[Jsbsim-devel] [BUG] Failed to tie property xyz after reset in FlightGear

[Torsten D. <To...@t3...>]

There is a bug in FGFCS.cpp that shows up after a reset of JSBSim in 
FlightGear.
If you use a component hat has a name with an absolute path, the 
PropertyManager fails to tie this property to object methods after reset, 
because it is allready tied.

Example: 
<switch name="/foo">
  <default value="0.0">
  <test value="1.0">
    something gt 0
  </test>
</switch>

failes to Tie property /foo after a reset. Using relative paths is no problem.
I think the bug showed up, when the reset feature in JSBSim was implemented.

The problem is easy to fix: do a conditional Untie() before performing the 
Tie(). Here is a patch against latest FlightGear cvs:

Index: FGFCSComponent.cpp
===================================================================
RCS 
file: /var/cvs/FlightGear-0.9/source/src/FDM/JSBSim/models/flight_control/FGFCSComponent.cpp,v
retrieving revision 1.5
diff -u -p -r1.5 FGFCSComponent.cpp
--- FGFCSComponent.cpp  10 Jul 2008 17:23:04 -0000      1.5
+++ FGFCSComponent.cpp  24 Apr 2009 09:54:24 -0000
@@ -205,6 +205,7 @@ void FGFCSComponent::bind(void)
   } else {
     tmp = Name;
   }
+  if( PropertyManager->isTied( tmp ) ) PropertyManager->Untie( tmp );
   PropertyManager->Tie( tmp, this, &FGFCSComponent::GetOutput);
 }


Greetings, Torsten