Function tbot::compositors::state::filter[][src]

pub fn filter<C, S, P, PF, H, HF>(
    predicate: P,
    handler: H
) -> impl Fn(Arc<C>, Arc<S>) -> BoxFuture<'static, ()> where
    C: Context,
    S: Send + Sync + 'static,
    P: Fn(Arc<C>, Arc<S>) -> PF + Send + Sync + 'static,
    PF: Future<Output = bool> + Send + 'static,
    H: Fn(Arc<C>, Arc<S>) -> HF + Send + Sync + 'static,
    HF: Future<Output = ()> + Send + 'static, 

Filters updates: executes handler only if predicate returns true.

Example

use tbot::{
    Bot, contexts::Text, compositors::state::filter,
    predicates::{without_state, chat::is_group},
};
use std::sync::{Arc, atomic::AtomicU32};

let mut bot = Bot::from_env("BOT_TOKEN").stateful_event_loop(AtomicU32::new(0));
bot.text(filter(
    without_state(is_group),
    |context: Arc<Text>, state: Arc<AtomicU32>| async move {
        // Do something assuming we're in a group
    },
));