[fpc-pascal] Re: Generics - how to rewrite TOjectDictionary
skalogryz.lists at gmail.com
Mon Apr 8 12:06:30 CEST 2013
please disregard my last note about "avoiding the sanity check"
On Mon, Apr 8, 2013 at 1:52 PM, dmitry boyarintsev <
skalogryz.lists at gmail.com> wrote:
> You can always use functions, to fight typecasting.
> function GetMyObject(dic: TStrings; const nm: string): TMyObject;
> i : integer;
> if not Assigned(dic) then begin Result:=nil; Exit; end;
> i:=dic.indexof(nm); // replace with IndexOfName if necessary
> if (i<0) or (i>=dic.Count) or not (i.Objects[i] is TMyObject) then
> else Result:=TMyObject(i.Objects[i]); // not using "as" , since "is" has
> already been used
> Of course, people would use ClassHelpers these days to have nice syntax
> and avoid the sanity check.
> On Mon, Apr 8, 2013 at 1:42 AM, Marius2 <fpclazarus at home.nl> wrote:
>> Thanks Dimitri,
>> Yes, I have used it lots of times and its really the last choice if theres
>> something available like the objectdictionary. In this case the dict is
>> the owner of the objects, it saves me the continious ugly typecasting,
>> care of the extra administration with freeing objects and all the
>> troubles you get over time with this solution (its not as bad as i'm
>> now). In other words tstrings.objects are working fine, but i find it a
>> strategy if you have to use it in flatout in the whole application.
>> I'm curious how to rewrite/solve dictionaries, indexed list and even
>> strings.objects to a neat solution while (if possible) working with both
>> delphi and fpc/laz.
>> View this message in context:
>> Sent from the Free Pascal - General mailing list archive at Nabble.com.
>> fpc-pascal maillist - fpc-pascal at lists.freepascal.org
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