test.cc

// To compile this:
// g++ -lsafe_app test.cc

// Don't forget to put libsafe_app.so (or libsafe_app.dll, depending on your OS) with the source code.

#include <stdint.h>
#include <stdlib.h>
#include <iostream>

// https://docs.rs/ffi_utils/0.2.0/ffi_utils/struct.FfiResult.html
typedef struct {
  int err_code;
  char *description;
} FfiResult;

typedef void *AppPtr;

// https://docs.rs/safe_app/0.2.1/safe_app/ffi/fn.app_unregistered.html
extern "C" void app_unregistered(char *bootstrap_config_ptr,
                                 size_t bootstrap_config_len,
                                 void *network_cb_user_data,
                                 void *user_data,
                                 void (*o_network_observer_cb)(void *, FfiResult, int32_t),
                                 void (*o_cb)(void *, FfiResult, AppPtr));

int main() {
  // Create an unregistered app and provide callbacks as C++ anonymous functions
  app_unregistered(nullptr, 0, 0L, 0L, [](void *network_ud, FfiResult res, int32_t res_type) {
    std::cout << "Network event: " << res_type << std::endl;
  }, [](void *user_data, FfiResult res, AppPtr app_ptr) {
    if (res.err_code == 0) {
      std::cout << "Successfully created App handle" << std::endl;
    } else {
      std::cout << "Error: " << res.err_code << std::endl;	
    }
  });

  return 0;
}