[Development] Outfit based collation (was: RFC: Proposal for a semi-radical change in Qt APIs taking strings)

Knoll Lars Lars.Knoll at theqtcompany.com
Fri Oct 16 12:58:47 CEST 2015


Wow... I have no idea how my mail client autocorrected utf8 to Outfit. :)

Cheers,
Lars

On 16/10/15 12:53, "Knoll Lars" <Lars.Knoll at theqtcompany.com> wrote:

>Hi Marco,
>
>On 16/10/15 11:46, "Bubke Marco" <Marco.Bubke at theqtcompany.com> wrote:
>>
>>>> That is the
>>>> power of iterators and with the new features of C++ they get really
>>>>useful.
>>>> But anyway,  I don't say that we have to change everything. The last
>>>>time
>>>> we did that we broke our event system which is still not working like
>>>>it
>>>> was before we introduced QWindow. I think we  should have an
>>>>evolutionary
>>>> process to  adapt to the  changing environment and not try to
>>>>reiterate
>>>> what was successful in the past.
>>>
>>> I agree with what you said in this paragraph. But it does not lead to a
>>> conclusion about using UTF-8 or even providing our own UTF-8 class.
>>>
>>
>>Introducing an utf 8 class is not that hard but providing the framework
>>around. Collations are the problem. We have to use utf8 in QtCreator
>>anyway so we could find out what is an useful API.  But colation support
>>in Qt would be really helpful in the longer run.
>
>The problem with Collation and utf-8 is that the only API offering utf-8
>based collation is ICU (which offers both utf-8 and utf-16 based
>collation). Mac and Windows only offer utf-16.
>
>So we’d still need to convert in most cases. It would probably be possible
>to do that on the stack for small strings to avoid a malloc though. So we
>can discuss adding a QCollator::collateUtf8(const char *s1, int len1,
>const char *s2, int len2).
>
>But just out of curiosity, where does Creator need collation in a
>performance critical place?
>
>Cheers,
>Lars
>
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