typedef struct ALLEGRO_HAPTIC_EFFECT_ID ALLEGRO_HAPTIC_EFFECT_ID;
This struct is used as a handle to control playback of a haptic effect and should be considered opaque. Its implementation is visible merely to allow allocation by the users of the Allegro library.
[Unstable API]: Perhaps could be simplified due to limited support for all the exposed features across all of the platforms. Awaiting feedback from users.