[fpc-pascal] Re: TLinkedList

Sven Barth pascaldragon at googlemail.com
Wed Feb 15 14:32:24 CET 2012


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?

Regards,
Sven




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