al_toggle_menu_item_flags - Allegro 5 API

       Toggles  the  specified  menu  item’s  flags.   See al_insert_menu_item(3alleg5) for a description of the
       available flags.

       Returns a bitfield of only the specified flags that are set after  the  toggle.   A  flag  that  was  not
       toggled will not be returned, even if it is set.  Returns -1 if the id is invalid.

       al_toggle_menu_item_flags - Allegro 5 API

al_get_menu_item_flags(3alleg5), al_set_menu_item_flags(3alleg5)

Allegro reference manual                                                      al_toggle_menu_item_flags(3alleg5)

       5.1.0

              [UnstableAPI]: Redundant with al_get/set_menu_item_flags.

              #include <allegro5/allegro_native_dialog.h>

              int al_toggle_menu_item_flags(ALLEGRO_MENU *menu, int pos, int flags)