Trait icu_provider::dynutil::UpcastDataPayload
source · pub trait UpcastDataPayload<M>{
// Required method
fn upcast(other: DataPayload<M>) -> DataPayload<Self>;
}
Expand description
Trait to allow conversion from DataPayload<T>
to DataPayload<S>
.
This trait can be manually implemented in order to enable impl_dynamic_data_provider
.
Required Methods§
sourcefn upcast(other: DataPayload<M>) -> DataPayload<Self>
fn upcast(other: DataPayload<M>) -> DataPayload<Self>
Upcast a DataPayload<T>
to a DataPayload<S>
where T
implements trait S
.
§Examples
Upcast and then downcast a data struct of type Cow<str>
(cart type String
) via
AnyPayload
:
use icu_provider::dynutil::UpcastDataPayload;
use icu_provider::hello_world::*;
use icu_provider::prelude::*;
use std::borrow::Cow;
let original = DataPayload::<HelloWorldV1Marker>::from_static_str("foo");
let upcasted = AnyMarker::upcast(original);
let downcasted = upcasted
.downcast::<HelloWorldV1Marker>()
.expect("Type conversion");
assert_eq!(downcasted.get().message, "foo");
Object Safety§
This trait is not object safe.