system/PeriodClock: make IsDefined() "constexpr"

980187f8 · Max Kellermann · 327a8e6c · 980187f8
Commit 980187f8 authored Jun 20, 2015 by Max Kellermann
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PeriodClock.hxx src/system/PeriodClock.hxx +1 -1

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--- a/src/system/PeriodClock.hxx
+++ b/src/system/PeriodClock.hxx
@@ -63,7 +63,7 @@ protected:
  }

 public:
-  bool IsDefined() const {
+  constexpr bool IsDefined() const {
    return last != 0;
  }