Virtual and inheritance, can't find the problem

Hi, I get an "undefined reference to `vtable for controlSystem'" when compiling the following code. I can't find the problem, I thought that this compiler message appeared when you forgot to implement a virtual member, but i think it's not my case.

Thanks in advance.

Code:

---

class controlSystem {
        protected:
                byte varNumber;
                byte varSize;
       
        public:
                controlSystem();
                byte iBL (unsigned int value);
                byte iBH (unsigned int value);
                unsigned int b2I(byte bH, byte bL);
                virtual unsigned int calculateOutput (unsigned int fullStatus[17]);
                virtual void sensorUpdate (unsigned int lastValue[16], unsigned int newValue[16]);
                virtual void saveEEPROM(unsigned int position);
                virtual void initializeEEPROM(unsigned int position);
                virtual void loadEEPROM(unsigned int position);
                };
/*fin de control System e inicio de thresholdSystem*/

class thresholdSystem : public controlSystem {
private:
  unsigned int _threshold[16];
  unsigned int _valueObj[16];
  boolean _isrising[16];
  unsigned int _active;

protected:

public:
  thresholdSystem();
  void saveEEPROM (unsigned int position);
  void initializeEEPROM (unsigned int position);
  void loadEEPROM (unsigned int position);
  unsigned int calculateOutput (unsigned int [17]);
  void sensorUpdate (unsigned int [16], unsigned int [16]);
};

---------------------------
byte controlSystem::iBL (unsigned int value) {
...
}

byte controlSystem::iBH (unsigned int value) {
...
}

unsigned int controlSystem::b2I(byte bH, byte bL) {
...
}

controlSystem::controlSystem () {
  int a=0;
}


thresholdSystem::thresholdSystem () {
  ...
}

//Cambiar código para coger dirección por parámetro

void thresholdSystem::loadEEPROM (unsigned int position) {
  ...
}

void thresholdSystem::saveEEPROM (unsigned int position) {
  ...
}

void thresholdSystem::initializeEEPROM (unsigned int position) {
  ...
}

unsigned int thresholdSystem::calculateOutput (unsigned int fullStatus[17]) {
  ...
}

void thresholdSystem::sensorUpdate (unsigned int lastValue[16], unsigned int newValue[16]){
  ...
}

---

Where are the implementations for controlSystem?

If you don't want to provide implementations for controlSystem, make the virtual functions pure virtuals.

It's in the code, isn't it?

Code:

---

controlSystem::controlSystem () {
  int a=0;
}

---

Anyways, to make it pure virtual (the constructor) should I put

Code:

---

controlSystem::controlSystem() = 0 {}

---

or should I make the entire class virtual?

Quote:

---

Originally Posted by scarnia

It's in the code, isn't it?

Code:

---

controlSystem::controlSystem () {
  int a=0;
}

---

---

Quote:

---

Originally Posted by scarnia

Anyways, to make it pure virtual (the constructor) should I put

Code:

---

controlSystem::controlSystem() = 0 {}

---

or should I make the entire class virtual?

---

That's a constructor. Constructors can't be virtual (nor classes...)

No, I'm talking about:
virtual unsigned int calculateOutput (unsigned int fullStatus[17]);
virtual void sensorUpdate (unsigned int lastValue[16], unsigned int newValue[16]);
virtual void saveEEPROM(unsigned int position);
virtual void initializeEEPROM(unsigned int position);
virtual void loadEEPROM(unsigned int position);

I don't see their definition (implementation) for controlSystem.

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