Added pure virtual function definitions and error handler to make com…

…mandline compile not complain

AeroQuad.h

@@ -367,4 +367,8 @@ float findMode(float *data, int arraySize); // defined in Sensors.pde
 int findMode(int *data, int arraySize); // defined in Sensors.pde
 #endif
 
+// Error handling of virtual functions of  Receiver and Motors base classes  
+extern "C" void __cxa_pure_virtual() { Serial.print("ERROR: Virtual function called! "); }
+
+
 

Motors.h

@@ -64,9 +64,9 @@ class Motors {
   };
 
   // The following function calls must be defined in any new subclasses
-  virtual void initialize(void);
-  virtual void write (void);
-  virtual void commandAllMotors(int motorCommand);
+  virtual void initialize(void) = 0;
+  virtual void write (void) = 0;
+  virtual void commandAllMotors(int motorCommand) = 0;
 
   //Any number of optional methods can be configured as needed by the SubSystem to expose functionality externally
   void pulseMotors(byte quantity) {

Receiver.h

@@ -33,7 +33,7 @@ class  Receiver {
   float bTransmitter[6];
   unsigned long currentTime, previousTime;
 
-  Receiver(void) { 
+  Receiver(void) {
     transmitterCommand[ROLL] = 1500;
     transmitterCommand[PITCH] = 1500;
     transmitterCommand[YAW] = 1500;
@@ -50,8 +50,8 @@ class  Receiver {
   // ******************************************************************
   // The following function calls must be defined in any new subclasses
   // ******************************************************************
-  virtual void initialize(void);
-  virtual void read(void);
+  virtual void initialize(void) = 0;
+  virtual void read(void) = 0;
 
   // **************************************************************
   // The following functions are common between all Gyro subclasses