add some const qualifiers to the methods from MobileRobot

Author: toeklk

orocos_bfl/examples/mobile_robot.cpp

@@ -91,14 +91,14 @@ namespace BFL
     }
 
 
-    ColumnVector
+    const ColumnVector
     MobileRobot::Measure()
     {
       return _meas_model->Simulate(_state);
     }
 
 
-    ColumnVector
+    const ColumnVector
     MobileRobot::GetState()
     {
       return _state;

orocos_bfl/examples/mobile_robot.h

@@ -52,8 +52,8 @@ namespace BFL{
       ~MobileRobot();
 
       void Move(MatrixWrapper::ColumnVector inputs);
-      MatrixWrapper::ColumnVector Measure();
-      MatrixWrapper::ColumnVector GetState(); //method only for simulation purposes
+      const MatrixWrapper::ColumnVector Measure();
+      const MatrixWrapper::ColumnVector GetState(); //method only for simulation purposes
 
     private:
       Gaussian* _system_Uncertainty;