How to integrate with other projects?

[mochechan]

I'm attempting to integrate OATPP with my project, but no success so far.
The reason should be that I'm not familiar with OATPP.

My evaluations are described as follows:

Evaluation 1: in the test/ folder

Insert #include "xalpr.hpp" here.

In the function int main() , insert the code:

  xalpr XALPR;
  XALPR.init();
  XALPR.recognize("");

Where the xlapr is a class. The result fits my expectation. It seems that the CMakeLists.txt has necessary modifications.

Evaluation 2: in the src/controller/ folder

With corresponding to the Evaluation 1, the CMakeLists.txt has some necessary modifications.
Insert #include "xalpr.hpp" here.

In the constructor MyController, insert the code:

  xalpr XALPR;
  XALPR.init();
  XALPR.recognize("");

When make, the following errors appear:

In file included from /home/xalpr/src/controller/MyController.cpp:1:
/home/xalpr/src/controller/MyController.hpp: In constructor ‘MyController::MyController(std::shared_ptr<oatpp::data::mapping::ObjectMapper>&)’:
/home/xalpr/src/controller/MyController.hpp:37:5: error: ‘xalpr’ was not declared in this scope
   37 |     xalpr XALPR;
      |     ^~~~~
/home/xalpr/src/controller/MyController.hpp:38:5: error: ‘XALPR’ was not declared in this scope
   38 |     XALPR.init();
      |     ^~~~~
make[2]: *** [CMakeFiles/my-project-lib.dir/build.make:76: CMakeFiles/my-project-lib.dir/src/controller/MyController.cpp.o] Error 1
make[1]: *** [CMakeFiles/Makefile2:113: CMakeFiles/my-project-lib.dir/all] Error 2
make: *** [Makefile:101: all] Error 2

Note: Please ignore line numbers due to the code has some modifications.
Question: How to solve this problem?

Evaluation 3: in the src/controller/ folder

Pending due to the Evaluation 2 is not yet solved.
The goal is that each ENDPOINT can call the function XALPR.recognize(""). Helpful tips are welcome. Thanks a lot.