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### Author Topic: Inc operator overloading problem with latest FPC  (Read 2207 times)

• Hero Member
• Posts: 14031
• Probably until I exterminate Putin.
##### Re: Inc operator overloading problem with latest FPC
« Reply #15 on: December 10, 2023, 06:49:31 pm »
No, that is correct, but apply that to tour first example. It will work out of the box.
Specialize a type, not a var.

#### jamie

• Hero Member
• Posts: 6041
##### Re: Inc operator overloading problem with latest FPC
« Reply #16 on: December 10, 2023, 08:32:12 pm »
then you have this.
Code: Pascal  [Select][+][-]
1. unit Unit1;
2.
3. {\$mode objfpc}{\$H+}
5.
6. interface
7.
8. uses
9.   Classes, SysUtils, Forms, Controls, Graphics, Dialogs, StdCtrls;
10.
11. type
12.   TTest = record
13.     I:Integer;
14.   end;
15.
16.   { TForm1 }
17.
18.   TForm1 = class(TForm)
19.     Button1: TButton;
20.     procedure Button1Click(Sender: TObject);
21.   private
22.
23.   public
24.
25.   end;
26. Procedure Inc(Var A:Ttest;B:Integer=1) overload  inline;
27. Procedure Inc(Var A:Integer;B:Integer=1) overload inline;
28. var
29.   Form1: TForm1;
30.
31. implementation
32.
33. {\$R *.lfm}
34.
35. { TForm1 }
36. Procedure Inc(Var A:Ttest;B:Integer=1);
37. Begin
38.   System.Inc(A.I, B);
39. End;
40. Procedure Inc(Var A:Integer;B:Integer=1);
41. Begin
42.   System.Inc(A, B);
43. end;
44.
45. procedure TForm1.Button1Click(Sender: TObject);
46. Var
47.   A:Ttest;
48.   B:Integer;
49. begin
50.   Inc(B);
51.   Inc(A);
52. end;
53.
54. end.
55.
56.
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• Full Member
• Posts: 179
##### Re: Inc operator overloading problem with latest FPC
« Reply #17 on: December 11, 2023, 10:06:42 am »
then you have this.
Code: Pascal  [Select][+][-]
1. Procedure Inc(Var A:Integer;B:Integer=1);
2. Begin
3.   System.Inc(A, B);
4. end;
5.
Yes, I had thought of that. But I would have re-implement every possible combination of parameter types to Inc, including strings, that the system Inc works with; not just a few integer types.
I think I've decided that the two parameter Inc will not be implemented in my library. They can easily just implement it themselves if they really need it.

#### jamie

• Hero Member
• Posts: 6041
##### Re: Inc operator overloading problem with latest FPC
« Reply #18 on: December 11, 2023, 02:53:46 pm »
There is the Coperators when on and normally defaulted as on.

+=. -= etc.

Not sure if you can do those.
The only true wisdom is knowing you know nothing