[Interest] How to speed-up chameleons

[Romain Beaumont]

"first chameleon should wait a second;" this sound like semaphore to me,
but I don't know this chameleon problem.
What part of Qt is causing it to be slow ? QThread ? the signal/slot ?


2014-06-11 18:51 GMT+02:00 <igor.mironchik at gmail.com>:

>   Hi.
>
> What do you suggest?
>
>  *From:* Romain Beaumont <romain.rom1 at gmail.com>
> *Sent:* Wednesday, June 11, 2014 5:12 PM
> *To:* Keith Gardner <kreios4004 at gmail.com>
> *Cc:* igor.mironchik at gmail.com ; interest at qt-project.org
> *Subject:* Re: [Interest] How to speed-up chameleons
>
>  Hi,
> Why do you need to use Qt signals/slots ?
> Isn't there something more appropriate to this task ?
>
>
> 2014-06-11 15:36 GMT+02:00 Keith Gardner <kreios4004 at gmail.com>:
>
>>     I have one question to you. Why new syntax of QObject::connect()
>>> improve performance for a 5%.
>>>
>>> I mean that if in code change
>>>
>>> connect( sender, SIGNAL( signal() ), receiver, SLOT( slot() ) );
>>>
>>> to
>>>
>>> connect( sender, &Sender::signal, receiver, &Receiver::slot );
>>>
>>> then code works faster... Why? May be somebody know the answer, I don’t
>>> want to read Qt’s code for the answer on this question.
>>>
>>
>> I would guess would be that the first connect is performing a string
>> lookup and validating the arguments at run time.  SIGNAL and SLOT are
>> taking the macro parameters and turning them into character arrays.
>>
>> The second connect is working with function pointers which allows for the
>> compiler validate their existence and ensure that the arguments are
>> compatible at compile time instead of run time.
>>
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