Trait ExtractRef

Source

pub trait ExtractRef<T> {
    // Required method
    fn extract_ref(app: &AppBuilder) -> Result<&T, AppError>;

    // Provided method
    fn dependencies() -> Dependencies { ... }
}

Expand description

Trait for extracting borrowed references from the application builder.

This trait allows extracting components or service handles from the application by reference, avoiding the need for cloning. This is more efficient when you only need to read from the component.

§Type Parameters

T - The type to extract a reference to from the application.

§Examples

use diode::{AppBuilder, AppError, ExtractRef};

struct ConfigExtractor;

impl ExtractRef<String> for ConfigExtractor {
    fn extract_ref<'a>(app: &'a AppBuilder) -> Result<&'a String, AppError> {
        app.get_component_ref::<String>()
            .ok_or(AppError::MissingDependency)
    }
}