Lazarus

Programming => General => Topic started by: Dan3468298 on August 04, 2020, 03:27:57 pm

Title: Error: Operator is not overloaded?
Post by: Dan3468298 on August 04, 2020, 03:27:57 pm

Specific is error is

Code: Pascal  [Select][+][-]

1. unit1.pas(158,24) Error: Operator is not overloaded: "Set Of Char" or "Char"
2.  

Why can't I do an  'or' conditional?

Code: Pascal  [Select][+][-]

1. procedure TForm1.txtHeightKeyPress(Sender: TObject; var Key: char);
2. begin
3.  
4.   if Key in ['0'..'9'] or Key = '' then
5.     //allow user input
6.   else
7.     Key := #0;
8.  
9. end;

Title: Re: Error: Operator is not overloaded?
Post by: JdeHaan on August 04, 2020, 03:31:50 pm

You have to use parenthesis in this case:

  if (Key in ['0'..'9']) or (Key = '') then

Title: Re: Error: Operator is not overloaded?
Post by: Dan3468298 on August 04, 2020, 04:10:27 pm

I had tried that too but it must have been an early morning brain fart typo.  Thanks for the wake up!