marc at kdab.com
Thu Jun 6 16:51:46 CEST 2019
On 2019-06-06 15:49, Lars Knoll wrote:
>> 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 , and inline
>>> of flat map can be viewed of violation of such principle. If flat map
>>> were kept speparately, it would indeed make code easier to read and
>>>  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:
>> 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.
IMO, the code sucks because it conflates algorithms and data structures.
Wirth's book, however, is called Algorihms + Data Structures =
Programmes, not Data Structures = Programmes. Yet, that is exactly what
I feel is asked of me here: to hide the algorithms in a data structure.
But the end consequence of this is ... qgesturemanager.cpp.
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