FB_init

Short summary

The constructor FB_init is needed to create an unique hash code. The hash code is a pseudo random number create with a xorshift algorithm. It can be overwritten on derivations, because it will be called implicit, SUPER^.FB_init() is not required. For more information check: Behavoir with derived function blocks.

• Return type: BOOL

Parameters

Name	Type	Comment	Kind
bInitRetains	BOOL	if TRUE, the retain variables are initialized (warm start / cold start)	input
bInCopyCode	BOOL	if TRUE, the instance afterwards gets moved into the copy code (online change)	input
content	CNM_AbstractObject.IObject	-	input
next	CNM_CollectionInterfaces.IDoublyLinkedElement	-	input
previous	CNM_CollectionInterfaces.IDoublyLinkedElement	-	input

Code

Declaration

METHOD FB_init : BOOL
VAR_INPUT
	(* if TRUE, the retain variables are initialized (warm start / cold start)*)
	bInitRetains	:BOOL;
	(* if TRUE, the instance afterwards gets moved into the copy code (online change) *)
	bInCopyCode		:BOOL;  
	content 			:CNM_AbstractObject.IObject;
	next 	:CNM_CollectionInterfaces.IDoublyLinkedElement;
	previous :CNM_CollectionInterfaces.IDoublyLinkedElement;
END_VAR
VAR
	{attribute 'hide'}
	newHashstate3		:CNM_AbstractObject.Hashcode;
END_VAR
VAR CONSTANT
	{attribute 'hide'}
	NUMBER_OF_LEFT_SHIFTS		:UINT	:= 17;
	{attribute 'hide'}
	NUMBER_OF_LEFT_ROTATIONS	:UINT   := 45;
END_VAR

Implementation

THIS^.object := content;
THIS^.next := next;
THIS^.previous := previous;