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# linked_list.h

On top of implementing the list interface, this header also defines several low-level functions that
work with arbitrary structures.
Low-level functions, in contrast to the high-level list interface, can easily be recognized by their snake-casing.
The function `cx_linked_list_at`, for example, implements a similar functionality like `cxListAt`, but operates
on arbitrary structures.
The following snippet shows how it is used.
All other low-level functions work similarly.
```c
struct node {
    node *next;
    node *prev;
    int data;
};

const ptrdiff_t loc_prev = offsetof(struct node, prev);
const ptrdiff_t loc_next = offsetof(struct node, next);
const ptrdiff_t loc_data = offsetof(struct node, data);

struct node a = {0}, b = {0}, c = {0}, d = {0};
cx_linked_list_link(&a, &b, loc_prev, loc_next);
cx_linked_list_link(&b, &c, loc_prev, loc_next);
cx_linked_list_link(&c, &d, loc_prev, loc_next);

cx_linked_list_at(&a, 0, loc_next, 2); // returns pointer to c
```