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Navigation: Code Documentation > RSCommon > GLists > Classes

TGLinkedList Class

Defines a linked list class where every node in the list has an associated Item object.

Namespace: GLists

	Name	Description
	Count	Returns the number of nodes in the linked list. (Inherited from GLists.TGCustomLinkedList.)
	Empty	Returns true if the linked list is empty. (Inherited from GLists.TGCustomLinkedList.)
	EndOfList	Returns true when the last accessed node has been returned. (Inherited from GLists.TGCustomLinkedList.)
	Head	Represents property Head.
	Item	Represents property Item.
	LastAccessedIndex	Caches the index of the last node accessed. This helps speeds up subsequent calls to Item or Node properties. (Inherited from GLists.TGCustomLinkedList.)
	LastAccessedNode	Caches the last node accessed. This helps speeds up subsequent calls to Item or Node properties. (Inherited from GLists.TGCustomLinkedList.)
	Next	Moves the internal Node to the next node in the linked list (Inherited from GLists.TGCustomLinkedList.)
	Node	Represents property Node.
	OnChange	Represents property OnChange.
	Tail	Represents property Tail.
	UpdateCount	Represents property UpdateCount. (Inherited from GLists.TGCustomLinkedList.)

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Name

Description

public method

Add(TObject)

Creates a new node in the linked list and sets its Item property to the input object.

Add returns the node created.

public method

AddLinkedList(TGCustomLinkedList)

Appends the input linked list to the end of the current linked list. (Inherited from GLists.TGCustomLinkedList.)

public method

AddNode(TSQNode)

Adds the input node to the end of the linked list. (Inherited from GLists.TGCustomLinkedList.)

public method

Assign(TPersistent)

Represents method Assign(TPersistent). (Inherited from GLists.TGCustomLinkedList.)

public method

BeginUpdate

Defers OnChange events until EndUpdate is called.

BeginUpdate and EndUpdate work in tandem to defer change events to speed processing. Use BeginUpdate to defer change events until an equal number of EndUpdate calls occurs.

protected method

Change

Represents method Change. (Inherited from GLists.TGCustomLinkedList.)

public method

Clear

Empties the linked list

Note
Items associated with nodes are not freed.

public method

Delete(TSQNode)

Deletes the specified node from the linked list. (Inherited from GLists.TGCustomLinkedList.)

public method

EndUpdate

Reenables OnChange events after BeginUpdate has been called.

BeginUpdate and EndUpdate work in tandem to defer change events to speed processing. Use BeginUpdate to defer change events until an equal number of EndUpdate calls occurs.

public method

Find(TSQNode)

Find returns the Node before ANode i.e., whose Next field points to
ANode. If Find returns the Node itself then Node is the Head node (Inherited from GLists.TGCustomLinkedList.)

public method

FindItem(TObject)

FindItem returns the node whose Item property equals the input object.

If the item cannot be found, the method returns nil.

public method

GetEnumerator

Returns an enumerator for iterating over the linked list. (Inherited from GLists.TGCustomLinkedList.)

protected method

GetNode(Integer)

Represents method GetNode(Integer). (Inherited from GLists.TGCustomLinkedList.)

public method

IndexOfItem(TObject)

Returns the position of the node (0 = head) whose Item property equals the input object.

If the item cannot be found, the method returns -1.

public method

Insert(TSQNode,TSQNode)

Inserts the input ANode into the linked list. The node is inserted before the BeforeNode (i.e., ANode.Next := BeforeNode). (Inherited from GLists.TGCustomLinkedList.)

public method

NewNode

Creates a new node. The new node is not added to the linked list. (Inherited from GLists.TGCustomLinkedList.)

public method

Reset

Resets the iteration node to the head of the list. (Inherited from GLists.TGCustomLinkedList.)

protected method

SetNode(Integer,TSQNode)

Represents method SetNode(Integer,TSQNode). (Inherited from GLists.TGCustomLinkedList.)

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The list also provides accessor properties to do this for you. The following example also iterates through the list:

Delphi

List.Reset; // go to head of list
while not List.EndOfList do
begin
List.Item := MyObject;
List.Next;
end;

The TGCustomLinkedList also supports the for-in construct of Delphi:

Note
for aNode in List do aNode.Item := MyObject

note Note

for aNode in List do

aNode.Item := MyObject

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