Macro join::try_join_spawn

macro_rules! try_join_spawn {
    #[proc_macro_hack(support_nested)] => { ... };
}

Use to spawn ::std::thread per each step of each branch. It transposes tuple of Results/Options into Result/Option of tuple or single Result/Option in case of 1 branch.

Example:

extern crate join;

use join::try_join_spawn;

fn main() {
    let product = try_join_spawn! {
        Ok::<_,()>(2) |> |v| v + 2 ?? |_| {
            println!("Hello from parallel world!");
            ::std::thread::sleep(::std::time::Duration::from_secs(1));
            println!("I'm done.");
        },
        Ok::<_,()>(3) ?? |_| {
            println!("Hello from parallel world again!");
            ::std::thread::sleep(::std::time::Duration::from_secs(2));
            println!("Me too.");
        },
        Ok::<_,()>(4),
        map => |a, b, c| a * b * c
    }.unwrap();

    assert_eq!(product, 48);
}