Exceptions in coroutines?

[niansa]

Hey!

Boost allows you to catch exceptions from the coroutine caller, so this totally works there:

try {
    co_await connect_to_server();
} catch (const connection_refused&) {
    std::cerr << "Connection refused\n";
}

libasync however, doesn't seem to allow that, it just executes std::terminate. Imo this is quite bad, since one of the reasons for why I wanted coroutines is so that I can use exceptions instead of error codes... and here I am again, using error codes :-/

There should at least be an optional feature to allow this!

Thanks
niansa

[avdgrinten]

There's no technical reason why this cannot work, we just didn't implement it. If you have a (partial) implementation, we'd gladly merge it.

Adding support to the basic coroutine types (like async::result) would probably be easy, propagating it through all algorithms might be a bit more work.

[niansa]

That'd be absolutely amazing! Thanks a lot for the hard work put into this :-)