Struct NeverMarker

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

A DynamicDataMarker that never returns data.

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

Examples

use icu_locale_core::langid;
use icu_provider::hello_world::*;
use icu_provider::marker::NeverMarker;
use icu_provider::prelude::*;

let buffer_provider = HelloWorldProvider.into_json_provider();

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

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

Trait Implementations

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

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

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<Y> DataMarker for NeverMarker<Y>

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

const INFO: DataMarkerInfo

The single DataMarkerInfo associated with this marker.

impl<Y: Debug> Debug for NeverMarker<Y>

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

Formats the value using the given formatter.

impl<Y> DynamicDataMarker for NeverMarker<Y>

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

type DataStruct = Y

A type that implements Yokeable. This should typically be the 'static version of a data struct.

impl<Y: Copy> Copy for NeverMarker<Y>