[Development] Go's "defer" statement for C++/Qt

[Tor Arne Vestbø]

https://doc.qt.io/qt-5/qscopeguard.html 😊

Tor Arne 

> On 7 Mar 2019, at 18:01, Volker Hilsheimer <volker.hilsheimer at qt.io> wrote:
> 
> Ahoy,
> 
> In what little development I’ve done in golang, I appreciated the “defer” statement as a means to write cleaner code. Basically, defer schedules a statement for execution when the stack unwinds.
> 
> https://tour.golang.org/flowcontrol/12
> 
> We have several specialized helper classes in Qt for similar purposes, f.ex QMutexLocker and friends, or the internal QBoolBlocker [1]. Seeing the various specialized classes we have, I thought that something generic in Qt could be useful to have (although our specialised classes provide some additional convenience and/or logic).
> 
> So, I pushed a few lines code to
> 
> https://git.qt.io/vohilshe/qt_defer
> 
> Would like to hear what you think.
> 
> Perhaps someone can find ways to make this more elegant without introducing tons of preprocessor/macro shenanigans, or perhaps even without depending on C++17's implicit template argument deduction (without enabling C++17 in the config this doesn't build for me, even though I don’t use auto in the template paramter list).
> 
> 
> Cheers,
> Volker
> 
> 
> [1] which was requested to be made public in https://bugreports.qt.io/browse/QTBUG-38575
> 
> 
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