TCustomVariantType.CompareOp Method

Implements any comparison operations of which the custom System::Variant type is capable.

Pascal

function CompareOp(const Left: TVarData; const Right: TVarData; const Operator: TVarOp): Boolean; virtual;

C++

virtual __fastcall Boolean CompareOp(const TVarData Left, const TVarData Right, const TVarOp Operator);

Description

Override CompareOp to implement any comparison operators the custom System::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.