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    TFPFunctionCallBack.GetNodeValue

    Get callback function result

    Declaration

    Source position: fpexprpars.pp line 709

    public 
procedure TFPFunctionCallBack.GetNodeValue
                                          (var Result: TFPExpressionResult)
                                          ;  override;

    Description

    The GetNodeValue method evaluates the callback function by calling the registered callback procedure with the function parameters and returns the computed result. It bridges the expression tree evaluation with external function implementations.