MATLAB Object-Oriented Programming

Example Code Discussion

function insertBefore(newNode, nodeAfter)

removeNode(newNode);

newNode.Next = nodeAfter;

newNode.Prev = nodeAfter.Prev;

if ~isempty(nodeAfter.Prev)

nodeAfter.Prev.Next = newNode;

end

nodeAfter.Prev = newNode;

end

Insert node into doubly linked list before

specified node, or link the two specified

nodes if there is not already a list. This

method assigns correct values for Next

and Prev properties.

See “Insert Nodes” on page 3-39

function removeNode(node)

if ~isscalar(node)

error('Nodes must be scalar')

end

prevNode = node.Prev;

nextNode = node.Next;

if ~isempty(prevNode)

prevNode.Next = nextNode;

end

if ~isempty(nextNode)

nextNode.Prev = prevNode;

end

node.Next = = dlnode.empty;

node.Prev = = dlnode.empty;

end

Remove node and fix the list so that

remaining nodes are properly connected.

node argument must be scalar.

Once there are no references to node,

MATLAB deletes it.

“Remove a Node” on page 3-41

function clearList(node)

prev = node.Prev;

next = node.Next;

removeNode(node)

while ~isempty(next)

node = next;

next = node.Next;

removeNode(node);

end

while ~isempty(prev)

node = prev;

prev = node.Prev;

removeNode(node)

end

end

Avoid recursive calls to destructor as a

result of clearing the list variable. Loop

through list to disconnect each node.

When there are no references to a node,

MATLAB calls the class destructor (see

the delete method) before deleting it.

methods (Access = private)

function delete(node)

clearList(node)

end

Class destructor method. MATLAB calls

the delete method you delete a node

that is still connected to the list.

end

end

End of private methods and end of class

definition.

3 MATLAB Classes Overview