toggle fullscreen: also adapt GUI plane when resizing

[flightgear.git] / src / Autopilot / digitalfilter.cxx

diff --git a/src/Autopilot/digitalfilter.cxx b/src/Autopilot/digitalfilter.cxx
index d3b55cb4d3b41ca599c7fdd93e20e8f017597e25..26377e13141b289635ca871e4103579e0b5c66fb 100644 (file)
--- a/src/Autopilot/digitalfilter.cxx
+++ b/src/Autopilot/digitalfilter.cxx
@@ -40,6 +40,7 @@ class DigitalFilterImplementation : public SGReferenced {
 protected:
   virtual bool configure( const std::string & nodeName, SGPropertyNode_ptr configNode) = 0;
 public:
+  virtual ~DigitalFilterImplementation() {}
   DigitalFilterImplementation();
   virtual void   initialize( double output ) {}
   virtual double compute( double dt, double input ) = 0;