Deleting Nodes

deletefirst(exlist, exav)


The first node is deleted.  Its successor (if any) becomes the new first node and exav is altered to point to it.

If the list only has one node:


If the list had only one node it is empty afterwards and exav is invalid.

deletenext(exlist, exav)

LP-deletenextThe successor of the node pointed to by exav is deleted if present. exav remains unchanged.

If exav is already pointing to the last node:

LP-deletenext-lastNext: Create and Destroy