done
Test whether a coroutine handle has finished.
Syntax#
done(handle_expr)| Argument | Type | Description |
|---|---|---|
handle_expr | coroutine<Y, S> | Handle from calling an gen fn |
Returns#
bool — true after the coroutine body has returned (or fallen off the end); false while still suspended at a yield or before the first resume.
Example#
use io::{stdout};
use io::sync::{write_all};
use string::{format, to_bytes};
let h = counter();
write_all(stdout(), to_bytes(format("%z", done(h)))); // false
resume h;
resume h; // completes
write_all(stdout(), to_bytes(format("%z", done(h)))); // true