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Is the custom value unassigned ?
Source position: variants.pp line 199
public function TCustomVariantType.IsClear( |
const V: tvardata |
):Boolean; virtual; |
V |
|
Custom variant to test |
True if the custom variant V is unassigned
IsClear must be overridden to decide whether the custom variant V is equivalent to varClear (unassigned) value. The VarIsClear function calls this method to decide whether a custom variant is unassigned.
The TCustomVariantType implementation of IsClear always returns False.
|
Check if a variant is clear |