[Qt-interest] emitting signal from another class

[John McClurkin]

Sajjad wrote:
> Hello forum,
> 
> I have a singleton class whose data are shared between different other 
> classes. The Shared class has some signals defined.
> 
> I am getting the following error when i try to emit sigal of the shared 
> class from another class:
> 
> 
> 
> ***********************************
> 
> /home/studenter/sajis997/QtStuff/transformation/SharedWidgetData.h:79: 
> error: ‘void SharedWidgetData::modelViewMatrixChanged()’ is protected
> 
> 
> 
> ***********************************
> 
> 
> the code that generated the error is follows:
> 
> 
> ******************************************
> 
> .....
> .....
> emit pSharedData->modelViewMatrixChanged();
> ......
> ......
> 
> ******************************************
> 
> It seems that the signals are by default protected. Is that so or i am 
> getting it somewhere wrong.
> 

You are getting it wrong. Signals can be public, protected, or private, 
just like any other class member. In your case you need to declare the 
signal public.