Declaration¶
Source position: fpexprpars.pp line 685
type
TAggregateAvg = class(TAggregateSum)
public
procedure InitAggregate;
procedure UpdateAggregate;
procedure GetNodeValue;
end;
Inheritance¶
Description¶
The TAggregateAvg class implements the average (mean) aggregate function, which calculates the arithmetic mean of all processed numeric values. It extends TAggregateSum to leverage summation functionality while adding count tracking for average calculation.
The average function handles different numeric types and ensures appropriate precision in the final result. Division by zero is handled appropriately when no values have been processed.
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 |
|---|---|---|
| GetNodeValue | public | Calculate the average from aggregated values |
| InitAggregate | public | Initialize average aggregation |
| UpdateAggregate | public | Update average aggregate with new value |
See also¶
| Name | Description |
|---|---|
| TFPExprNode | Class for representing nodes in expression trees |