Trait Context

pub trait Context<T, E>: Sealed {
    // Required methods
    fn context<C>(self, context: C) -> Result<T, Error>
       where C: Display + Send + Sync + 'static;
    fn with_context<C, F>(self, f: F) -> Result<T, Error>
       where C: Display + Send + Sync + 'static,
             F: FnOnce() -> C;
}

Attach more context to an error.

Inspired by anyhow::Context.

Required Methods

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

where C: Display + Send + Sync + 'static,

Wrap the error value with additional context.

fn with_context<C, F>(self, f: F) -> Result<T, Error>

where C: Display + Send + Sync + 'static, F: FnOnce() -> C,

Wrap the error value with additional context that is evaluated lazily only once an error does occur.

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<T, Infallible> for Option<T>

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

where C: Display + Send + Sync + 'static,

fn with_context<C, F>(self, context: F) -> Result<T, Error>

where C: Display + Send + Sync + 'static, F: FnOnce() -> C,

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

where E: Error + Send + Sync + 'static,

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

where C: Display + Send + Sync + 'static,

fn with_context<C, F>(self, context: F) -> Result<T, Error>

where C: Display + Send + Sync + 'static, F: FnOnce() -> C,

Implementors