Trait Context 

pub trait Context<T> {
    // Required methods
    fn context<C>(self, context: C) -> Result<T>
       where C: Display + Debug + Send + Sync + 'static;
    fn with_context<C, F>(self, f: F) -> Result<T>
       where C: Display + Debug + Send + Sync + 'static,
             F: FnOnce() -> C;
    fn with_field<V>(self, key: &'static str, value: V) -> Result<T>
       where V: Display;
    fn with_field_debug<V>(self, key: &'static str, value: V) -> Result<T>
       where V: Debug;
}

Extension trait for adding context and fields to errors.

Required Methods

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

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

Wrap the error value with additional context.

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

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

Wrap the error value with additional context that is evaluated lazily.

fn with_field<V>(self, key: &'static str, value: V) -> Result<T>

where V: Display,

Add a named field to the error.

fn with_field_debug<V>(self, key: &'static str, value: V) -> Result<T>

where V: Debug,

Add a named field with debug formatting to the error.

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> for Option<T>

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

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

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

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

fn with_field<V>(self, key: &'static str, value: V) -> Result<T>

where V: Display,

fn with_field_debug<V>(self, key: &'static str, value: V) -> Result<T>

where V: Debug,

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

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

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

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

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

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

fn with_field<V>(self, key: &'static str, value: V) -> Result<T>

where V: Display,

fn with_field_debug<V>(self, key: &'static str, value: V) -> Result<T>

where V: Debug,

Implementors