Trait KeyedDataMarker

pub trait KeyedDataMarker: DataMarker {
    const KEY: DataKey;

    // Provided method
    fn bind<P>(provider: P) -> DataProviderWithKey<Self, P>
       where P: DataProvider<Self>,
             Self: Sized { ... }
}

A DataMarker with a DataKey attached.

Structs implementing this trait are normally generated with the data_struct! macro.

Implementing this trait enables this marker to be used with the main DataProvider trait. Most markers should be associated with a specific key and should therefore implement this trait.

BufferMarker and AnyMarker are examples of markers that do not implement this trait because they are not specific to a single key.

Note: KeyedDataMarkers are quasi-const-generic compile-time objects, and as such are expected to be unit structs. As this is not something that can be enforced by the type system, we currently only have a 'static bound on them (which is needed by a lot of our code).

Required Associated Constants

const KEY: DataKey

The single DataKey associated with this marker.

Provided Methods

fn bind<P>(provider: P) -> DataProviderWithKey<Self, P>

where P: DataProvider<Self>, Self: Sized,

Binds this KeyedDataMarker to a provider supporting it.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors

impl KeyedDataMarker for HelloWorldV1Marker

const KEY: DataKey = _

impl<Y> KeyedDataMarker for NeverMarker<Y>

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

const KEY: DataKey = _