futures-enum

#[derive(Future, Stream, Sink, AsyncRead, AsyncWrite, AsyncSeek, AsyncBufRead)] for enums.

Usage

Add this to your Cargo.toml:

[dependencies]
futures-enum = "0.1.11"
futures-preview = "0.3.0-alpha.19"

The current futures-enum requires Rust 1.36 or later.

Examples

use futures::future::{self, Future};
use futures_enum::*;

#[derive(Future, Stream, Sink, AsyncRead, AsyncWrite, AsyncSeek, AsyncBufRead)]
enum Either<A, B> {
    A(A),
    B(B),
}

fn foo(x: i32) -> impl Future<Output = i32> {
    if x < 0 {
        Either::A(future::lazy(|_| 1))
    } else {
        Either::B(future::ready(x))
    }
}

See auto_enums for how to automate patterns like this.

futures-enum works well even if the dependency contains only sub-crates such as futures-core, futures-io, etc.

Supported traits

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