[UFO-devel] Re: help me

[Johannes S. <sch...@us...>]

Hi Lidia,

sorry for the late reply ...

Am Dienstag, 28. Februar 2006 19:11 schrieb LIDIAa ARISTA SANCHEZ:
> Can you help me?

I hope I can :)

> I don't understand signal and slot, someday I prove QT and I  understand
> but if I puth in me class someone slot, it said :
>
> no matching function for call to `slot(<unknown type>)'
> candidates are: ufo::USlot0 ufo::slot(void (*)())
>
> Why?, me instruction is:
> combo->sigActivated().connect(slot(DrawMesh::&activar));

If you connect to a member method of a class, you have to provide 2 things:
a) A reference to an object of that class
b) A pointer to a member method

Try something like this:
combo->sigActivated().connect(slot(*combo, &DrawMesh::activar));

As a side note:
I want to achieve what is called delegates in other languages. Main point is 
to provide an object oriented way of plain C call backs (function pointers). 
If you want more info on this topic, search for C++ and delegates or member 
function pointer etc.
But you don't need that info if you just want to use it :)

> I don't understand  very well how I use the next clases UEvent,
> UObjectSlotNode, USlotBase, USlotEven,
> but you said a Dr. Luis M. de la Cruz S.
>
> If you are using Class methods, you need an object slot (in
> uobjectslot.hpp).
>
> but I don't understand this class.

You should use any of the slot class yourself. All the work should be done by 
the overloaded function: slot.

Hope that helps.
If it is still unclear, don't hesitate to ask.

Regards,
Johannes