Trait Context

pub trait Context: Sized {
    type Ok;
    type Error: Error;

    // Required method
    fn with_context<C>(
        self,
        context: impl FnOnce() -> C,
    ) -> Result<Self::Ok, Self::Error>
       where C: Display;

    // Provided method
    fn context<C>(self, context: C) -> Result<Self::Ok, Self::Error>
       where C: Display { ... }
}

Adapter for providing context on Result

Required Associated Types

type Ok

type Error: Error

Required Methods

fn with_context<C>( self, context: impl FnOnce() -> C, ) -> Result<Self::Ok, Self::Error>

where C: Display,

Wrap Err in context by calling given function

Provided Methods

fn context<C>(self, context: C) -> Result<Self::Ok, Self::Error>

where C: Display,

Wrap Err in given context

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl<T> Context for Option<T>

type Ok = T

type Error = StringError

fn with_context<C>( self, context: impl FnOnce() -> C, ) -> Result<Self::Ok, Self::Error>

where C: Display,

impl<T, E> Context for Result<T, E>

where E: Error,

type Ok = T

type Error = E

fn with_context<C>(self, context: impl FnOnce() -> C) -> Result<T, E>

where C: Display,

Implementors