I come here humbly to ask for a new implementation, the IIF ?:, the IIF is a shortcut that make the coding a little faster, it works by returning a true or a false part of a condition, a more detailed information can be found there: http://en.wikipedia.org/wiki/%3F:

*PHP and C++ implementation:* Value *=* condition *?* value if true *:*
value if false;
*Pascal implementation:* Value := IfThen(Condition, TruePart, FalsePart);

*function IfThen(Condition: Boolean; IfTrue, IfFalse: X): X; overload; begin

     if Condition then Result := IfTrue else Result := IfFalse;

end;
*
The problem: we have to do *one function for every type*, on the C and PHP method is is *globally*
If we want one for Integer we must declare one for it, if we want one for X we need to declare it...

I want to know from you, what you would think about it on FPC? I don't belive that it is a hard feature to implement and is helpfull. I'll be waiting for your response!

*If this is not the right mailing list for proposals, then I apologize. *
Thank you,
Bizz

Similar to delphi generic method:
  function IIf<T>(Condition: Boolean; IfTrue, IfFalse: T): T;
  begin
    if Condition then
      Result := IfTrue
    else
      Result := IfFalse;
  end;

I'm working on this functionality for classes, objects and record methods.

But even delphi does not have it for regular procedures/functions. I suppose because regular procedures/functions does not support overloading.

Best regards,
Paul Ishenin

In our previous episode, Paul Ishenin said:

But even delphi does not have it for regular procedures/functions. I suppose because regular procedures/functions does not support overloading.

??? I use it all the time? Requires overload directive iirc, but works.

12.01.2011 13:47, Marco van de Voort пишет:

Indeed... I somehow have misled myself.

Well, then I don't know the reason why delphi does not have generic functions/procedures.

Best regards,
Paul Ishenin

Well guys, thanks for replying, the generic method is a very nice method, I personally didn't know that the FPC support it, very thank you for that!

12.01.2011 13:54, пишет:

Well guys, thanks for replying, the generic method is a very nice method, I personally didn't know that the FPC support it, very thank you for that!

FPC does not support it at the moment. I hope it will in a month.

Best regards,
Paul Ishenin

Ok, I'll be waiting for that!

Guys, you reply fast and nice!

Thank you again, anyways =)

Oh wow O.o

That's why I love Free Pascal...

Btw: Do you plan to implement constraints as well?

Regards,
Sven

Sven Barth wrote

Btw: Do you plan to implement constraints as well?

I thought to implement all what delphi has but I don't know whether I will be able to.

Best regards,
Paul Ishenin

The standard Pascal implementation of the C ternary expression is a
   const Name: array[boolean] of <type> = (FalseFart, TruePart);
and
   Value := Name[Condition];

DoDi

Note that there is a tiny little difference between those two.

the ?: operator evaluates either the TruePart or FalsePart while IfThen will evaluate both parts first.

The following will succeed

var
   p: PInteger;
   i: Integer;
begin
   p := nil;
   i := p  nil ? p^ : 0;
end;

The following will fail

var
   p: PInteger;
   i: Integer;
begin
   p := nil;
   i := IfThen(p  nil, p^ , 0);
end;

Exactly. This is why for me IfThen is much less useful then conditional operators in other languages.
I think a better alternative would be Algol-like if-expression: a := (if x > 0 then x else -x);