SWIG [C ++ to Lisp (CFFI)] error while wrapping compilation

Question

I start with the interface between C ++ and Lisp with SWIG. I am following the SWIG documentation, but I am having a problem. Here is a simple program I want to interact with (it can be easily done in Lisp, but it must understand how to import C ++ code into Lisp):

test.cpp:

#include "test.hpp"
int test(int x, int y) {
   std::cout << x+y;
   return 0;
}

test.hpp:

#include <iostream>
int test(int x, int y);

To use SWIG, I create an interface file:

test.i:

%module test
%include <test.hpp>

And I ran the following command line:

$ swig -c++ -cffi test.i 
$ c++ -c test_wrap.cxx

But when compiling test_wrap.cxx, the terminal says:

test_wrap.cxx:193:19: error: use of undeclared identifier 'test'
result = (int)test(arg1,arg2);
              ^
1 error generated. 

Can anybody help me?

Answer 1

Here is a modified test.ione that compiles the rest:

%module test
%{
#include "test.hpp"
%}

%include <test.hpp>

(. 24) , , include .