Merge pull request #212 from Shopify/stats_sub

Improve Stats.Sub()
boltdb · Jun 24, 2014 · 78d08e0 · 78d08e0
2 parents c45c4a1 + 8dd18bd
commit 78d08e0
Showing 1 changed file with 12 additions and 0 deletions.
diff --git a/db.go b/db.go
@@ -576,6 +576,18 @@ type Stats struct {
 // you need the performance counters that occurred within that time span.
 func (s *Stats) Sub(other *Stats) Stats {
 	var diff Stats
+	if s == nil {
+		if other == nil {
+			return diff
+		} else {
+			return *other
+		}
+	}
+	diff = *s
+	if other == nil {
+		return diff
+	}
+	diff.TxN = other.TxN - diff.TxN
 	diff.TxStats = s.TxStats.Sub(&other.TxStats)
 	return diff
 }