Trait icu_provider::any::AnyProvider

source · 
pub trait AnyProvider {
    // Required method
    fn load_any(
        &self,
        key: DataKey,
        req: DataRequest<'_>
    ) -> Result<AnyResponse, DataError>;
}
Expand description

An object-safe data provider that returns data structs cast to dyn Any trait objects.

Examples

use icu_provider::hello_world::*;
use icu_provider::prelude::*;
use std::borrow::Cow;

let any_provider = HelloWorldProvider.as_any_provider();

let req = DataRequest {
    locale: &icu_locid::locale!("de").into(),
    metadata: Default::default(),
};

// Downcasting manually
assert_eq!(
    any_provider
        .load_any(HelloWorldV1Marker::KEY, req)
        .expect("load should succeed")
        .downcast::<HelloWorldV1Marker>()
        .expect("types should match")
        .take_payload()
        .unwrap()
        .get(),
    &HelloWorldV1 {
        message: Cow::Borrowed("Hallo Welt"),
    },
);

// Downcasting automatically
let downcasting_provider: &dyn DataProvider<HelloWorldV1Marker> =
    &any_provider.as_downcasting();

assert_eq!(
    downcasting_provider
        .load(req)
        .expect("load should succeed")
        .take_payload()
        .unwrap()
        .get(),
    &HelloWorldV1 {
        message: Cow::Borrowed("Hallo Welt"),
    },
);

Required Methods§

source

fn load_any( &self, key: DataKey, req: DataRequest<'_> ) -> Result<AnyResponse, DataError>

Loads an AnyPayload according to the key and request.

Implementations on Foreign Types§

source§

impl<T: AnyProvider + ?Sized> AnyProvider for Box<T>

source§

fn load_any( &self, key: DataKey, req: DataRequest<'_> ) -> Result<AnyResponse, DataError>

Implementors§