LCOM1920-T5G03

list_node_t* (list_begin)    (list_t *l){ return l->begin_->n; }

list_node_t* (list_end)      (list_t *l){ return l->end_; }

size_t       (list_size)     (const list_t *l){ return l->sz; }

list_node_t* (list_insert)   (list_t *l, list_node_t *position, void *val){

    list_node_t *node = list_node_ctor(position->p, position, val);

    position->p->n = node;