io-enum

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

Usage

Add this to your Cargo.toml:

[dependencies]
io-enum = "0.2"

Compiler support: requires rustc 1.31+

Examples

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

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

fn foo(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][proc-macro-derive] 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.