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use core::convert;
use core::fmt;
use core::ops::{ControlFlow, FromResidual, Try};
use core::task::Poll;
#[unstable(feature = "ready_macro", issue = "70922")]
#[rustc_macro_transparency = "semitransparent"]
pub macro ready($e:expr) {
match $e {
$crate::task::Poll::Ready(t) => t,
$crate::task::Poll::Pending => {
return $crate::task::Poll::Pending;
}
}
}
#[unstable(feature = "poll_ready", issue = "89780")]
pub struct Ready<T>(pub(crate) Poll<T>);
#[unstable(feature = "poll_ready", issue = "89780")]
impl<T> Try for Ready<T> {
type Output = T;
type Residual = Ready<convert::Infallible>;
#[inline]
fn from_output(output: Self::Output) -> Self {
Ready(Poll::Ready(output))
}
#[inline]
fn branch(self) -> ControlFlow<Self::Residual, Self::Output> {
match self.0 {
Poll::Ready(v) => ControlFlow::Continue(v),
Poll::Pending => ControlFlow::Break(Ready(Poll::Pending)),
}
}
}
#[unstable(feature = "poll_ready", issue = "89780")]
impl<T> FromResidual for Ready<T> {
#[inline]
fn from_residual(residual: Ready<convert::Infallible>) -> Self {
match residual.0 {
Poll::Pending => Ready(Poll::Pending),
}
}
}
#[unstable(feature = "poll_ready", issue = "89780")]
impl<T> FromResidual<Ready<convert::Infallible>> for Poll<T> {
#[inline]
fn from_residual(residual: Ready<convert::Infallible>) -> Self {
match residual.0 {
Poll::Pending => Poll::Pending,
}
}
}
#[unstable(feature = "poll_ready", issue = "89780")]
impl<T> fmt::Debug for Ready<T> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_tuple("Ready").finish()
}
}