Struct icu_provider::marker::NeverMarker
source · 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§
source§impl<Y: Clone> Clone for NeverMarker<Y>
impl<Y: Clone> Clone for NeverMarker<Y>
source§fn clone(&self) -> NeverMarker<Y>
fn clone(&self) -> NeverMarker<Y>
Returns a copy of the value. Read more
1.0.0 · source§fn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from
source
. Read moresource§impl<Y> DataMarker for NeverMarker<Y>where
for<'a> Y: Yokeable<'a>,
impl<Y> DataMarker for NeverMarker<Y>where
for<'a> Y: Yokeable<'a>,
source§impl<Y: Debug> Debug for NeverMarker<Y>
impl<Y: Debug> Debug for NeverMarker<Y>
source§impl<Y> KeyedDataMarker for NeverMarker<Y>where
for<'a> Y: Yokeable<'a>,
impl<Y> KeyedDataMarker for NeverMarker<Y>where
for<'a> Y: Yokeable<'a>,
source§fn bind<P>(provider: P) -> DataProviderWithKey<Self, P>where
P: DataProvider<Self>,
Self: Sized,
fn bind<P>(provider: P) -> DataProviderWithKey<Self, P>where
P: DataProvider<Self>,
Self: Sized,
Binds this
KeyedDataMarker
to a provider supporting it.impl<Y: Copy> Copy for NeverMarker<Y>
Auto Trait Implementations§
impl<Y> Freeze for NeverMarker<Y>
impl<Y> RefUnwindSafe for NeverMarker<Y>where
Y: RefUnwindSafe,
impl<Y> Send for NeverMarker<Y>where
Y: Send,
impl<Y> Sync for NeverMarker<Y>where
Y: Sync,
impl<Y> Unpin for NeverMarker<Y>where
Y: Unpin,
impl<Y> UnwindSafe for NeverMarker<Y>where
Y: UnwindSafe,
Blanket Implementations§
source§impl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
source§fn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
source§impl<T> CloneToUninit for Twhere
T: Clone,
impl<T> CloneToUninit for Twhere
T: Clone,
source§unsafe fn clone_to_uninit(&self, dst: *mut T)
unsafe fn clone_to_uninit(&self, dst: *mut T)
🔬This is a nightly-only experimental API. (
clone_to_uninit
)