#ifndef __QUEUE__
#define __QUEUE__

#include <stdio.h>
#include <stdlib.h>

/**
 * @brief Queue structure => FIFO (First In First Out).
 * @since v1.0.0
 */
struct queue {
  struct queue_node *first;
  size_t length;
};

/**
 * @brief Queue node structure.
 * @since v1.0.0
 */
struct queue_node {
  void *data;
  struct queue_node *next;
};

/**
 * @brief Queue initialization.
 * @since v1.0.0
 */
struct queue *queue_initialization();

/**
 * @brief Push data to queue.
 * @since v1.0.0
 */
void queue_push(struct queue *queue, void *data);

/**
 * @brief Pop data from queue.
 * @since v1.0.0
 */
void *queue_pop(struct queue *queue);

#endif