비동기 C 드라이버: 공개 미리 보기

#include <amongoc/amongoc.h> // Make all APIs visible
#include <stdio.h>
#include <stdlib.h>
amongoc_box on_connect(amongoc_box userdata, amongoc_status *status, amongoc_box result);
int main(void)
{
   amongoc_loop loop;
   amongoc_status status = amongoc_default_loop_init(&loop);
   amongoc_if_error(status, msg)
   {
      fprintf(stderr, "Failed to prepare the event loop: %s\n", msg);
      return 2;
   }
   // Initiate a connection
   amongoc_emitter em = amongoc_client_new(&loop, "mongodb://localhost:27017");
   // Set the continuation
   em = amongoc_then(em, &on_connect);
   // Run the program
   amongoc_detach_start(em);
   amongoc_default_loop_run(&loop);
   // Clean up
   amongoc_default_loop_destroy(&loop);
   return 0;
}
amongoc_box on_connect(amongoc_box userdata, amongoc_status *status, amongoc_box result)
{
   // We aren't using the userdata for this example.
   (void)userdata;
   // Check for an error
   amongoc_if_error(*status, msg)
   {
      fprintf(stderr, "Error while connecting to server: %s\n", msg);
   }
   else
   {
      printf("Successfully connected!\n");
      amongoc_client *client;
      amongoc_box_take(client, result);
      // `client` now stores a valid client. We don't do anything else, so just delete it:
      amongoc_client_delete(client);
   }
   amongoc_box_destroy(result);
   return amongoc_nil;
}