Help! Undefined Reference

[halo3]

Hi guys.
I am current facing an annoying problem. I have written the following classes:

#ifndef _EMPLOYEE_H
#define _EMPLOYEE_H

#include <string>

using namespace std;

class Employee {
public:
  Employee(string theName, float thePayRate);

  string getName() const;
  float getPayRate() const;

  float pay(float hoursWorked) const;

protected:
  string name;
  float payRate;
};

#endif /* not defined _EMPLOYEE_H */

#include "employee.h"

using namespace std;
int main(){}

Employee::Employee(string theName, float thePayRate)
{
  name = theName;
  payRate = thePayRate;
}

string Employee::getName() const
{
  return name;
}

float Employee::getPayRate() const
{
  return payRate;
}

float Employee::pay(float hoursWorked) const
{
  return hoursWorked * payRate;
}

#ifndef _MANAGER_H
#define _MANAGER_H
#include <string>
#include "employee.h"

using namespace std;

class Manager : public Employee {
public:
  Manager(string theName,float thePayRate,bool isSalaried);

  bool getSalaried() const;

  float pay(float hoursWorked) const;

protected:
  bool salaried;
};

#endif /* not defined _MANAGER_H */

#include "manager.h"

using namespace std;

int main(){}
Manager::Manager(string theName,float thePayRate,bool isSalaried): Employee(theName, thePayRate)
{
  salaried = isSalaried;
}

bool Manager::getSalaried() const
{
  return salaried;
}

float Manager::pay(float hoursWorked)
{
  if (salaried)
    return payRate;
  /* else */
  return Employee::pay(hoursWorked);
}

I have tried to compile manager.cpp many times in Dev C++ 4.9.9.2 but the message are always:

  [Linker error] undefined reference to `Employee::Employee(std::string, float)' 
  [Linker error] undefined reference to `Employee::Employee(std::string, float)' 
   [Linker error] undefined reference to `Employee::pay(float) const' 
  ld returned 1 exit status

Can anyone help me?Thank you in advance =)

[laserlight]

It sounds like you did not link the object file generated from the source file with the definition of the Employee constructor.

[Carola]

I've got a similar problem,
How do you link them?

cheers, Carola

[laserlight]

Oh, if you are using Dev C++ 4.9.9.2 then you should create a project and place your files in that project. The same applies to some other IDEs.

[halo3]

Should I put it as a Window Application, Console Application or an Empty Project.
And how to link employee class and manager class.

[laserlight]

Either Console Application or an Empty Project would probably be correct for you. The IDE would get the linking done for you.

[halo3]

OMG, I can do it now. Thank you very much laserlight.

[Carola]

I'm using Code::Blocks with MinGW,
Everything's within one project already,
but for some reason it doesn't work.

[hk_mp5kpdw]

#ifndef _EMPLOYEE_H
#define _EMPLOYEE_H


#ifndef _MANAGER_H
#define _MANAGER_H

From C-FAQ:

The rules, paraphrased from ANSI Sec. 4.1.2.1, are:

* 1. All identifiers beginning with an underscore followed by an upper-case letter or another underscore are always reserved (all scopes, all namespaces).

[Elysia]

I'm using Code::Blocks with MinGW,
Everything's within one project already,
but for some reason it doesn't work.

Then there may be another reason. Perhaps you haven't implemented the functions? Code?

[bithub]

I think it's safe to say that both of your source files are not getting linked. If they were, you would be getting an error complaining that main() has been defined more than once. You have main() implemented in employee.cpp and manager.cpp.