the variable.

This is the same as AnyVar::strong_count.

fn weak_count(&self) -> usize

Gets the number of weak references to the variable.

This is the same as AnyVar::weak_count.

fn upgrade_any(&self) -> Option<Box<dyn AnyVar>>

Upgrade to a strong AnyVar clone.

Returns None if the strong_count is zero.

Trait Implementations

impl Clone for Box<dyn AnyWeakVar>

fn clone(&self) -> Box<dyn AnyWeakVar>

Returns a copy of the value.

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

Performs copy-assignment from source.

Implementors

impl<I, O, S> AnyWeakVar for WeakMapRef<I, O, S>

where I: VarValue, O: VarValue, S: WeakVar<I>,

impl<I, O, S> AnyWeakVar for WeakMapRefBidi<I, O, S>

where I: VarValue, O: VarValue, S: WeakVar<I>,

impl<T> AnyWeakVar for WeakMergeVar<T>

where T: VarValue,

impl<T> AnyWeakVar for WeakArcVar<T>

where T: VarValue,

impl<T> AnyWeakVar for WeakContextualizedVar<T>

where T: VarValue,

impl<T> AnyWeakVar for WeakWhenVar<T>

where T: VarValue,

impl<T, S> AnyWeakVar for WeakCowVar<T, S>

where T: VarValue, S: Var<T>,

impl<T, V> AnyWeakVar for WeakFlatMapVar<T, V>

where T: VarValue, V: Var<T>,

impl<T, V> AnyWeakVar for WeakReadOnlyVar<T, V>

where T: VarValue, V: WeakVar<T>,