Function tbot::compositors::state::map
source · pub fn map<C, S, T, M, MF, H, HF>(
mapper: M,
handler: H
) -> impl Fn(Arc<C>, Arc<S>) -> BoxFuture<'static, ()>where
C: Context,
S: Send + Sync + 'static,
T: Send + 'static,
M: Fn(Arc<C>, Arc<S>) -> MF + Send + Sync + 'static,
MF: Future<Output = T> + Send + 'static,
H: Fn(T) -> HF + Send + Sync + 'static,
HF: Future<Output = ()> + Send + 'static,
Expand description
Maps updates: calls mapper
, and then passes its return value to handler
.
Note that handler
does not receive the state. If you need it,
return it from mapper
in a tuple.
Example
use tbot::{Bot, contexts::Text, compositors::state::map};
use std::sync::{Arc, atomic::AtomicU32};
let mut bot = Bot::from_env("BOT_TOKEN").stateful_event_loop(AtomicU32::new(0));
bot.text(map(
|context: Arc<Text>, state: Arc<AtomicU32>| async move {
(context.text.clone(), state)
},
|(text, _state)| async move {
dbg!(text);
},
));