gen_iter - iterators using generators.

see the docs for examples and usage.

License

dual MIT / apache-2.0

lib.rs:

gen_iter - create generators to use as iterators

[GenIter] and [gen_iter!]

[GenIter] converts a Generator<(), Return=()> into an iterator over the yielded type of the generator. The return type of the generator needs to be ().

[gen_iter!] helps to create a [GenIter]

#![feature(generators)]

use gen_iter::gen_iter;

fn fibonacci() -> impl Iterator<Item = u64> {
    gen_iter!({
        let mut a = 0;
        let mut b = 1;

        loop {
            let c = a + b;
            a = b;
            b = c;

            yield a;
        }
    })
}

for elem in fibonacci().map(|x| 2 * x).take(10) {
    println!("{}", elem);
}

[GenIterReturn] and [gen_iter_return!]

[GenIterReturn] can be converted from a Generator<()>, &mut GenIterReturn<G> can be used as iterator. The return value of the generator can be got after the iterator is exhausted.

[gen_iter_return!] helps to create a [GenIterReturn].

#![feature(generators)]

use gen_iter::gen_iter_return;

let mut g = gen_iter_return!({
    yield 1;
    yield 2;
    return "done";
});

for y in &mut g {
    println!("yield {}", y);
}
println!("generator is_done={}", g.is_done()); // true
println!("generator returns {}", g.return_or_self().ok().unwrap()); // "done"