Instance

Gets the Singleton instance of the class.

InstanceVar := MfEnum.Instance

Remarks

MfEnum derived class such as MfDigitShapes are base on a singleton pattern.

MfEnum is an abstract class and Instance can only be called on derived classes.
Derived classes must override the GetInstance method.

Example

; create a new enumeration class by inheriting/extending the MfEnum
class RegOptEnum extends MfEnum
{
   static m_Instance := MfNull.Null
   __New(args*)
   {
       if (this.base.__Class != "RegOptEnum")
       {
           throw new MfNotSupportedException(MfEnvironment.Instance.GetResourceString("NotSupportedException_Sealed_Class"
               ,"RegOptEnum"))
       }
       base.__New(args*)
       ; set MfObject m_isInherited flag for testing if Class is inherited/extended if needed
       ; This could be set to false as this class cannot be inherited/extended as set in this constructor above
       ; but will do it the standard way.
       this.m_isInherited := this.__Class != "RegOptEnum"
   }
       
   ; override the base AddEnums, this is required
   ; add all the enum values for your enum here
   AddEnums() {
       this.AddEnumValue("RegDword", 0)
       this.AddEnumValue("KeysRegDword", 1)
       this.AddEnumValue("RegSz", 2)
       this.AddEnumValue("KeysRegSz", 3)
       this.AddEnumValue("RegBinary", 4)
       this.AddEnumValue("KeysRegBinary", 5)
       this.AddEnumValue("AutoresponseRegSz", 6)
       this.AddEnumValue("KeysAutoresponseRegSz", 7)
       this.AddEnumValue("AutoupdateRegSz", 8)
       this.AddEnumValue("KeysAutoupdateRegSz", 9)
       this.AddEnumValue("AutoupdateRegBinary", 10)
       this.AddEnumValue("KeysAutoupdateRegBinary", 11)
       this.AddEnumValue("KeypathsRegSz", 12)
       this.AddEnumValue("KeysKeypathsRegSz", 13)
       this.AddEnumValue("KeypathsRegDword", 14)
       this.AddEnumValue("KeysKeypathsRegDword", 15)
       this.AddEnumValue("WindowplacementRegBinary", 16)
       this.AddEnumValue("KeysWindowplacementRegBinary", 17)
   }

   ; override the base DestroyInstance, this is required
   DestroyInstance() {
       RegOptEnum.m_Instance := Null        
   }

   ; override the base GetInstance, this is required
   ; Get a static default instance, create if not exist yet
   GetInstance() {
       if (MfNull.IsNull(RegOptEnum.m_Instance))
       {
           RegOptEnum.m_Instance := new RegOptEnum(0)
       }
       return RegOptEnum.m_Instance
   }
}