TFPFunctionCallBack¶

Internally used class for callback-based function expressions

Declaration¶

Source position: fpexprpars.pp line 704

type

  TFPFunctionCallBack = class(TFPExprFunction)
  public
    constructor CreateFunction;
    procedure GetNodeValue;
    property CallBack: TFPExprFunctionCallBack; {r}
  end;

Inheritance¶

Description¶

The TFPFunctionCallBack class implements function calls that are resolved using callback mechanisms rather than built-in function implementations. It extends the expression framework to allow dynamic function resolution through user-defined callback procedures.

The callback function mechanism enables applications to provide custom function implementations that can be called from within expressions. This allows for extending the expression language with application-specific functions without modifying the core expression parser.

When a callback function is called, the registered callback procedure is invoked with the function arguments and is expected to compute and return the function result.

Properties¶

Member	Visibility	Description
CallBack read only	public	The callback procedure for function evaluation

See all Properties

Methods¶

Member	Visibility	Description
CreateFunction	public	Create callback function with identifier and arguments
GetNodeValue	public	Get callback function result

See all Methods