DoublyLinkedElement

Short summary

Implementation of IDoublyLinkElement. Does not allow NULL as object.

Access	Abstract	Final	Extends	Implements
INTERNAL	No	No	AbstractDisposableContainer	CNM_CollectionInterfaces.IDoublyLinkedElement

UML Diagram

Parameters

none

Properties

className

Type: CNM_AbstractObject.ClassName

This abstract property returns the class name of the concrete object, …

next

Type: CNM_CollectionInterfaces.IDoublyLinkedElement

This property returns the next element that is linked to this element. Next element previous should be this object.…

object

Type: CNM_CollectionInterfaces.CNM_AbstractObject.IObject

This property returns CNM_AbstractObject.IObject that represents the data of this element.…

previous

Type: CNM_CollectionInterfaces.IDoublyLinkedElement

This property returns the previous element that is linked to this element. Previous element next should be this object.…

Methods

clearContents

• Return type: VOID

This method is called in the destruct method and is intended to zero all references and interfaces that should not be destructed. …

destructContents

• Return type: VOID

This method is called in the deepDestruct method and is intended to destruct all contained Objects of the collection. …

FB_Exit

• Parameters:
  • bInCopyCode (BOOL): TRUE: the exit method is called in order to leave the instance which will be copied afterwards (online change).
• Return type: BOOL

Mark the object as deleted, as it staiys in the memory.…

FB_init

• Parameters:
  • bInitRetains (BOOL): if TRUE, the retain variables are initialized (warm start / cold start)
  • bInCopyCode (BOOL): if TRUE, the instance afterwards gets moved into the copy code (online change)
  • content (CNM_AbstractObject.IObject)
  • next (CNM_CollectionInterfaces.IDoublyLinkedElement)
  • previous (CNM_CollectionInterfaces.IDoublyLinkedElement)
• Return type: BOOL

The constructor FB_init is needed to create an unique hash code.…

Code

Declaration

{attribute 'hide'}
{attribute 'enable_dynamic_creation'}
FUNCTION_BLOCK INTERNAL DoublyLinkedElement EXTENDS AbstractDisposableContainer IMPLEMENTS CNM_CollectionInterfaces.IDoublyLinkedElement
VAR
	nextElement 	:CNM_CollectionInterfaces.IDoublyLinkedElement;
	previousElement :CNM_CollectionInterfaces.IDoublyLinkedElement;
	dataObject 		:CNM_AbstractObject.IObject;
END_VAR