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#![cfg_attr(not(feature = "net"), allow(unreachable_pub))]
use crate::io::driver::Ready;
use std::fmt;
use std::ops;
/// Readiness event interest
///
/// Specifies the readiness events the caller is interested in when awaiting on
/// I/O resource readiness states.
#[cfg_attr(docsrs, doc(cfg(feature = "net")))]
#[derive(Clone, Copy, Eq, PartialEq)]
pub struct Interest(mio::Interest);
impl Interest {
/// Interest in all readable events.
///
/// Readable interest includes read-closed events.
pub const READABLE: Interest = Interest(mio::Interest::READABLE);
/// Interest in all writable events
///
/// Writable interest includes write-closed events.
pub const WRITABLE: Interest = Interest(mio::Interest::WRITABLE);
/// Returns true if the value includes readable interest.
///
/// # Examples
///
/// ```
/// use tokio::io::Interest;
///
/// assert!(Interest::READABLE.is_readable());
/// assert!(!Interest::WRITABLE.is_readable());
///
/// let both = Interest::READABLE | Interest::WRITABLE;
/// assert!(both.is_readable());
/// ```
pub const fn is_readable(self) -> bool {
self.0.is_readable()
}
/// Returns true if the value includes writable interest.
///
/// # Examples
///
/// ```
/// use tokio::io::Interest;
///
/// assert!(!Interest::READABLE.is_writable());
/// assert!(Interest::WRITABLE.is_writable());
///
/// let both = Interest::READABLE | Interest::WRITABLE;
/// assert!(both.is_writable());
/// ```
pub const fn is_writable(self) -> bool {
self.0.is_writable()
}
/// Add together two `Interst` values.
///
/// This function works from a `const` context.
///
/// # Examples
///
/// ```
/// use tokio::io::Interest;
///
/// const BOTH: Interest = Interest::READABLE.add(Interest::WRITABLE);
///
/// assert!(BOTH.is_readable());
/// assert!(BOTH.is_writable());
pub const fn add(self, other: Interest) -> Interest {
Interest(self.0.add(other.0))
}
// This function must be crate-private to avoid exposing a `mio` dependency.
pub(crate) const fn to_mio(self) -> mio::Interest {
self.0
}
pub(super) fn mask(self) -> Ready {
match self {
Interest::READABLE => Ready::READABLE | Ready::READ_CLOSED,
Interest::WRITABLE => Ready::WRITABLE | Ready::WRITE_CLOSED,
_ => Ready::EMPTY,
}
}
}
impl ops::BitOr for Interest {
type Output = Self;
#[inline]
fn bitor(self, other: Self) -> Self {
self.add(other)
}
}
impl ops::BitOrAssign for Interest {
#[inline]
fn bitor_assign(&mut self, other: Self) {
self.0 = (*self | other).0;
}
}
impl fmt::Debug for Interest {
fn fmt(&self, fmt: &mut fmt::Formatter<'_>) -> fmt::Result {
self.0.fmt(fmt)
}
}
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