[Development] Question about QCoreApplicationData::*_libpaths

[Mathias Hasselmann]

Am 05.01.2016 um 14:41 schrieb Thiago Macieira:
> On Tuesday 05 January 2016 15:37:51 Marc Mutz wrote:
>> On Tuesday 05 January 2016 12:56:55 Ulf Hermann wrote:
>>> avoid paying the price of constructing a QStringList if they are unused.
>>
>> That's what I was wondering about: constructing a QStringList is just a copy
>> of a pointer, and while not totally free, it is next to nothing compared to
>> the additional heap allocation of a new'ed QStringList...
>
> It's still a good enough trade-off, considering we'd need to keep a bool
> elsewhere.
>
>> (we need std::optional :)
>
> Aye.

What speaks against shipping a copy of std(::experimental)::optional and 
using that one when the configure script notices std::optional not being 
available yet? How about letting qmake picking the right std::optional 
when configuring a project?

Ciao,
Mathias