UndefinedJob class

Class definition for an undefined job. Replaces null to avoid the miserable null warnings when using LogicalNodes and JobLists which it is ensured that at the time of use they are not are not equal to zero, but are not yet instantiated in the constructor in a meaningful way. could be realised. For any subsequent null queries, null must be replaced by the static instance 'UndefinedJob' (see below).

public class UndefinedJob : Job,
	 
	IUndefinedElement

Public Class UndefinedJob
	Inherits Job
	Implements IUndefinedElement

public ref class UndefinedJob : public Job,
	 
	IUndefinedElement

type UndefinedJob = 
    class
        inherit Job
        interface IUndefinedElement
    end