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use futures::Poll;
use actor::Actor;
use super::chain::Chain;
use super::{ActorFuture, IntoActorFuture};
#[derive(Debug)]
#[must_use = "futures do nothing unless polled"]
pub struct AndThen<A, B, F>
where A: ActorFuture,
B: IntoActorFuture<Actor=A::Actor>
{
state: Chain<A, B::Future, F>,
}
pub fn new<A, B, F>(future: A, f: F) -> AndThen<A, B, F>
where A: ActorFuture,
B: IntoActorFuture<Actor=A::Actor>
{
AndThen {
state: Chain::new(future, f),
}
}
impl<A, B, F> ActorFuture for AndThen<A, B, F>
where A: ActorFuture,
B: IntoActorFuture<Actor=A::Actor, Error=A::Error>,
F: FnOnce(A::Item, &mut A::Actor, &mut <A::Actor as Actor>::Context) -> B,
{
type Item = B::Item;
type Error = B::Error;
type Actor = A::Actor;
fn poll(&mut self,
act: &mut A::Actor,
ctx: &mut <A::Actor as Actor>::Context) -> Poll<B::Item, B::Error>
{
self.state.poll(act, ctx, |result, f, act, ctx| {
result.map(|e| {
Err(f(e, act, ctx).into_future())
})
})
}
}