Crate io_enum

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

Examples

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

#[derive(Read, BufRead, Write, Seek)]
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 for how to automate patterns like this.

Supported traits

• Read
• BufRead
• Write
• Seek

See auto_enums#11 for other traits.

Crate Features

• read_initializer
  • Disabled by default.
  • Implements io::Read::read_initializer.
  • This requires Rust Nightly and you need to enable the unstable read_initializer feature gate.

Derive Macros

BufRead
Read
Seek
Write