[Lazarus] Thanks to FPC team: Record helper for primitive types!

[silvioprog]

On Sat, Nov 29, 2014 at 5:55 PM, silvioprog <silvioprog at gmail.com> wrote:

> On Sat, Nov 29, 2014 at 4:54 PM, Michael Van Canneyt <
> michael at freepascal.org> wrote:
>>
>> On Sat, 29 Nov 2014, silvioprog wrote:
>>
>>> On Sat, Nov 29, 2014 at 2:04 PM, Sven Barth <pascaldragon at googlemail.com>
>>> wrote:
>>>       On 29.11.2014 16:54, silvioprog wrote:
>>>             Hello,
>>>
>>>             Today I compiled my FPC from trunk and saw the following
>>> possibility:
>>>
>>>
>>>       This feature is available since February 2013 already, you just
>>> had to use {$modeswitch typehelpers}
>>>       (I even announced that on fpc-devel, fpc-pascal and fpc-announce
>>> back then). What I committed
>>>       yesterday was simply to allow them by default in mode Delphi as
>>> that mode is simply a collection of
>>>       features supported by the current Delphi version (in so far they
>>> are already implemented in FPC). You
>>>       still have to use the modeswitch in other modes and in all modes
>>> except the Delphi ones it's "type
>>>       helper" instead of "record helper".
>>>
>>>       Regards,
>>>       Sven
>>>
>>>
>>> Awesome. I'll use type helper. =)
>>>
>>> Plans to implement the currently XE helpers? (TIntegerHelper,
>>> TStringHelper etc.)
>>>
>>
>> Definitely, as soon as I find time.
>> But initial patches welcome.
>>
>> Michael.
>
>
> Nice. To implement it we can need to enable the {$modeswitch
> typehelpers}. Can you enable it in SysUtils?
>

Just testing:

unit sysutils;
interface

{$MODE objfpc}
{$MODESWITCH OUT}
{$MODESWITCH TYPEHELPERS}
...

sysutilh.inc
...
  function GetModuleName(Module: HMODULE): string;

type
  TGuidHelper = type helper for TGuid
//    class function Create(const B: TBytes): TGUID; overload; static;
//    class function Create(const S: string): TGUID; overload; static;
//    class function Create(A: Integer; B: SmallInt; C: SmallInt; const D:
TBytes): TGUID; overload; static;
//    class function Create(A: Integer; B: SmallInt; C: SmallInt; D, E, F,
G, H, I, J, K: Byte): TGUID; overload; static;
//    class function Create(A: Cardinal; B: Word; C: Word; D, E, F, G, H,
I, J, K: Byte): TGUID; overload; static;
//    class function NewGuid: TGUID; static;
//    function ToByteArray: TBytes;
//    function ToString: string;
  end;
...

sysutilh.inc(330,3) Error: Type "TGuid" cannot be extended by a type helper

I'll leave this task to you. =D

-- 
Silvio Clécio
My public projects - github.com/silvioprog
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