Struct icu_provider::marker::NeverMarker

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pub struct NeverMarker<Y>(/* private fields */);
Expand description

A DataMarker that never returns data.

All types that have non-blanket impls of DataProvider<M> are expected to explicitly implement DataProvider<NeverMarker<Y>>, returning DataErrorKind::MissingDataKey. See impl_data_provider_never_marker!.

§Examples

use icu_locid::langid;
use icu_provider::hello_world::*;
use icu_provider::prelude::*;
use icu_provider::NeverMarker;

let buffer_provider = HelloWorldProvider.into_json_provider();

let result = DataProvider::<NeverMarker<HelloWorldV1<'static>>>::load(
    &buffer_provider.as_deserializing(),
    DataRequest {
        locale: &langid!("en").into(),
        metadata: Default::default(),
    },
);

assert!(matches!(
    result,
    Err(DataError {
        kind: DataErrorKind::MissingDataKey,
        ..
    })
));

Trait Implementations§

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impl<Y: Clone> Clone for NeverMarker<Y>

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fn clone(&self) -> NeverMarker<Y>

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<Y> DataMarker for NeverMarker<Y>
where for<'a> Y: Yokeable<'a>,

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type Yokeable = Y

A type that implements Yokeable. This should typically be the 'static version of a data struct.
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impl<Y: Debug> Debug for NeverMarker<Y>

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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<Y> KeyedDataMarker for NeverMarker<Y>
where for<'a> Y: Yokeable<'a>,

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const KEY: DataKey = _

The single DataKey associated with this marker.
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fn bind<P>(provider: P) -> DataProviderWithKey<Self, P>
where P: DataProvider<Self>, Self: Sized,

Binds this KeyedDataMarker to a provider supporting it.
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impl<Y: Copy> Copy for NeverMarker<Y>

Auto Trait Implementations§

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impl<Y> Freeze for NeverMarker<Y>

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impl<Y> RefUnwindSafe for NeverMarker<Y>
where Y: RefUnwindSafe,

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impl<Y> Send for NeverMarker<Y>
where Y: Send,

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impl<Y> Sync for NeverMarker<Y>
where Y: Sync,

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impl<Y> Unpin for NeverMarker<Y>
where Y: Unpin,

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impl<Y> UnwindSafe for NeverMarker<Y>
where Y: UnwindSafe,

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> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. 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, 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> 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> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T