| Class member | Description | 
|---|---|
| Arg | Returns the value of an argument passed to a uCalc.Callback function | 
| ArgAddr | Returns the address of the argument value that is being passed | 
| ArgCount | Returns the number of arguments being passed to a uCalc.Callback function | 
| ArgExpr | Returns the object instance of the expression that's passed as an argument to a uCalc.Callback function+++Example | 
| ArgInt32 | Returns the Int32 integer argument passed to a uCalc.Callback function | 
| ArgInt64 | Returns the Int64 integer argument being passed to a uCalc.Callback function | 
| ArgObj | Returns an object instance of the argument being passed to a uCalc.Callback function | 
| ArgPtr | Returns a Pointer value being passed as an argument to a uCalc.Callback function | 
| ArgStr | Returns the value being passed as argument in to a uCalc.Callback function in form of a string | 
| ErrorRaise | Raises an error in a uCalc.Callback function | 
| ErrorRaiseMessage | Raises an error with a user-defined message in a uCalc.Callback function | 
| ExprPartHandle | Handle of the expression part the current callback instance is refering to | 
| GetuCalc | Returns the uCalc instance the current expression part belongs to | 
| Handle | Returns the handle of the sub expression passed to the callback | 
| OpItem | Returns the function or operator Item of the current expression part | 
| Return | Sets the return value (default floating point) of a uCalc.Callback function | 
| ReturnInt32 | Sets the return value of a uCalc.Callback function as an Int32 integer | 
| ReturnInt64 | Sets the return value of a uCalc.Callback function as an Int64 integer | 
| ReturnPtr | Sets the return value of a uCalc.Callback function as a Pointer | 
| ReturnStr | Sets the return value of a uCalc.Callback function as a String |