Thread: Undefined Error

I seem to have a problem with my code, anytime I try to initialize the constructor PlaneList I recieve a not defined error. It shouldn't be because PlaneList.h is included. Assignment is due in hours and spent several just with this compile bug.

What I find weird is my EventList(which is similar toPlaneList, and extends OrderedList) works perfectly fine, with a call to the constructor almost identical.


Any foolish things I'm doing wrong?


Undefined first referenced
symbol in file
PlaneList::PlaneList(void) /var/tmp/ccjIE1oK.o
ld: fatal: Symbol referencing errors. No output written to a.out
collect2: ld returned 1 exit status

Code:

// CLASS: Simulation Header
//
// REMARKS: constrols all simulation related things - many static variables
//
// INPUT: none
//
// OUTPUT: none
//
//-----------------------------------------

#ifndef SIMULATION_H
#define SIMULATION_H
class Queue;
class EventList;
class PlaneList;

using namespace std;


class Simulation
{
	private:
		//variables describing current status of the simulation
		//these are altered by events (planes arriving and
		//leaving), including flags for runway status
		static int planesOnGround;
		static bool isLandRunwayFree;
		static bool isTakeoffRunwayFree;


	public:

		//queues for landing and departing flights!
		static Queue* landingQ;
		static Queue* takeoffQ;

		//also need a list of planes and a list of events
		static EventList* eventList;
		static PlaneList* planeList;

		//parameters for the simulation, things we might want
		//to change in future runs
		//you should always think ahead and try to parameterize
		//things!
		static const int MAX_PLANES=4; //max # planes on ground @ once
		static const int LANDING_DELAY=5; //time delay for landing op
		static const int TAKEOFF_DELAY=5; //time delay for takeoff op


		//methods to alter the state of the simulation

		//planesUp: increase the number of planes indicated
		//as being on the ground.
		static void planesUp();

		//planesDown: decrease the number of planes indicated
		//as being on the ground.
		static void planesDown();

		//return the number of planes currently on the ground
		static int getPlaneCount();

		//access methods for runway flags: two for retrieving
		//their values, and methods that allow us to set and clear
		//each of these flags.
		static bool landRunwayFree();
		static bool takeoffRunwayFree();
		static void setLandRunwayOccupied();
		static void setLandRunwayFree();
		static void setTakeoffRunwayOccupied();
		static void setTakeoffRunwayFree();

};


#endif
//---------------------------------------------------------------
// CLASS: Simulation
//
// REMARKS: methods and initializer for static values
//
// INPUT: none
//
// OUTPUT: none
//
//-----------------------------------------

#include<iostream>
#include "Simulation.h"
#include "PlaneList.h"
#include "Queue.h"
#include "EventList.h"

	int Simulation::planesOnGround = 0;
	bool Simulation::isLandRunwayFree = true;
	bool Simulation::isTakeoffRunwayFree = true;

	PlaneList* Simulation::planeList = new PlaneList();
	EventList* Simulation::eventList = new EventList();
	Queue* Simulation::landingQ = new Queue();
	Queue* Simulation::takeoffQ = new Queue();



	//planesUp: increase the number of planes indicated
	//as being on the ground.
	void Simulation::planesUp()
	{
		Simulation::planesOnGround++;
	}

	//planesDown: decrease the number of planes indicated
	//as being on the ground.
	void Simulation::planesDown()
	{
		Simulation::planesOnGround--;
	}

	//return the number of planes currently on the ground
	int Simulation::getPlaneCount()
	{
		return Simulation::planesOnGround;
	}

	//access methods for runway flags: two for retrieving
	//their values, and methods that allow us to set and clear
	//each of these flags.
	bool Simulation::landRunwayFree()
	{
		return isLandRunwayFree;
	}

	bool Simulation::takeoffRunwayFree()
	{
		return isTakeoffRunwayFree;
	}

	void Simulation::setLandRunwayOccupied()
	{
		isLandRunwayFree = false;
	}

	void Simulation::setLandRunwayFree()
	{
		isLandRunwayFree = true;
	}

	void Simulation::setTakeoffRunwayOccupied()
	{
		isTakeoffRunwayFree = false;
	}

	void Simulation::setTakeoffRunwayFree()
	{
		isTakeoffRunwayFree = true;
	}
//---------------------------------------------------------------
// CLASS: PlaneList header
//
// REMARKS: list of planes
//
// INPUT: none
//
// OUTPUT: none
//
//-----------------------------------------

#ifndef PLANELIST_H
#define PLANELIST_H

#include "OrderedList.h"

class Object;

using namespace std;

class PlaneList : public OrderedList
{
	private:

	public:
		PlaneList()
		{
			setFirst(NULL); //empty list to start!
		};

		bool smaller(Object* listItem, Object* newData);
};

#endif




// CLASS: PlaneList
//
// REMARKS: abstract smaller method PlaneList must use
//
// INPUT: objects smaller is comparing
//
// OUTPUT: none
//
//-----------------------------------------

#include <iostream>
#include "PlaneList.h"
#include "Plane.h"
#include "Simulation.h"




bool smaller(Object* listItem, Object* newData)
{
	//is the listItem smaller than the new data?
	//the abstract list these are from is a list of Objects, so
	//we need to cast them back to Planes.

	bool result;
	//plane 1 is smaller than plane 2 if it has a lower flight number

	if ( ((Plane*) listItem)->getFlightNum() < ((Plane*) newData)->getFlightNum() )
		result=true;
	else
		result= false;
	return result;
}