Thread: Pointing to a Queue of Pointers?

I'm trying to have a pointer point to teh first object in a Queue of Objects so I can move it to a Map but I'm getting odd errors. Car and Date are classes I've created, but Date has nothing to do with Car assignments so I don't understand the error codes.

Date.h

Code:

#include"date.h"
typedef enum {NA, available, service, rented, junked} status;
class Car
{
	private:
	string plate;
	status stat;
	int mileage;
	int lastServiceMileage;
	Date outDate;/*date rented*/
	Date inDate;/*date due back*/
	
	public:
	Car(string lic="", unsigned miles=0)
	{
		plate=lic;
		mileage=miles;
		stat=NA;
	}
	
	string getPlate()
	{
		return plate;
	}
	
	int getMile()
	{
		return mileage;
	}
	
	bool operator==(const Car &car2)
	{
		return(plate==car2.plate);
	}
	
	bool operator<(const Car &car2)const
	{
		return(plate<car2.plate);
	}
	
	int mileageCompareTo(const Car &car2)const
	{
		return(mileage-car2.mileage);
	}
	
	string convertStatus()const
	{
		/*NA, available, service, rented, junked*/
		switch(stat)
		{
			case NA: return "NA";
				break;
			case available: return "available";
				break;
			case service: return "service";
				break;
			case rented: return "rented";
				break;
			case junked: return "junked";
				break;
			default: return "NA";
				break;
		}
	}
	
	void chStat(string sta)
	{
		if(sta=="NA") stat=NA;
		if(sta=="available") stat=available;
		if(sta=="service") stat=service;
		if(sta=="rented") stat=rented;
		if(sta=="junked") stat=junked;
	}
};

Car.h

Code:

#if !defined Date_h
#define Date_h
#include <iostream>
#include <string>
using std::string;
using std::cout;
using std::cin;
using std::ostream;
using std::istream;
class DateException{
//Note really should write display member function and insertion operator helper function
public:
	string message;
	DateException(const string & msg = ""){message = msg;}
};

class Date { //does note need copy constructor or assignment operator WHY?
   public :
      Date(int month = 1, int day =1, int year = 2001);
      void setDate(int month = 1, int day =1, int year = 2000) throw (DateException);
      void setDay(int day)throw (DateException);
      void setMonth(int month)throw (DateException);
      void setYear(int year)throw (DateException);
	  Date operator ++(int) ;              //Notice new operation
      int day()const {return _day;}
      int year()const {return _year; }
      int month()const {return _month; }
      void display(ostream & out = cout)const; //  month/day/year format no \n
      void input(istream & in = cin); //   month/day/year format
      bool operator == ( const Date & d2)const;
      bool operator < ( const Date & d2)const ;
	  bool operator > (const Date & d2) const ;
   protected:
      int _month;
      int _day;
      int _year;
 } ;

//helper functions

bool operator != (const Date & d1, const Date & d2) ;

ostream & operator << (ostream & out, const Date & d1) ;

istream & operator >> (istream & in,  Date & d1) ;
// tests if year is a leap year
bool leapYearTest(int year) ;
// a crutial piece of information -- the number of days in a month
// returns int value
int maxNumDaysinMonth(int the_month, int the_year);

//compute the difference in days between two dates
//Be sure to check which is smaller -- d1 or d2
   int difference(const Date &d1, const Date &d2);

// checks if a date is a valid one.
   bool isValid (Date d);
#endif // !defined Date_h

Main.cpp

Code:

#include"car.h"
#include<map>   /**/
#include<queue> /*cars being serviced*/

void list();

int main()
{
	string command;
	int day,month,year,mileage;
	string lic;
	//Date current;
	std::map<string,Car*> ourCars;
	std::multimap<string,Car*> available4Rent;
	std::queue<Car*> toBeServiced;
	Car * ca;
	while(command!="quit")
	{
		list();
		cout<<"Please enter command: ";
		cin>>command;
		
		if(command=="setdate")
		{
			cin>>day>>month>>year;
			//current.setDate(month, day, year);
		}
		if(command=="new")
		{
			cin>>lic>>mileage;
			ca=new Car(lic,mileage);
			ourCars.insert(std::pair<string,Car*>(lic,ca));
			(*ca).chStat("service");
			toBeServiced.push(ca);
		}
		if(command=="serviced")
		{
			ca=toBeServiced.front();
			(*ca).chStat("available");
			available4Rent.insert(std::pair<string,Car*>((*ca).getPlate(), ca));
			toBeServiced.pop();
		}
		
	}
	return 0;
}

void list()
{
	cout<<"setdate mm dd yyyy \n";
	cout<<"new 'license plate' 'mileage' \n";
	cout<<"serviced \n";
	cout<<"list\n";
	cout<<"available\n";
	cout<<"rent mm/dd/yy\n";
	cout<<"return 'license plate' 'current mileage'\n";
	cout<<"rented\n";
	cout<<"due\n";
	cout<<"when 'license plate'\n";
	cout<<"overdue\n";
	cout<<"rentcar 'license plate' 'date of return'\n";
	cout<<"junk 'license plate'\n";
	cout<<"listjunked\n";
	cout<<"summary 'license plate'\n";
	cout<<"quit\n";
}

Errors:
H:\Program>gpp -Wall rent.cpp
c:/djgpp/tmp/ccDXn05B.o(.text+0xcc):rent.cpp: undefined reference to `Date:ate
[in-charge](int, int, int)'
c:/djgpp/tmp/ccDXn05B.o(.text+0x24e):rent.cpp: undefined reference to `Date::set
Date(int, int, int)'
c:/djgpp/tmp/ccDXn05B.o(.gnu.linkonce.t._ZN3CarC1ESsj+0x26):ren t.cpp: undefined
reference to `Date:ate[in-charge](int, int, int)'
c:/djgpp/tmp/ccDXn05B.o(.gnu.linkonce.t._ZN3CarC1ESsj+0x3e):ren t.cpp: undefined
reference to `Date:ate[in-charge](int, int, int)'
collect2: ld returned 1 exit status

Your errors suggest a problem with the Date class, not with your queue of pointers to Car. Are you sure that you gave the Date::Date and Date::set member functions bodies?

Yes, they have bodies. I figured it out, my exception handling was causing errors. Thanks for the help and direction to my faulty Date class!