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

Hello Andreas,

On Fri, Jun 25, 2021 at 7:15 PM Andreas Volz <[email protected]> wrote:
>
>
>
> Am 24.06.21 um 21:25 schrieb Felipe Magno de Almeida:
> > 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); });
> > ```
>
>
> This is a very good idea! Works great.
>
> Just a question about the signal prototype. I used this one and it
> works. I tried to use type std::string as emission/source but this
> result in another crash. Any ideas why conversation from
> efl::eina::basic_string_view<char>  to std::string has problems?
>
> void allFunc2(efl::layout::Signal s, efl::eina::basic_string_view<char>
> emission, efl::eina::basic_string_view<char>  source)

I have to investigate. That should not happen.

-- 
Felipe Magno de Almeida
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