cgp_error/
can_raise_error.rs

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use cgp_component::{cgp_component, DelegateComponent, HasComponents, UseDelegate};

use crate::has_error_type::HasErrorType;

/**
   Used for injecting external error types into [`Self::Error`](HasErrorType::Error).

   As an example, if `Context: CanRaiseError<ParseIntError>`, then we would be
   able to call `Context::raise_error(err)` for an error value
   [`err: ParseIntError`](core::num::ParseIntError) and get back
   a [`Context::Error`](HasErrorType::Error) value.
*/
#[cgp_component {
    provider: ErrorRaiser
}]
pub trait CanRaiseError<E>: HasErrorType {
    fn raise_error(e: E) -> Self::Error;
}

impl<Context, Error, Components, Delegate> ErrorRaiser<Context, Error> for UseDelegate<Components>
where
    Context: HasErrorType,
    Components: DelegateComponent<Error, Delegate = Delegate>,
    Delegate: ErrorRaiser<Context, Error>,
{
    fn raise_error(e: Error) -> Context::Error {
        Delegate::raise_error(e)
    }
}