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#[macro_export]
macro_rules! try_ready {
($e:expr) => (match $e {
Ok($crate::Async::Ready(t)) => t,
Ok($crate::Async::NotReady) => return Ok($crate::Async::NotReady),
Err(e) => return Err(From::from(e)),
})
}
pub type Poll<T, E> = Result<Async<T>, E>;
#[derive(Copy, Clone, Debug, PartialEq)]
pub enum Async<T> {
Ready(T),
NotReady,
}
impl<T> Async<T> {
pub fn map<F, U>(self, f: F) -> Async<U>
where F: FnOnce(T) -> U
{
match self {
Async::NotReady => Async::NotReady,
Async::Ready(t) => Async::Ready(f(t)),
}
}
pub fn is_not_ready(&self) -> bool {
match *self {
Async::NotReady => true,
Async::Ready(_) => false,
}
}
pub fn is_ready(&self) -> bool {
!self.is_not_ready()
}
}
impl<T> From<T> for Async<T> {
fn from(t: T) -> Async<T> {
Async::Ready(t)
}
}