Merge pull request #50 from A-Manning/ash/sum-trait

impl core::iter::Sum for Scalar
zkcrypto · Oct 20, 2020 · 080eaa7 · 080eaa7
2 parents 8fe77da + faf7abc
commit 080eaa7
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/src/scalar.rs b/src/scalar.rs
@@ -774,6 +774,18 @@ impl PrimeField for Scalar {
     }
 }
 
+impl<T> core::iter::Sum<T> for Scalar
+where
+    T: core::borrow::Borrow<Scalar>,
+{
+    fn sum<I>(iter: I) -> Self
+    where
+        I: Iterator<Item = T>,
+    {
+        iter.fold(Self::zero(), |acc, item| acc + item.borrow())
+    }
+}
+
 #[test]
 fn test_inv() {
     // Compute -(q^{-1} mod 2^64) mod 2^64 by exponentiating