Function crius::command_with_fallback

pub fn command_with_fallback<I, O, E>(
    config: Config,
    function: CommandFn<I, O, E>,
    fallback: FallbackFn<O, E>
) -> Result<Command<I, O, E>, CriusError>where
    E: From<CriusError>,

Use this function to construct a circuit breaker with a fallback function:

Example:

// Define a simple circuit breaker command:
let mut cmd = command_with_fallback(
    Config::default(),

    // Same function as in the `command`-example
    double_if_lt_ten,

    // Define a fallback:
    |_err| 4, // It's always four.
).unwrap();

// and run it with an example input:
let result = cmd.run(11);
assert_eq!(Ok(4), result)