Is there a way that we can convert from futures 0.1 to the standard library futures?

Question

The async/await feature is coming soon, but there are a lot of libraries still using futures 0.1. How do we convert between the two?

Conver

Answer 1

Use the Future01CompatExt trait:

use futures01::future as future01;
use futures03::compat::Future01CompatExt;

fn make_future_01() -> impl future01::Future<Item = i32, Error = ()> {
    future01::ok(2)
}

async fn example_03_uses_01() -> Result<i32, ()> {
    let v = make_future_01().compat().await?;
    Ok(v)
}

[dependencies]
futures03 = { package = "futures", version = "0.3", features = ["compat"] }
futures01 = { package = "futures", version = "0.1" }