Merge pull request #170 from gwbres/hash

epoch: derive Hash

src/duration.rs

@@ -18,6 +18,7 @@ extern crate core;
 use core::cmp::Ordering;
 use core::convert::TryInto;
 use core::fmt;
+use core::hash::{Hash, Hasher};
 use core::ops::{Add, AddAssign, Div, Mul, Neg, Sub, SubAssign};
 
 #[cfg(feature = "std")]
@@ -82,6 +83,13 @@ impl PartialEq for Duration {
     }
 }
 
+impl Hash for Duration {
+    fn hash<H: Hasher>(&self, hasher: &mut H) {
+        self.centuries.hash(hasher);
+        self.nanoseconds.hash(hasher);
+    }
+}
+
 impl Default for Duration {
     fn default() -> Self {
         Duration::ZERO

src/epoch.rs

@@ -17,6 +17,7 @@ use crate::{
 };
 use core::cmp::{Eq, Ord, Ordering, PartialEq, PartialOrd};
 use core::fmt;
+use core::hash::{Hash, Hasher};
 use core::ops::{Add, AddAssign, Sub, SubAssign};
 
 use crate::ParsingErrors;
@@ -250,6 +251,12 @@ impl PartialEq for Epoch {
     }
 }
 
+impl Hash for Epoch {
+    fn hash<H: Hasher>(&self, hasher: &mut H) {
+        self.duration_since_j1900_tai.hash(hasher);
+    }
+}
+
 impl PartialOrd for Epoch {
     fn partial_cmp(&self, other: &Self) -> Option<Ordering> {
         Some(

src/timescale.rs

@@ -52,7 +52,7 @@ pub const UNIX_REF_EPOCH: Epoch = Epoch::from_tai_duration(Duration {
 });
 
 /// Enum of the different time systems available
-#[derive(Copy, Clone, Debug, PartialEq, Eq)]
+#[derive(Copy, Clone, Debug, PartialEq, Eq, Hash)]
 #[cfg_attr(feature = "python", pyclass)]
 #[cfg_attr(feature = "serde", derive(Serialize, Deserialize))]
 pub enum TimeScale {