Unresolved external symbol error for overloaded constructor

Question

Actually I've been searching my error and i found tons of solutions but they couldn't fix my problem and probably this is easy but i can't handle...

/* header */
class EmployeeRegister
{
private:
    EmpReg *Emp;
public:
    EmployeeRegister(int,int);
};


/* cpp file*/
EmployeeRegister::EmployeeRegister(int a,int b)
{
    cout << "Result  : " << a+b << endl;
}


/* in main file*/
EmployeeRegister Sub(1,1);

and when i do this or something like this i get :

main.obj:-1: error: LNK2001: unresolved external symbol "public: 
   __thiscall EmployeeRegister::EmployeeRegister(int,int)" 
   (??0EmployeeRegister@@QAE@HH@Z)

Actually I'm sure this is easy but what am I missing ?

EDIT : It's fixed , linker couldn't find my .cpp file.

Are you sure you've added the .cpp file to the project, so the linker finds it? — pts, Jun 27 '14 at 13:26
@SashaVolkoff: Please explain what IDE and what compiler you use, how you initiate the compilation (build) of the project. — pts, Jun 27 '14 at 13:34
There is a [faq entry](http://stackoverflow.com/q/12573816/1782465) for this. — Angew is no longer proud of SO, Jun 27 '14 at 14:47

score 2 · Accepted Answer · answered Jun 27 '14 at 13:28

2

Make sure your non-main .cpp file is listed in the project (or in linker command-line) so that it can be properly linked with your main.cpp

answered Jun 27 '14 at 13:28

YePhIcK

5,816
2
27
52

score 1 · Answer 2 · answered Jun 27 '14 at 13:38

1

As you are a newbie,

Please mention how do you build the project. You should compile both main.cpp and EmployeeRegister.cpp and link both main.o and EmployeeRegister.o files.

g++ -c Main.cpp g++ -c EmployeeRegister.cpp g++ -o binaryname Main.o EmployeeRegister.o

answered Jun 27 '14 at 13:38

Sujith Gunawardhane

1,251
1
10
24

1

This should be a comment, not an answer. – KjMag Jun 27 '14 at 13:43

Unresolved external symbol error for overloaded constructor

2 Answers2