[−][src]Trait tiny_fail::FailExt

pub trait FailExt<T> {
    fn context<S: ToString>(self, msg: S) -> Result<T, Fail>;
}

A support trait for implementing rich error message.

This trait implemented for Option and Result. You can

Example

use std::fs::File;
use std::io::{BufRead, BufReader};

use tiny_fail::{Fail, FailExt};

fn foo() -> Result<(), Fail> {
    let f = File::open("not_exists.txt").context("failed open not_exists.txt")?;
    let r = BufReader::new(f);

    for line in r.lines() {
        let line = line.context("failed read line")?;
        let num = line.parse::<f64>().context(format!("failed parse \"{}\" into floating number", line))?;
        println!("{:.2}", num);
    }
    Ok(())
}

Required methods

fn context<S: ToString>(self, msg: S) -> Result<T, Fail>

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Implementations on Foreign Types

impl<T, E: 'static + Send + Sync + Error> FailExt<T> for Result<T, E>[src]

impl<T> FailExt<T> for Option<T>[src]

impl<T> FailExt<T> for Result<T, Fail>[src]

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Implementors

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