Trait ContextExt 

pub trait ContextExt<T> {
    // Required methods
    fn context<C: Into<String>>(self, context: C) -> Result<T>;
    fn with_context<C: Into<String>, F: FnOnce() -> C>(self, f: F) -> Result<T>;
}

Adds .context(..) / .with_context(..) to Result<T> and Option<T>.

On a Result it wraps the existing error; on an Option a None becomes a client error carrying the context message.

Required Methods

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

Attaches context to the error path.

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

Attaches a lazily-built context message to the error path.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementations on Foreign Types

impl<T> ContextExt<T> for Option<T>

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

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

Implementors

impl<T> ContextExt<T> for Result<T>