Trait HasErrorType

pub trait HasErrorType {
    type Error: Async + Debug;
}

This is used for contexts to declare that they have a unique Self::Error type.

Although it is possible for each context to declare their own associated Error type, doing so may result in having multiple ambiguous Self::Error types, if there are multiple associated types with the same name in different traits.

As a result, it is better for context traits to include HasError as their parent traits, so that multiple traits can all refer to the same abstract Self::Error type.

Required Associated Types

type Error: Async + Debug

The Error associated type is also required to implement Debug.

This is to allow Self::Error to be used in calls like .unwrap(), as well as for simpler error logging.

Implementors

impl<Context> HasErrorType for Context

where Context: HasComponents, Context::Components: ProvideErrorType<Context>,

This is used for contexts to declare that they have a unique Self::Error type.

Although it is possible for each context to declare their own associated Error type, doing so may result in having multiple ambiguous Self::Error types, if there are multiple associated types with the same name in different traits.

As a result, it is better for context traits to include HasError as their parent traits, so that multiple traits can all refer to the same abstract Self::Error type.

type Error = <<Context as HasComponents>::Components as ProvideErrorType<Context>>::Error