[Development] Use of std::function in Qt API

[Lars Knoll]

> On 25 Apr 2017, at 15:51, Thiago Macieira <thiago.macieira at intel.com> wrote:
> 
> Em terça-feira, 25 de abril de 2017, às 07:59:03 -03, Marc Mutz escreveu:
>> What's holding us back?
> 
> At this point, inertia.
> 
> I've already lifted my objection in the grounds that no one in the Linux 
> sphere cares about compatibility between libstdc++ and libc++ without a 
> "rebuild the world" step.
> 
> Using the standard library requires a QUIP with the allowed classes and the 
> allowed uses of those classes, as I'm sure we'll find incomplete or non-
> standard implementations of them in the many platforms and compilers we need 
> to support.

We concluded that we don’t want to be responsible for the stdlib breaking compatibility or compatibility between libstdc++ and libc++. So in that respect, we should be able to more freely to use more of the standard library, as long as the parts we’re using are supported on all our platforms.

But I agree with Thiago, that we should have this written down in a QUIP, ideally with a list of the classes we consider ok to use in our APIs.

Cheers,
Lars