[Development] QList

Konstantin Tokarev annulen at yandex.ru
Fri Mar 31 09:43:18 CEST 2017

31.03.2017, 10:38, "Marc Mutz" <marc.mutz at kdab.com>:
> On Friday 31 March 2017 08:57:50 Simon Hausmann wrote:
>>  Hi,
>>  To me this appears to be comparing the questions that new learning
>>  programmers have with questions of seasoned C++ programmers. I understand
>>  that we should cater both with Qt, but the topic at this point of the
>>  thread is the former group, not the latter.
> Which questions do you think are beginner's and which ones are seasoned
> developer's questions?
> What criteria do you use to put one in one bin and the other in the other?
> People that use C++ without Qt have excellent online documentation, too[1].
> And if they peruse it to find out how to fill a vector from a C array, then
> they will come across assign() and the range constructors. They start with Qt,
> and they miss these things.
> Everyone learning C++ with the 2011 edition of the standard will be used to
> just throwing ranged-for at every container and suddenly a fat man in a
> YouTube video tells them that doing so with Qt containers performs a deep
> copy. Sure they have questions.
> So, no, Qt containers are not more novice-friendly than STL containers, nor
> vice versa. They all leave something to be desired. Picking one part of the
> API and saying "this is why it's better/worse" will predicably be responded to
> by showing the other half of the picture.
> But one thing the STL has going for it: once you do learn it, it lets you go
> farther with what you have learned than Qt. Once you learned the find()
> algorithm, you can apply it to every C++ container in the world, incl. C
> arrays and Qt containers. Incl. QFuture, which is a Qt container that -
> surprise - doesn't have indexOf() and contains().
> Thanks,
> Marc
> [1] even better than Qt's, these days, since cppreference.com clearly shows
> what's available in which C++ version while Qt hides all but the latest
> documentation, which only describes the current state of affairs.

Each Qt release is shipped with documentation.
Also, there is \since.

>>  Simon
>>  > On 31. Mar 2017, at 08:41, Marc Mutz <marc.mutz at kdab.com> wrote:
>>  >> On Thursday 30 March 2017 22:32:35 Alejandro Exojo wrote:
>>  >>> On Wednesday 29 March 2017 20:11:58 Marc Mutz wrote:
>>  >>> I would really, really
>>  >>> like to know why QVector is easier to use? Because it has indexOf()?
>>  >>> Seriously, now?
>>  >>
>>  >> Because it has _lots_ of easy to use member functions, and another kind
>>  >> of iterator that is also easier to use for some, and good
>>  >> documentation. I'm not making this stuff up:
>>  >>
>>  >> http://stackoverflow.com/questions/571394/
>>  >
>>  > Oh, I can play this game, too:
>>  >
>>  > http://stackoverflow.com/questions/16559655/
>>  > http://stackoverflow.com/questions/38262041/
>>  > http://stackoverflow.com/questions/10153658/
>>  > http://stackoverflow.com/questions/35811053/
>>  >
>>  >> Hundreds of votes for something immensely simple, that with Qt
>>  >> containers is also immensely more readable. Ease of use has a lot more
>>  >> value than performance to many people. A thought: how many comments did
>>  >> get the blog post that you did on making QRegion iterable? And how many
>>  >> the one about the removal of the foreach macro?
> --
> Marc Mutz <marc.mutz at kdab.com> | Senior Software Engineer
> KDAB (Deutschland) GmbH & Co.KG, a KDAB Group Company
> Tel: +49-30-521325470
> KDAB - The Qt, C++ and OpenGL Experts
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