Is nil pointer

Is nil pointer ( aPointer ) : Boolean

Parameter	Type		Description
aPointer	Pointer	→	Pointer to be tested
Function result	Boolean	←	TRUE = Nil pointer (->[]) FALSE = Valid pointer to an existing object

Description

The Is nil pointer command returns True if the pointer you pass in aPointer is Nil (->[]). It returns False in all other cases (pointer to field, table or variable).

If you want to find out the name of the variable or the number of the field that is being pointed to, you can use the RESOLVE POINTER command.

Example

 var $ptr : Pointer
 ...
 If(Is nil pointer($ptr))
 End if
  // is equivalent to
 If($ptr=Null)
 End if

See also

Is a variable
RESOLVE POINTER

Properties

Command number	315
Thread safe	✓