autopilot: Introduce virtual dtor.

Introduce a virtual destructor to make deleting
FunctorBase instances ComponentForge::~ComponentForge
work reliable.

diff --git a/src/Autopilot/functor.hxx b/src/Autopilot/functor.hxx
index 2f1ac36dfa2f18d8276248cc8f26fca09a184ba3..4b1fda6f0a0bf89ee800483f2a36dfe734920097 100644 (file)
--- a/src/Autopilot/functor.hxx
+++ b/src/Autopilot/functor.hxx
@@ -31,6 +31,7 @@ namespace FGXMLAutopilot {
 
 template <class TBase> class FunctorBase {
 public:
+  virtual ~FunctorBase() {}
   virtual TBase * operator()( SGPropertyNode_ptr configNode ) = 0;
 };