Thread: databse iterator probs

I am using the #include<list>
header with the following declaration of a databaseclass
for my employees, which will be read by an iterator class.

The abstract base class has 2 pure virtual functions both of which are overloaded in derived classes...
then i declare my list and databse but i am getting errors that i cannot seem to break

Code:

employee1.cpp
c:\program files\microsoft visual studio\vc98\include\list(29) : error C2259: 'employee' : cannot instantiate abstract class due to following members:
        C:\Program Files\Microsoft Visual Studio\MyProjects_M\Mcd_Project\employee1.cpp(43) : see declaration of 'employee'
        C:\Program Files\Microsoft Visual Studio\MyProjects_M\Mcd_Project\employee1.cpp(214) : see reference to class template instantiation 'std::list<class employee,class std::allocator<class employee> >' being compiled
c:\program files\microsoft visual studio\vc98\include\list(29) : warning C4259: 'void __thiscall employee::print(void)' : pure virtual function was not defined
        C:\Program Files\Microsoft Visual Studio\MyProjects_M\Mcd_Project\employee1.cpp(51) : see declaration of 'print'
        C:\Program Files\Microsoft Visual Studio\MyProjects_M\Mcd_Project\employee1.cpp(214) : see reference to class template instantiation 'std::list<class employee,class std::allocator<class employee> >' being compiled
c:\program files\microsoft visual studio\vc98\include\list(29) : warning C4259: 'double __thiscall employee::pay(void)' : pure virtual function was not defined
        C:\Program Files\Microsoft Visual Studio\MyProjects_M\Mcd_Project\employee1.cpp(52) : see declaration of 'pay'
        C:\Program Files\Microsoft Visual Studio\MyProjects_M\Mcd_Project\employ

there are 4 errors 6 warnings...and some of them point to the STL list file.
anyhow here is the syntax that is my problem..can anyone help me?

Code:

typedef list< employee > EMPLOYEE_LIST;
typedef EMPLOYEE_LIST::iterator LISTiterator;
 
class Employee_Database 
{
public:

Employee_Database( const char* filename); 
~Employee_Database();
EMPLOYEE_LIST dataList;
char databaseFilename[256];
char dataInputFilename[256];

 void showEmployeeMenu();
 void getMenuSelection();
 void Run( char* filename ); 
private:
 void Hire();
 void Fire();
 void Retire();
};
 
//database constructor
Employee_Database::Employee_Database( char* filename)
{

strcpy( databaseFilename, filename);
strcpy( dataInputFilename, "" );
dataList.clear();
 
 
}

If employee is an abstract base class, that is it has a pure virtual function, then you cannot have a list of employee's. You can have a list of pointers to employee's that point to decendants of employee that have no pure virtual functions.