//
// Created by kubik on 7 lip 2018.
//
#pragma once
typedef struct node_t {
    int data;
    struct node_t *next;
} Node;

typedef struct linked_list_t {
    struct node_t *head;
    struct node_t *tail;
} List;

struct linked_list_t *ll_create();

int ll_push_back(struct linked_list_t *ll, int value);

int ll_push_front(struct linked_list_t *ll, int value);

int ll_pop_front(struct linked_list_t *ll, int *err_code);

int ll_pop_back(struct linked_list_t *ll, int *err_code);

int ll_back(const struct linked_list_t *ll, int *err_code);

int ll_front(const struct linked_list_t *ll, int *err_code);

struct node_t *ll_begin(struct linked_list_t *ll);

struct node_t *ll_end(struct linked_list_t *ll);

int ll_size(const struct linked_list_t *ll);

int ll_is_empty(const struct linked_list_t *ll);

int ll_at(const struct linked_list_t *ll, unsigned int index, int *err_code);

int ll_insert(struct linked_list_t *ll, unsigned int index, int value);

int ll_remove(struct linked_list_t *ll, unsigned int index, int *err_code);

void ll_clear(struct linked_list_t *ll);

void ll_display(const struct linked_list_t *ll);