Trait mango_v4::error::Contextable

pub trait Contextable {
    // Required methods
    fn context(self, c: impl Display) -> Self;
    fn with_context<C, F>(self, c: F) -> Self
       where C: Display,
             F: FnOnce() -> C;
}

Required Methods

fn context(self, c: impl Display) -> Self

Add a context string c to a Result or Error

Example: foo().context(“calling foo”)?;

fn with_context<C, F>(self, c: F) -> Selfwhere C: Display, F: FnOnce() -> C,

Like context(), but evaluate the context string lazily

Use this if it’s expensive to generate, like a format!() call.

Implementations on Foreign Types

impl<T> Contextable for Result<T>

fn context(self, c: impl Display) -> Self

fn with_context<C, F>(self, c: F) -> Selfwhere C: Display, F: FnOnce() -> C,

impl Contextable for Error

fn context(self, c: impl Display) -> Self

fn with_context<C, F>(self, c: F) -> Selfwhere C: Display, F: FnOnce() -> C,

Implementors