quick-error's Introduction

Quick Error

Status: production-ready
Documentation: http://tailhook.github.io/quick-error/

A macro which makes error types pleasant to write.

Features:

Define enum type with arbitrary parameters
Concise notation of Display and Error traits
Full control of Display and Error trait implementation
Any number of From traits
Support for all enum-variants Unit, Tuple and Struct

Here is the comprehensive example:

quick_error! {
    #[derive(Debug)]
    pub enum IoWrapper {
        Io(err: io::Error) {
            from()
            description("io error")
            display("I/O error: {}", err)
            cause(err)
        }
        Other(descr: &'static str) {
            description(descr)
            display("Error {}", descr)
        }
        IoAt { place: &'static str, err: io::Error } {
            cause(err)
            display(me) -> ("{} {}: {}", me.description(), place, err)
            description("io error at")
            from(s: String) -> {
                place: "some string",
                err: io::Error::new(io::ErrorKind::Other, s)
            }
        }
        Discard {
            from(&'static str)
        }
    }
}

License

Licensed under either of

Apache License, Version 2.0, (./LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)

MIT license (./LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in the work by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.

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