Conceptual error in the script engine

vlad-mal · February 2019

Due to the incorrect implementation of caching of parameters in functions exported in FastScript, the further use of these functions is potentially dangerous because obtaining unpredictable results.

For example, we declare two functions in the script.
First function:

function Test1(aValue : boolean = false) : string;
begin
Â Â result := iif(aValue, 'True', 'False');Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  
end;

The second function is the twin of the first:

function Test2(aValue : boolean = false) : string;
begin
Â Â result := iif(aValue, 'True', 'False');Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â  
end;

Then call them:

Â Â ShowMessage(Test1(True) + ' ' + Test2(False));

We get the result: 'True True' instead of the expected 'True False'.

Peta · February 2019

Both your functions are Test1. Below is a complete script.
And I think it's better to open a ticket than to write in this forum.

function Test1(aValue : boolean) : string;
begin
Â Â result := iif(aValue, 'True', 'False');Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 
end;

function Test2(aValue : boolean) : string;
begin
Â Â result := iif(aValue, 'True', 'False');Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 
end;Â Â Â Â 

begin
Â Â ShowMessage(Test1(True) + ' ' + Test2(False));Â Â 
end.

vlad-mal · February 2019

Peta wrote: »

Both your functions are Test1.
...

Thanks for the remark, I corrected the code in the original message.

Conceptual error in the script engine

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