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Add option conversions for totally ordered antichains #458

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merged 1 commit into from
Mar 18, 2022
Merged

Add option conversions for totally ordered antichains #458

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23 changes: 23 additions & 0 deletions timely/src/progress/frontier.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -229,6 +229,19 @@ impl<T: Clone> Clone for Antichain<T> {

impl<T: TotalOrder> TotalOrder for Antichain<T> { }

impl<T: TotalOrder> Antichain<T> {
/// Convert to the at most one element the antichain contains.
pub fn into_option(mut self) -> Option<T> {
debug_assert!(self.len() <= 1);
self.elements.pop()
}
/// Return a reference to the at most one element the antichain contains.
pub fn as_option(&self) -> Option<&T> {
debug_assert!(self.len() <= 1);
self.elements.last()
}
}

impl<T: Ord+std::hash::Hash> std::hash::Hash for Antichain<T> {
fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
let mut temp = self.elements.iter().collect::<Vec<_>>();
Expand Down Expand Up @@ -711,6 +724,16 @@ impl<'a, T: PartialOrder> PartialOrder for AntichainRef<'a, T> {
}
}

impl<'a, T: TotalOrder> TotalOrder for AntichainRef<'a, T> { }

impl<'a, T: TotalOrder> AntichainRef<'a, T> {
/// Return a reference to the at most one element the antichain contains.
pub fn as_option(&self) -> Option<&T> {
debug_assert!(self.len() <= 1);
self.frontier.last()
}
}

impl<'a, T> ::std::ops::Deref for AntichainRef<'a, T> {
type Target = [T];
fn deref(&self) -> &Self::Target {
Expand Down