Struct WithContext 

pub struct WithContext<Fut, E, C> { /* private fields */ }

Future wrapper produced by .with_context() to add error context.

Wraps the original future, and on error, attaches the context string lazily generated by the stored closure.

Trait Implementations

impl<Fut, T, E, C> Future for WithContext<Fut, E, C>

where Fut: Future<Output = Result<T, E>>, E: Error + 'static, C: FnOnce(&E) -> String,

fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output>

Polls the wrapped future, converting any error by adding context.

If the wrapped future resolves to Ok, passes the value through. If Err, applies the context closure, wraps the error (without invoking hooks!).

type Output = Result<T, AsyncError<E>>

The type of value produced on completion.