LNK2001 with a vector function

Question

I am using C++ MVS2019 and trying to use a vector function declared in h. file and defined in a secondary .cpp file, but the code doesn't compile and throws me 2 errors:

1. Error    LNK1120 1 unresolved externals  library D:\VS_cpp\library\library\x64\Release\library.exe   1   
2. Error    LNK2001 unresolved external symbol "struct Vector<int> __cdecl Biblio::debtors(void)" (?debtors@Biblio@@YA?AU?$Vector@H@@XZ)    library D:\VS_cpp\library\library\library\library.obj   1

At the same time if I use the same code in Code Blocks it compiles perfectly. MAIN.cpp:

#include "test_int.h"
using namespace Biblio;
int main()
{
    vector<int> debtorss = debtors();
    int test = test_int();
}

test_int.h:

#ifndef BIBLIO_H_INCLUDED
#define BIBLIO_H_INCLUDED

#include <iostream>
#include <vector>
#include <string>
using namespace std;

namespace Biblio
{
    vector<int> debtors();
    int test_int();
}

#endif

test_int.cpp

#include <iostream>
#include <vector>
#include <string>
using namespace std;

namespace Biblio
{
    vector<int> debtors()
    {
        vector<int> abc{ 1,2,3 };
        return abc;
    }

    int test_int()
    {
        return 0;
    }
}

If I kill "debtors()" function in all files and compile just with "int test_int()" function - everything is fine. But any vector function causes the same error. Since it works in CodeBlocks it might be some Visual Studio settings that have to be changed but since I am just studying I don't know much.

Would be happy to get any advice. Thanks.

unrelated but you should avoid `using namespace std` in general and never use it in a header file — Alan Birtles, Sep 28 '20 at 20:44
Nothing to do with the vector, you need to link `test_int.obj` with your code, that's all. — πάντα ῥεῖ, Sep 28 '20 at 20:47
please also provide a [mre], your error message has `Vector` with a capital `V` which doesn't match your code — Alan Birtles, Sep 28 '20 at 20:48
My guess is the file `test_int.cpp` is not part of your project in Visual Studio 2019. Being in the same folder does not matter. It needs to be part of the project. — drescherjm, Sep 28 '20 at 20:53

LNK2001 with a vector function

0 Answers0