[cfe-dev] making Subengine optional in GRState

[Olaf Krzikalla]

Hi Ted,

a while ago we already talked about making Subengine optional im 
GRStateManager. Back then I didn't want to have you commit the changes 
because I didn't know yet if it helps me. Now I safely can answer that 
question with "yes". In addition, due to all the recent directory 
movements I had some trouble to keep on track with my changes. So, 
please, if nothing else stands against it, can you commit the attached 
patch?

One discussable point is the added GRStateManager ctor. We could use the 
ConstraintManagerCreator function there too, but only if we change the 
signature of that function from SubEngine& to SubEngine*.
I don't see any other obstacles.


Best regards
Olaf Krzikalla
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