typedef SDL_assert_state (SDLCALL *SDL_AssertionHandler)(

                                     const SDL_assert_data *, void *userdata);

 /**

  *  \brief Set an application-defined assertion handler.

  *

  *  This allows an app to show its own assertion UI and/or force the

  *  response to an assertion failure. If the app doesn't provide this, SDL

  *  will try to do the right thing, popping up a system-specific GUI dialog,

  *  and probably minimizing any fullscreen windows.

  *

  *  This callback may fire from any thread, but it runs wrapped in a mutex, so

  *  it will only fire from one thread at a time.

  *

  *  Setting the callback to NULL restores SDL's original internal handler.

  *

  *  This callback is NOT reset to SDL's internal handler upon SDL_Quit()!

  *

  *  \return SDL_assert_state value of how to handle the assertion failure.

  *  

  *  \param handler Callback function, called when an assertion fails.

  *  \param userdata A pointer passed to the callback as-is.

  */

 extern DECLSPEC void SDLCALL SDL_SetAssertionHandler(

                                             SDL_AssertionHandler handler,

                                             void *userdata);

 /**

  *  \brief Get a list of all assertion failures.

  *

  *  Get all assertions triggered since last call to SDL_ResetAssertionReport(),

  *  or the start of the program.

  *

  *  The proper way to examine this data looks something like this:

  *

  *  <code>

  *  const SDL_assert_data *item = SDL_GetAssertionReport();

  *  while (item->condition) {

  *      printf("'%s', %s (%s:%d), triggered %u times, always ignore: %s.\n",

  *             item->condition, item->function, item->filename,

  *             item->linenum, item->trigger_count,

  *             item->always_ignore ? "yes" : "no");

  *      item = item->next;

  *  }

  *  </code>

  *

  *  \return List of all assertions. This never returns NULL,

  *          even if there are no items.

  *  \sa SDL_ResetAssertionReport

  */

 extern DECLSPEC const SDL_assert_data * SDLCALL SDL_GetAssertionReport(void);

 /**

  *  \brief Reset the list of all assertion failures.

  *

  *  Reset list of all assertions triggered.

  *

  *  \sa SDL_GetAssertionReport

  */

 extern DECLSPEC void SDLCALL SDL_ResetAssertionReport(void);