VoidList - header file

// Definitions of specific types
typedef struct elem_t elem_t;
typedef struct list_t list_t;

// Specific functions for comparing elements
int compare_int(void *a, void *b);
int compare_string(void *a, void *b);

// Specific functions for copying elements
void *copyk_int(void *a);
void *copyk_string(void *a);

// Specific functions for printing a list
void print_int_list(elem_t *list);
void print_string_list(elem_t *list);

// Specific functions for creating brand new lists
list_t* create_int_list();
list_t* create_string_list();

/* Generic functions for inserting or extracting
elements from the lists, printing a list,
deallocate the heap and searching specific
elements into lists*/
void printList(list_t *list);
void insert_inList(list_t *list, void *new_key);
list_t* free_list(list_t *list);
void extract_fromList(list_t *list, void *x_key);
int search_inList(list_t *list, void *x_key);