logic/track-logger: add virtual dtor to parent class

It's defined out-of-line so that vtable is emitted only once.

1 files changed, 1 insertions, 0 deletions

diff --git a/opentrack-logic/tracklogger.hpp b/opentrack-logic/tracklogger.hpp
index 65128d48..b4fcefc3 100644
--- a/opentrack-logic/tracklogger.hpp
+++ b/opentrack-logic/tracklogger.hpp
@@ -17,6 +17,7 @@ public:
     virtual void write(const char *)
     {
     }
+    virtual ~TrackLogger();
 
     virtual void write(const double *, int n)
     {