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/// [`Epoch`] represents the period of time the global epoch value stays the same.
#[derive(Clone, Copy, Debug, Default, Eq, PartialEq, PartialOrd, Ord)]
pub struct Epoch {
value: u8,
}
impl Epoch {
/// Returns the next [`Epoch`] value.
///
/// ```
/// use sdd::Epoch;
///
/// let initial = Epoch::default();
///
/// let next = initial.next();
/// assert!(initial < next);
///
/// let next_next = next.next();
/// assert!(next < next_next);
/// ```
#[inline]
#[must_use]
pub fn next(self) -> Epoch {
match self.value {
0 => Epoch { value: 1 },
1 => Epoch { value: 2 },
_ => Epoch { value: 0 },
}
}
/// Returns the previous [`Epoch`] value.
///
/// ```
/// use sdd::Epoch;
///
/// let initial = Epoch::default();
///
/// let prev = initial.prev();
/// assert!(initial < prev);
///
/// let prev_prev = prev.prev();
/// assert!(prev_prev < prev);
/// ```
#[inline]
#[must_use]
pub fn prev(self) -> Epoch {
match self.value {
0 => Epoch { value: 2 },
1 => Epoch { value: 0 },
_ => Epoch { value: 1 },
}
}
/// Construct an [`Epoch`] from a [`u8`] value.
#[inline]
pub(super) fn from_u8(value: u8) -> Epoch {
Epoch { value }
}
}
impl From<Epoch> for u8 {
#[inline]
fn from(epoch: Epoch) -> Self {
epoch.value
}
}