[Development] Views

Lars Knoll lars.knoll at qt.io
Thu Jun 6 15:49:02 CEST 2019

> On 6 Jun 2019, at 15:36, Mutz, Marc via Development <development at qt-project.org> wrote:
> On 2019-06-06 15:14, Konstantin Tokarev wrote:
> [...]
>> There is a principle of single level of abstraction [1], and inline
>> implementation
>> of flat map can be viewed of violation of such principle. If flat map
>> implementations
>> were kept speparately, it would indeed make code easier to read and maintain.
>> [1] http://principles-wiki.net/principles:single_level_of_abstraction
> The code factors the setting and lookup into functions already. A function is an abstraction. If you're concerned about a function that calls find_if and then uses the result, how do you rate this one: https://code.woboq.org/qt5/qtbase/src/widgets/kernel/qgesturemanager.cpp.html#_ZN15QGestureManager26filterEventThroughContextsERK9QMultiMapIP7QObjectN2Qt11GestureTypeEEP6QEvent
> It's using _all_ the nice abstractions!
> Puts some stuff into perspective, doesn't it?

Yes, the code in QGestureManager sucks. Basically because it abuses our data structures in a really bad way.

But let’s not use the worst example you can find in Qt’s code base as a comparison. Unmaintainable code in one place doesn’t justify doing whatever you want in other places.


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