Linking .h file with .cpp file

Asked Jul 11 '16 at 14:13

Active Jul 11 '16 at 14:13

Viewed 36 times

I have a very simple test_planner.h file:

class TestPlanner
{
public:
 double GetTheSum(double n1, double n2) {return n1 + n2;}
};

which works well when I call the function "GetTheSum" from GoogleTest.

Now I want to split this file to a .h and a .cpp file.

test_planner.h:

class TestPlanner
{
public:
 double GetTheSum(double n1, double n2);
};

and a respective test_planner.cpp file in the same folder:

#include "test_planner.h"

double TestPlanner::GetTheSum(double n1, double n2)
{
  return n1 + n2;
}

If I run the same GoogleTest now I receive an error message to an "undefined reference to `TestPlanner::GetTheSum(double, double)'". I think my mistake must be in the linking of the two files but I cannot figure out what I did wrong. The problem is even to simple to find similar problems in the Q&A search.

asked Jul 11 '16 at 14:13

dakibot

Which compiler are you using? You need to link the *.cpp file. – Mattia F. Jul 11 '16 at 14:15
The problem isn't the header file or or its "linking", it's that you don't build with the *source* file `test_planner.cpp`. – Some programmer dude Jul 11 '16 at 14:16
specifically [this](http://stackoverflow.com/a/12574400/4342498) answer. – NathanOliver Jul 11 '16 at 14:16
Do you have a header guard in your .h file? – paweldac Jul 11 '16 at 14:17
I use gcc compiler in version 4.8.4 and yes, I tried to use header guards but this made no differences – dakibot Jul 11 '16 at 14:25
unfortunately I don't understand the answer which is linked by NathanOliver. So I somehow have to include those files in the building process but how do I do that. I use CMakeLists – dakibot Jul 11 '16 at 14:40

Linking .h file with .cpp file

0 Answers0