[fpc-pascal] Re: TLinkedList

[Sven Barth]

Am 15.02.2012 15:09, schrieb michael.vancanneyt at wisa.be:
>
>
> On Wed, 15 Feb 2012, Sven Barth wrote:
>
>> Am 15.02.2012 14:09, schrieb michael.vancanneyt at wisa.be:
>>>
>>>
>>> On Wed, 15 Feb 2012, Sven Barth wrote:
>>>
>>>> Am 14.02.2012 22:28, schrieb Marco van de Voort:
>>>>> In our previous episode, Sven Barth said:
>>>>>>> Afaik it was the main reason to implement generic constraints in
>>>>>>> Delphi (like
>>>>>>> .NET)?
>>>>>>
>>>>>> Constraints allow the compiler to infer further information on the
>>>>>> given
>>>>>> types to improve e.g. type checking when parsing the generic,
>>>>>
>>>>> Exactly. You e.g. know that the unspecialized generic is already
>>>>> meant for
>>>>> reference types, from line one.
>>>>>
>>>>>> but they won't magically allow the compiler to not duplicate code (in
>>>>>> theory it would be possible to do something like Java's generics for
>>>>>> cases
>>>>>> where the constraints are for descendants of TObject or IInterface,
>>>>>> but in
>>>>>> my opinion the tradeoffs (increased compiler complexity) are not
>>>>>> worth
>>>>>> it).
>>>>>
>>>>> Yeah, that is typical. If it is not used inside the compiler it is
>>>>> unoptimized :-)
>>>>>
>>>>> Maybe redo cclasses with generics?
>>>>
>>>> That wouldn't change that much... the performance of specialized
>>>> generics isn't that different from "normal" code.
>>>
>>> I tested that. It's about 10% slower.
>>
>> Compile time or runtime?
>
> Runtime.

Then this might be because the current generic classes are written in a 
rather generic way (no pun intended). This might improve once 
constraints are implemented and generics for specific subtypes (e.g. the 
TFPGObjectList) can be implemented more efficiently.

Regards,
Sven