State

Struct State 

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pub struct State<T: Clone>(pub T);
Expand description

Retrieve the state an action expects. This has the side-effect of creating a state dependency for the action. All actions in a given system must share the same state type.

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§0: T

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impl<T: Clone + Clone> Clone for State<T>

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

Returns a duplicate of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl<StateContents> Extractor<StateContents> for State<StateContents>
where StateContents: Clone + Send + Sync,

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type Error = StateNotReadyError

The error type for this extractor. Anything that can be converted into an extractor error can be used as an error type. Read more
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fn extract( _: Frame, context: &Context<StateContents>, ) -> Result<Self, Self::Error>

Take an frame and a state and return a result containing the extracted value or the frame.
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fn extract_from_frame_and_state( frame: Frame, context: &Context<State>, ) -> Result<Self>
where Self: Sized, Self::Error: Into<ExtractorError>,

Extract a value from a frame and state, returning a result containing the extracted value or an error coerced into a crate::Error.

Auto Trait Implementations§

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impl<T> Freeze for State<T>
where T: Freeze,

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impl<T> RefUnwindSafe for State<T>
where T: RefUnwindSafe,

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impl<T> Send for State<T>
where T: Send,

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impl<T> Sync for State<T>
where T: Sync,

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impl<T> Unpin for State<T>
where T: Unpin,

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impl<T> UnwindSafe for State<T>
where T: UnwindSafe,

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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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dest. Read more
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impl<T> DynClone for T
where T: Clone,

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fn __clone_box(&self, _: Private) -> *mut ()

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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> FromRef<T> for T
where T: Clone,

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fn from_ref(input: &T) -> T

Converts to this type from a reference to the input type.
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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> Same for T

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type Output = T

Should always be Self
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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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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fn with_current_subscriber(self) -> WithDispatch<Self>

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,

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impl<A, B, T> HttpServerConnExec<A, B> for T
where B: Body,