Type Definition clingo_sys::clingo_propagator_undo_callback_t

type clingo_propagator_undo_callback_t = Option<unsafe extern "C" fn(arg1: *const clingo_propagate_control_t, arg2: *const clingo_literal_t, arg3: usize, arg4: *mut c_void) -> bool>;

! Typedef for @ref ::clingo_propagator::undo().