futures-enum

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

Usage

Add this to your Cargo.toml:

[dependencies]
futures-enum = "0.1.16"
futures = "0.3"

Examples

use std::future::Future;

use futures_enum::{Future, Stream, Sink, AsyncRead, AsyncWrite, AsyncSeek, AsyncBufRead};

#[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(async { 1 })
    } else {
        Either::B(async move { x })
    }
}

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

See auto_enums crate for how to automate patterns like this.

Supported traits

• Future - example | generated code
• Stream - example | generated code
• Sink - example | generated code
• AsyncRead - example | generated code
• AsyncWrite - example | generated code
• AsyncSeek - example | generated code
• AsyncBufRead - example | generated code

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.
• io-enum: #[derive(Read, Write, Seek, BufRead)] 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.