Add Newer method to types.Vote

1 files changed, 6 insertions, 0 deletions

diff --git a/core/types/vote.go b/core/types/vote.go
index 8bb27c1..d935e7d 100644
--- a/core/types/vote.go
+++ b/core/types/vote.go
@@ -115,3 +115,9 @@ func (v *Vote) Clone() *Vote {
 		Signature: v.Signature.Clone(),
 	}
 }
+
+// Newer return true when the (position, period) of other vote is older than us.
+func (v Vote) Newer(other Vote) bool {
+	return v.Position.Newer(other.Position) ||
+		(v.Position.Equal(other.Position) && v.Period > other.Period)
+}