Visual Studio Link Error When Including Headers from Another Directory

Short question: How can I use Visual Studio to create / compile / run source projects in different directories.

Here are the specific details:

I have a class definition file (.hpp) and an implementation file (.cpp) in one directory, and I have a main.cpp file in another directory. In Visual Studio 2008, I created a new project and placed main.cpp in this project. I added the class file directory to the additional Include directories (right-click on the project → project properties → Configuration properties - C / C ++ - General → Additional directories Include = C: \ Test \ cpp).

When I do this, intellisense works fine when editing main.cpp. When I create a project, it compiles fine, but I get link errors, such as:

error LNK2019: unresolved external symbol "public: int __thiscall Test :: add (int)" (? add @Test @@ QAEHH @Z) referenced by the _main function.

As far as I can tell, Visual Studio does not actually compile Test.cpp (I do not see any .obj files for it). I tried to compile it before compiling / building main.cpp, but that didn't make any difference. Is there any way around this? When I search the Internet for answers, I see that many people forget to include libraries for the linker, but I don't deal with any library.

, , Test.hpp Test.cpp , main.cpp, - . , , .

3 :

• C:\Test\CPP\Test.hpp

  #ifndef TEST_H
  #define TEST_H
  
  class Test
  {
  private:
    int mynum;
  
  public:
    Test();
    int add(int num);
  
  };
  #endif //TEST_H
  

• C:\Test\CPP\test.cpp

  #include "Test.hpp"
  
  Test::Test()
  {
    mynum = 0;
  }
  
  int Test::add(int num)
  {
    return mynum += num;
  }
  

• C:\ Visual Studio\MyProject\main.cpp

  #include <iostream>
  #include <Test\Test\Test.hpp>
  
  int main(int argc, char *argv[])
  {
    Test test;
    std::cout << "Add 5 = " << test.add(5) << std::endl;
    return 0;
  }