Trait icu_provider::erased::ErasedDataStruct

pub trait ErasedDataStruct: 'static + Debug {
    fn clone_into_box(&self) -> Box<dyn ErasedDataStruct>;
    fn into_any(self: Box<Self>) -> Box<dyn Any>;
    fn as_any(&self) -> &dyn Any;
}

Auto-implemented trait allowing for type erasure of data provider structs.

Requires the static lifetime in order to be convertible to Any.

Required methods

fn clone_into_box(&self) -> Box<dyn ErasedDataStruct>

Clone this trait object reference, returning a boxed trait object.

fn into_any(self: Box<Self>) -> Box<dyn Any>

Return this boxed trait object as Box<dyn Any>.

Examples

use icu_provider::erased::ErasedDataStruct;
use icu_provider::hello_world::HelloWorldV1;

// Create type-erased box
let erased: Box<dyn ErasedDataStruct> = Box::new(HelloWorldV1::default());

// Convert to typed box
let boxed: Box<HelloWorldV1> = erased.into_any().downcast().expect("Types should match");

fn as_any(&self) -> &dyn Any

Return this trait object reference as &dyn Any.

Also see associated method downcast_ref().

Examples

use icu_provider::erased::ErasedDataStruct;
use icu_provider::hello_world::HelloWorldV1;

// Create type-erased reference
let data = HelloWorldV1::default();
let erased: &dyn ErasedDataStruct = &data;

// Borrow as typed reference
let borrowed: &HelloWorldV1 = erased.as_any().downcast_ref().expect("Types should match");

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Implementations

impl dyn ErasedDataStruct

pub fn downcast_ref<T: Any>(&self) -> Result<&T, Error>

Convenience function: Return a downcast reference, or an error if mismatched types.

Examples

use icu_provider::erased::ErasedDataStruct;
use icu_provider::hello_world::HelloWorldV1;

// Create type-erased reference
let data = HelloWorldV1::default();
let erased: &dyn ErasedDataStruct = &data;

// Borrow as typed reference
let borrowed: &HelloWorldV1 = erased.downcast_ref().expect("Types should match");

Trait Implementations

impl DataExporter<'_, dyn ErasedDataStruct + 'static> for HelloWorldProvider<'static>

Adds entries to a HelloWorldProvider from ErasedDataStruct

fn put_payload(
    &mut self,
    req: &DataRequest,
    payload: &dyn ErasedDataStruct
) -> Result<(), Box<dyn Error>>

Save a payload corresponding to the given data request (resource path).

fn include_resource_options(&self, _resc_options: &ResourceOptions) -> bool

Whether to load and dump data for the given entry. This function enables the DataExporter to filter out certain data entries.

fn put_key_from_provider<'d>(
    &mut self,
    resc_key: &ResourceKey,
    provider: &impl IterableDataProvider<'d, T>
) -> Result<(), Error> where
    's: 'd, 

Auto-implemented function that loads data from an IterableDataProvider and dumps it into this DataExporter.

impl<'d, 's> DataProvider<'d, dyn ErasedDataStruct + 's> for HelloWorldProvider<'static> where
    's: 'd, 

fn load_payload(
    &self,
    req: &DataRequest
) -> Result<DataResponse<'d, dyn ErasedDataStruct + 's>, DataError>

Query the provider for data, returning the result.

impl<'s> ToOwned for dyn ErasedDataStruct + 's

type Owned = Box<dyn ErasedDataStruct + 's>

The resulting type after obtaining ownership.

fn to_owned(&self) -> Self::Owned

Creates owned data from borrowed data, usually by cloning.

pub fn clone_into(&self, target: &mut Self::Owned)

🔬 This is a nightly-only experimental API. (toowned_clone_into)

recently added

Uses borrowed data to replace owned data, usually by cloning.

Implementors

impl<T> ErasedDataStruct for T where
    T: Clone + Debug + Any, 

fn clone_into_box(&self) -> Box<dyn ErasedDataStruct>

fn into_any(self: Box<Self>) -> Box<dyn Any>

fn as_any(&self) -> &dyn Any

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