Struct ATTRS

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pub struct ATTRS { /* private fields */ }
Expand description

The attrs table from the global Config.

This cell is guaranteed to be initialized during the execution of all PanelConfig::parse functions.

Methods from Deref<Target = OnceCell<HashMap<String, Value>>>§

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pub fn initialized(&self) -> bool

Returns true if the OnceCell currently contains a value, and false otherwise.

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

Returns a reference to the value currently stored in the OnceCell, or None if the OnceCell is empty.

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pub fn set(&self, value: T) -> Result<(), SetError<T>>

Sets the value of the OnceCell to the given value if the OnceCell is empty.

If the OnceCell already has a value, this call will fail with an SetError::AlreadyInitializedError.

If the OnceCell is empty, but some other task is currently trying to set the value, this call will fail with SetError::InitializingError.

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pub async fn get_or_init<F, Fut>(&self, f: F) -> &T
where F: FnOnce() -> Fut, Fut: Future<Output = T>,

Gets the value currently in the OnceCell, or initialize it with the given asynchronous operation.

If some other task is currently working on initializing the OnceCell, this call will wait for that other task to finish, then return the value that the other task produced.

If the provided operation is cancelled or panics, the initialization attempt is cancelled. If there are other tasks waiting for the value to be initialized, one of them will start another attempt at initializing the value.

This will deadlock if f tries to initialize the cell recursively.

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pub async fn get_or_try_init<E, F, Fut>(&self, f: F) -> Result<&T, E>
where F: FnOnce() -> Fut, Fut: Future<Output = Result<T, E>>,

Gets the value currently in the OnceCell, or initialize it with the given asynchronous operation.

If some other task is currently working on initializing the OnceCell, this call will wait for that other task to finish, then return the value that the other task produced.

If the provided operation returns an error, is cancelled or panics, the initialization attempt is cancelled. If there are other tasks waiting for the value to be initialized, one of them will start another attempt at initializing the value.

This will deadlock if f tries to initialize the cell recursively.

Trait Implementations§

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impl Deref for ATTRS

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type Target = OnceCell<HashMap<String, Value>>

The resulting type after dereferencing.
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fn deref(&self) -> &OnceCell<HashMap<String, Value>>

Dereferences the value.
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impl LazyStatic for ATTRS

Auto Trait Implementations§

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impl Freeze for ATTRS

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impl RefUnwindSafe for ATTRS

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impl Send for ATTRS

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impl Sync for ATTRS

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impl Unpin for ATTRS

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impl UnwindSafe for ATTRS

Blanket Implementations§

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

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T> Instrument for T

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

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
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fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

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

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

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fn and<P, B, E>(self, other: P) -> And<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new Policy that returns Action::Follow only if self and other return Action::Follow. Read more
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fn or<P, B, E>(self, other: P) -> Or<T, P>
where T: Policy<B, E>, P: Policy<B, E>,

Create a new Policy that returns Action::Follow if either self or other returns Action::Follow. Read more
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impl<P, T> Receiver for P
where P: Deref<Target = T> + ?Sized, T: ?Sized,

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type Target = T

🔬This is a nightly-only experimental API. (arbitrary_self_types)
The target type on which the method may be called.
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<V, T> VZip<V> for T
where V: MultiLane<T>,

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fn vzip(self) -> V

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impl<T> WithSubscriber for T

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fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
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Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
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impl<T> ErasedDestructor for T
where T: 'static,