Linked lists are suitable as a flexible and modular way to implement simple and powerful code with ease. This library will allow you to leverage the simplicity, power and flexibility of linked lists.
A linked list is a data structure that represents a sequence of nodes (Elements). This library implements a so called "double linked list", which simply means that the list gives each Element pointers to both the next Element and the previous Element. Unlike an array, a linked list does not provide constant time access to a particular “index” within the list. This means that if you’d like to find the K-th element in the list, you will need to iterate through K elements. The benefit of a linked list is that you can add and remove Elements from the list during runtime.
Insert the Library Reference in your program.
Declare a new FB called FB_ExtendedElement
// we need to extend at least one FB_Element since it has been decorated as ABSTRACT.// Any new FB that will be a part of the List should preferably use encapsulation and composition to implement// FB_ExtendedElement. So FB_ExtendElement will act as a baseclass for your Element.// If you use encapsulationn and composition it will provide you with (way) more flexibility but also more programming since you have to encapsulate/composite all methods and properties tooFUNCTION_BLOCKFB_ExtendedlementEXTENDSLinkedList.FB_ElementVAR_uiCount:UINT:=0;END_VAR// BodySuper^();METHODReturnInstance:POINTERTOTHIS// BodyReturnInstance:=THIS;METHODCount:UINT;// Body_uiCount:=uiCount+1;
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