#pragma once

#include <stdint.h>

typedef struct {
	uint8_t state; /* entered unchanged exited */
	uint8_t old_index;
	uint8_t new_index;
	uint64_t tracking_id;
} tracked_delta;

/* could also resort to TRANSIENT / PERSISTENT */
static const uint8_t TRACKED_DELTA_ENTERED = 0;
static const uint8_t TRACKED_DELTA_UNCHANGED = 1;
static const uint8_t TRACKED_DELTA_EXITED = 2;


void touch_events_sorted_ids_deltas( 
	tracked_delta **endbuffer, uint16_t *endcount, 
	uint64_t *previous_ids, uint8_t previous_count, 
	uint64_t *current_ids, uint8_t current_count
);