Trait error_stack::provider::Provider

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pub trait Provider {
    fn provide<'a>(&'a self, demand: &mut Demand<'a>);
}

Available on nightly only.

Expand description

Trait implemented by a type which can dynamically provide values based on type.

Required Methods

source

fn provide<'a>(&'a self, demand: &mut Demand<'a>)

Data providers should implement this method to provide all values they are able to provide by using demand.

Examples

Provides a reference to a field with type String as a &str.

use error_stack::provider::{Demand, Provider};

impl Provider for SomeConcreteType {
    fn provide<'a>(&'a self, demand: &mut Demand<'a>) {
        demand.provide_ref::<str>(&self.field);
    }
}