composable_tower_http::extract

Struct Optional

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

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impl<T> Optional<T>

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pub const fn new(inner: T) -> Self

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impl<T: Clone> Clone for Optional<T>

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

Returns a copy 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<T: Debug> Debug for Optional<T>

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

Formats the value using the given formatter. Read more
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impl<Ex> Extractor for Optional<Ex>
where Ex: Extractor + Sync,

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type Extracted = Option<<Ex as Extractor>::Extracted>

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type Error = InfallibleError

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async fn extract( &self, headers: &HeaderMap, ) -> Result<Self::Extracted, Self::Error>

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fn extracted_type_name(&self) -> &'static str

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

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

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

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

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

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impl<T> UnwindSafe for Optional<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> ExtensionLayerExt for T
where T: Clone,

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fn extension_layer(self) -> ExtensionLayer<T>

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impl<T> ExtractorExt for T
where T: Extractor,

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fn map<Fn>(self, map: Fn) -> Map<Self, Fn>

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fn async_map<Fn>(self, map: Fn) -> AsyncMap<Self, Fn>

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fn map_err<Fn>(self, map_err: Fn) -> MapError<Self, Fn>

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fn convert<Fn>(self, convert: Fn) -> Convert<Self, Fn>

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fn async_convert<Fn>(self, convert: Fn) -> AsyncConvert<Self, Fn>

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fn chain<C>(self, chain: C) -> ChainExtractor<Self, C>

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fn chain_lite<Fn>(self, chain: Fn) -> ChainLite<Self, Fn>

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fn async_chain_lite<Fn>(self, chain: Fn) -> AsyncChainLite<Self, Fn>

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fn optional(self) -> Optional<Self>

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fn any<Ex>(self, other: Ex) -> Any<Self, Ex>

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fn or<Ex>(self, other: Ex) -> OrExtractor<Self, Ex>

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fn and<Ex>(self, other: Ex) -> AndExtractor<Self, Ex>

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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> ModificationLayerExt for T
where T: Clone,

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fn modification_layer<M>(self) -> ModificationLayer<T, M>

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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<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,