Post #928001

Been experimenting with coroutines in Rust. I wish there was some syntactic sugar when calling a coroutine inside another coroutine to automatically yield, like how the ? operator automatically returns None/Err. I'm using a little macro_rule to clean it up since I'm doing it so much. """ fn parse_data_state( token_buffer: TokenBuffer, ) -> impl Coroutine<(), Yield = (), Return = Result<Option<token::Token>, error::TokenizerError>> { #[coroutine] move || { match run_to_completion!(xml_decl::parse_xml_decl(token_buffer.clone())) { Ok(Some(token)) => return Ok(Some(token)), _ => (), }; ... } """ """ #[macro_export] macro_rules! run_to_completion { ($coro:expr) => {{ let complete; loop { match core::ops::Coroutine::resume(Pin::new(&mut $coro), ()) { core::ops::CoroutineState::Yielded(y) => yield y, core::ops::CoroutineState::Complete(result) => { complete = result; break; } } } complete }}; } """ #rust #rustlang