Re: [E-devel] Crash using C++ Layout signal API

Hello Andreas

On Thu, Jun 24, 2021 at 4:22 PM Andreas Volz <[email protected]> wrote:
>
> I just add another question now as it's working without crash. :-)
>
> With signal_callback_add() I could only add a C function or static C++
> member function. But practically I design my callback functions to
> hand-over them the this-pointer that they could access members.
>
> But here is no possibility to add a data pointer to
> signal_callback_add() that is hand-over to the callback. Any ideas to
> attach the this pointer to the Eo object and then get it back from the
> efl::layout::Signal from inside the callback?
>
> BTW: I would love if the C++ interface would use libsigc++ as signaling
> system. It's so a well designed signaling system, documented and easy to
> use.

You can use any function object, not just pointers. You can use a
lambda for example:

```
std::shared_ptr<MyClass> my_object;
layout.signal_callback_add("edje", "func", [=] (auto&& signal, auto&&
emission, auto&& source) { my_object->do_something(signal, emission,
source); });
```

Kind regards,

> Am 23.06.21 um 07:36 schrieb Andreas Volz:
> > Hello together,
> >
> > after some waiting time I would like to ask here if some other user
> > could at least verify the same crash with C++ API that I described here:
> >
> > https://phab.enlightenment.org/T8943
> >
> > If I'm not strongly misusing the API than it's a very basic error. Just
> > loading an Edje file into a Layout.
> >
> > Would be good to know someone else does see the same.
> >
> > Do you know a workaround to come around this? Maybe use another C++
> > compatible API / mix with C API to continue work on my application?
> >
> > regards
> > Andreas
> >
> >
> > _______________________________________________
> > enlightenment-devel mailing list
> > [email protected]
> > https://lists.sourceforge.net/lists/listinfo/enlightenment-devel
>
>
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