Struct cotton::prelude::Problem

pub struct Problem { /* fields omitted */ }

Wraps error, context and backtrace information and formats it for display. Data is heap allocated to avoid type parameters or lifetimes.

Methods

impl Problem

pub fn from_error<impl Into>>(
    error: impl Into>
) -> Problem where
    impl Into>: Into<Box<dyn Error + 'static>>, 

Create Problem from types implementing Into<Box<dyn Error>> (including String and &str) so that Error::cause chain is followed through in the Display message

pub fn from_error_message<impl Error>(error: &impl Error) -> Problem where
    impl Error: Error, 

Same as Problem::from_error but stores only final message as String and does not take ownership of the error

pub fn backtrace(&self) -> Option<&str>

Get backtrace associated with this Problem instance if available

Trait Implementations

impl ProblemWhile for Problem

type WithContext = Problem

fn problem_while<impl ToString>(self, message: impl ToString) -> Problem where
    impl ToString: ToString, 

Add context information

fn problem_while_with<F, M>(self, message: F) -> Problem where
    F: FnOnce() -> M,
    M: ToString, 

Add context information from function call

impl Display for Problem

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl Debug for Problem

fn fmt(&self, f: &mut Formatter) -> Result<(), Error>

Formats the value using the given formatter.

impl<E> From<E> for Problem where
    E: Into<Box<dyn Error + 'static>>, 

Every type implementing Into<Box<dyn Error>> trait (including String and &str types) can be converted to Problem via ? operator

fn from(error: E) -> Problem

Performs the conversion.