#io #derive #enum

macro io-enum

#[derive(Read, Write, Seek, BufRead)] for enums

13 releases (2 stable)

1.0.1 Apr 6, 2021
1.0.0 Jan 27, 2021
0.2.6 Jan 5, 2021
0.2.5 Dec 29, 2020
0.1.3 Mar 4, 2019

#260 in Rust patterns

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Apache-2.0 OR MIT

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io-enum

crates.io docs.rs license rustc build status

#[derive(Read, Write, Seek, BufRead)] for enums.

Usage

Add this to your Cargo.toml:

[dependencies]
io-enum = "1"

Compiler support: requires rustc 1.31+

Examples

use std::{
    fs::File,
    io::{self, Write},
    path::Path,
};

use io_enum::*;

#[derive(Read, Write, Seek, BufRead)]
enum Either<A, B> {
    A(A),
    B(B),
}

fn func(path: Option<&Path>) -> impl Write {
    if let Some(path) = path {
        Either::A(File::open(path).unwrap())
    } else {
        Either::B(io::stdout())
    }
}

See auto_enums crate for how to automate patterns like this.

Supported traits

Related Projects

  • auto_enums: A library for to allow multiple return types by automatically generated enum.
  • derive_utils: A procedural macro helper for easily writing derives macros for enums.
  • futures-enum: #[derive(Future, Stream, Sink, AsyncRead, AsyncWrite, AsyncSeek, AsyncBufRead)] for enums.
  • iter-enum: #[derive(Iterator, DoubleEndedIterator, ExactSizeIterator, Extend)] for enums.

License

Licensed under either of Apache License, Version 2.0 or MIT license at your option.

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.

Dependencies

~240–650KB
~15K SLoC