Declaration¶
Source position: fpexprpars.pp line 316
type
TFPSubtractOperation = class(TMathOperation)
public
procedure Check;
procedure GetNodeValue;
function AsString : AnsiString;
end;
Description¶
The TFPSubtractOperation class implements the subtraction operation between two numeric operands. It extends the binary operation framework to provide subtraction-specific functionality for integers, floats, and currency values.
The operation handles type conversion automatically when operands have different numeric types, promoting the result to the more precise type as needed. The result type follows standard numeric promotion rules.
The subtraction operation computes the difference between the left operand (minuend) and the right operand (subtrahend), returning left - right.
This class is used internally by the TFPExpressionParser class to construct an AST (Abstract Syntax Tree). There is normally no need for you to use or instantiate this class directly.
Methods¶
| Member | Visibility | Description |
|---|---|---|
| AsString | public | Get string representation of subtraction operation |
| Check | public | Validate the subtraction operation for correctness |
| GetNodeValue | public | Calculate the result of subtraction operation |
See also¶
| Name | Description |
|---|---|
| TFPExprNode | Class for representing nodes in expression trees |