System.Variants.TCustomVariantType.IsClear
Delphi
function IsClear(const V: TVarData): Boolean; virtual;
C++
virtual bool __fastcall IsClear(const TVarData &V);
Properties
Type | Visibility | Source | Unit | Parent |
---|---|---|---|---|
function | public | System.Variants.pas System.Variants.hpp |
System.Variants | TCustomVariantType |
Description
Indicates whether the data from a custom Variant represents a blank or unassigned value.
Override IsClear to identify when data from a Variant of the custom Variant type represents a blank or unassigned value. The global VarIsClear method calls IsClear when given a custom Variant of this type.
As Implemented in TCustomVariantType, IsClear always returns false. Override this method to return true for invalid values or special values set by the Clear method.