System.Variants.TCustomVariantType.CompareOp
Delphi
function CompareOp(const Left, Right: TVarData;
const Operator: TVarOp): Boolean; virtual;
C++
virtual bool __fastcall CompareOp(const TVarData &Left, const TVarData &Right, const System::TVarOp Operator);
Properties
| Type | Visibility | Source | Unit | Parent |
|---|---|---|---|---|
| function | public | System.Variants.pas System.Variants.hpp |
System.Variants | TCustomVariantType |
Description
Implements any comparison operations of which the custom Variant type is capable.
Override CompareOp to implement any comparison operators the custom Variant type supports. Descendants can implement comparison operators by overriding either the Compare or the CompareOp method.
Left is the value that appears to the left of the operator.
Right is the value that appears to the right of the operator.
Operator identifies the operator that appears between Left and Right. It can be any of the following values:
| Value | Operation |
|---|---|
|
opCmpEQ |
equality comparison |
|
opCmpNE |
inequality comparison |
|
opCmpLT |
less than |
|
opCmpLE |
less than or equal |
|
opCmpGT |
greater than |
|
opCmpGE |
greater than or equal |
CompareOp returns True if the comparison is true as specified. It returns False if the specified comparison does not hold true.
As implemented in TCustomVariantType, CompareOp raises a system error indicating an invalid operation.