Crazy Layered Memory

Crazy Layered Memory (a.k.a. clm) is a data structure that uses layers and cells to store data.

Layers

Each layer contains any number of layers and cells, as well as one index-cell and a active-cell.

The index-cell is stored at index -1 of its layer and contains the index that is currently accessed at this layer.
The active-cell is stored at index -2 of its layer and stores, whether this layer is the active layer (if not, functions affect the layer below this one)

Cells

are located inside of layers and contain the actual data

Functions

Function	Description
insertLayer	inserts a new layer after the current element
insertCell	inserts a new cell after the current element
delete	deletes the element referenced by the index-cell
next	changes the index-cell by 1 (if index is greater than or equal to the length of the layer it loops around to -1)
previous	changes the index-cell by -1 (if index is less than -1 it loops around to the last elemnt of the layer)
down	if the current element is a layer, enter that layer
up	exits current layer if possible
length	returns the length of the current layer (excluding index- and marker-cell)

Usage in esolangs

Currently, clm is only used by one esolang, clml, it is previously categorized in Category:Clm-based, but that category was deleted because it only contains one esolang.