On Sat, Jan 30, 2016 at 2:19 PM, silvioprog <silviop...@gmail.com> wrote:
> On Fri, Jan 29, 2016 at 8:28 AM, Marco van de Voort <mar...@stack.nl> > wrote: > >> In our previous episode, silvioprog said: >> > > The format of interface VMTs could also differ per platform so >> considering >> > > that as more stable only holds true because of what we currently >> support. >> > > >> > Sorry for ask here, but, don't you recomment to use interfaces? I'm >> making >> > a project and I'm planning to use some COM interfaces to make something >> a list >> > adapter >> > <http://developer.android.com/reference/android/widget/ListAdapter.html >> >. >> >> Interfaces are relatively slow. Not only because of the refcounting, but >> returning interfaces in a tight loop (e.g. to get the elements of an >> enumeration) would be a new allocation each time. > > > Hm... I didn't know that. > > I need to take a test using some profiling tool to check the real cost > using interfaces, because in my case I'm using lists. However, I still > can't understand why some programmers avoid to use interfaces in Pascal. > :-/ > Well, I did a simple test. Result: C: 00:00:11.008 I: 00:00:14.555 I: 00:00:14.511 C: 00:00:10.880 Press [ENTER] to exit ... Source: http://pastebin.com/x74V4gEx . It seems that the COM interfaces is a little bit slower than classes. Anyway, I don't have problem to use interfaces, however I'll use it only when it is really necessary. -- Silvio Clécio
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