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add some guards for nil pointers

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This commit is contained in:
Martin Kobetic 2014-06-24 15:30:28 +00:00
parent bbee09da30
commit 32e22b3bb6
1 changed files with 9 additions and 2 deletions
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11
db.go
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@ -575,8 +575,15 @@ type Stats struct {
// This is useful when obtaining stats at two different points and time and // This is useful when obtaining stats at two different points and time and
// you need the performance counters that occurred within that time span. // you need the performance counters that occurred within that time span.
func (s *Stats) Sub(other *Stats) Stats { func (s *Stats) Sub(other *Stats) Stats {
var diff Stats = *s var diff Stats
diff.TxN = other.TxN - s.TxN if s == nil {
return diff
}
diff = *s
if other == nil {
return diff
}
diff.TxN = other.TxN - diff.TxN
diff.TxStats = s.TxStats.Sub(&other.TxStats) diff.TxStats = s.TxStats.Sub(&other.TxStats)
return diff return diff
} }