utils_api.h:

int (* add)(int a, int b);
int (* sub)(int a, int b);
void (* print)(const char*);
float(* div)(float a, float b);

utils_wrap.h
X(add)
X(sub)
X(print)
X(float)

main.cpp:

#include <iostream>
#include <dlfcn.h>
#include "utils_api.h"
int main(){
void *hndl = dlopen ("utils.so", RTLD_LAZY);
// Pull the API.
#define X(N)                                    \
N = (typeof (N))dlsym(hndl, #N);   \
if (N == 0)                                   \
  std::cout << ("Missing API " #N " in DLL.");
  #include "utils_wrap.h"
#undef X

return 0;
}