Struct Value

pub struct Value<T> { /* private fields */ }

Dynamic value.

Cache values are dynamic, but need to be able to be cast into a concrete type. The Value type helps here. By default, it contains a dyn Any, so is able to store any type of data. It is able to be cast into a concrete type. It also contains as state the validity of the type.

Implementations

impl Value<Rc<dyn Any>>

pub fn downcast<T: 'static>(self) -> Option<Value<Rc<T>>>

impl Value<Arc<dyn Any + Send + Sync>>

pub fn downcast<T: Any + Send + Sync>(self) -> Option<Value<Arc<T>>>

impl<T> Value<T>

pub fn new(data: T) -> Self

Create new value with the given data.

pub fn data(&self) -> Option<&T>

Return an option with a reference to the data.

pub fn valid(&self) -> bool

Determine if this data is valid.

pub fn invalidate(&mut self)

Invalidate this data.

Trait Implementations

impl<T: Clone> Clone for Value<T>

fn clone(&self) -> Value<T>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Value<T>

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

Formats the value using the given formatter.

impl<T> Default for Value<T>

fn default() -> Self

Returns the “default value” for a type.

impl<T: PartialEq> PartialEq for Value<T>

fn eq(&self, other: &Value<T>) -> 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<T: Eq> Eq for Value<T>

impl<T> StructuralPartialEq for Value<T>