Trait Context 

pub trait Context<T> {
    // Required methods
    fn context(self, msg: impl Into<String>) -> Result<T, Error>;
    fn with_context<F, S>(self, cb: F) -> Result<T, Error>
       where F: Fn() -> S,
             S: Into<String>;
}

Helper trait for creating Error instances.

This trait is inspired by anyhow::Context.

Examples

use genpdfi_extended::error::{Context as _, Error};
use std::io;
let res: Result<(), io::Error> = Err(io::Error::new(io::ErrorKind::Other, "boom"));
let mapped = res.context("wrapped");
assert!(mapped.is_err());

Required Methods

fn context(self, msg: impl Into<String>) -> Result<T, Error>

Maps the error to an Error instance with the given message.

fn with_context<F, S>(self, cb: F) -> Result<T, Error>

where F: Fn() -> S, S: Into<String>,

Maps the error to an Error instance message produced by the given callback.

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, E: Into<ErrorKind>> Context<T> for Result<T, E>

fn context(self, msg: impl Into<String>) -> Result<T, Error>

fn with_context<F, S>(self, cb: F) -> Result<T, Error>

where F: Fn() -> S, S: Into<String>,

Implementors