Struct zng_var :: TraceValueArgs Copy item path

impl<'a, T: VarValue> TraceValueArgs<'a, T>

pub fn value(&self) -> &'a T

Strongly-typed reference to the new value.

Methods from Deref<Target = AnyVarHookArgs<'a>>§

pub fn value(&self) -> &'a dyn AnyVarValue

Reference the updated value.

pub fn update(&self) -> bool

If update was explicitly requested.

Note that bindings/mappings propagate this update request.

pub fn value_type(&self) -> TypeId

Value type ID.

pub fn tags(&self) -> &[Box<dyn AnyVarValue>]

Custom tag objects.

pub fn tags_vec(&self) -> Vec<Box<dyn AnyVarValue>>

Clone the custom tag objects set by the code that updated the value.

pub fn downcast_value<T: VarValue>(&self) -> Option<&T>

Reference the value, if it is of type T.

pub fn downcast_tags<T: VarValue>(&self) -> impl Iterator<Item = &T> + '_

Reference all custom tag values of type T.

pub fn as_strong<T: VarValue>(&self) -> Option<VarHookArgs<'_, T>>

Try cast to strongly typed args.

Trait Implementations§

impl<'a, T: VarValue> Deref for TraceValueArgs<'a, T>

type Target = AnyVarHookArgs<'a>

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

Auto Trait Implementations§

impl<'a, T> !UnwindSafe for TraceValueArgs<'a, T>

Blanket Implementations§

impl<T> Any for T
where T: 'static + ?Sized,

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more

impl<T> Borrow<T> for T
where T: ?Sized,

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more

impl<T> BorrowMut<T> for T
where T: ?Sized,

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more

impl<T> From<T> for T

fn from(t: T) -> T

Returns the argument unchanged.

impl<T> Instrument for T

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided [Span], returning an Instrumented wrapper. Read more

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more

impl<T, U> Into for T
where U: From<T>,

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

impl<T> IntoEither for T

fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more

fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more