Struct icu_provider::any::AnyPayload

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pub struct AnyPayload { /* private fields */ }
Expand description

A type-erased data payload.

The only useful method on this type is AnyPayload::downcast(), which transforms this into a normal DataPayload which you can subsequently access or mutate.

As with DataPayload, cloning is designed to be cheap.

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impl AnyPayload

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pub fn downcast<M>(self) -> Result<DataPayload<M>, DataError>
where M: DataMarker, M::Yokeable: ZeroFrom<'static, M::Yokeable> + MaybeSendSync, for<'a> YokeTraitHack<<M::Yokeable as Yokeable<'a>>::Output>: Clone,

Transforms a type-erased AnyPayload into a concrete DataPayload<M>.

Because it is expected that the call site knows the identity of the AnyPayload (e.g., from the data request), this function returns a DataError if the generic type does not match the type stored in the AnyPayload.

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pub fn downcast_cloned<M>(&self) -> Result<DataPayload<M>, DataError>
where M: DataMarker, M::Yokeable: ZeroFrom<'static, M::Yokeable> + MaybeSendSync, for<'a> YokeTraitHack<<M::Yokeable as Yokeable<'a>>::Output>: Clone,

Clones and then transforms a type-erased AnyPayload into a concrete DataPayload<M>.

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pub fn from_static_ref<Y>(static_ref: &'static Y) -> Self
where Y: for<'a> Yokeable<'a>,

Creates an AnyPayload from a static reference to a data struct.

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

const HELLO_DATA: HelloWorldV1<'static> = HelloWorldV1 {
    message: Cow::Borrowed("Custom Hello World"),
};

let any_payload = AnyPayload::from_static_ref(&HELLO_DATA);

let payload: DataPayload<HelloWorldV1Marker> =
    any_payload.downcast().expect("TypeId matches");
assert_eq!("Custom Hello World", payload.get().message);

Trait Implementations§

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impl Clone for AnyPayload

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fn clone(&self) -> AnyPayload

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for AnyPayload

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

Formats the value using the given formatter. Read more
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impl<'a> Yokeable<'a> for AnyPayload
where Self: Sized,

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type Output = AnyPayload

This type MUST be Self with the 'static replaced with 'a, i.e. Self<'a>
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fn transform(&self) -> &Self::Output

This method must cast self between &'a Self<'static> and &'a Self<'a>. Read more
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fn transform_owned(self) -> Self::Output

This method must cast self between Self<'static> and Self<'a>. Read more
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unsafe fn make(this: Self::Output) -> Self

This method can be used to cast away Self<'a>’s lifetime. Read more
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fn transform_mut<F>(&'a mut self, f: F)
where F: 'static + for<'b> FnOnce(&'b mut Self::Output),

This method must cast self between &'a mut Self<'static> and &'a mut Self<'a>, and pass it to f. Read more

Auto Trait Implementations§

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> CloneToUninit for T
where T: Clone,

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unsafe fn clone_to_uninit(&self, dst: *mut T)

🔬This is a nightly-only experimental API. (clone_to_uninit)
Performs copy-assignment from self to dst. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
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impl<T> ErasedDestructor for T
where T: 'static,

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impl<T> MaybeSendSync for T