Re: Static signals (was:(no subject) )

[Antonio Coralles]

[EMAIL PROTECTED] wrote:

Message: 5
Date: Wed, 16 Mar 2005 08:11:06  0100
From: Antonio Coralles <[EMAIL PROTECTED] 
<mailto:[EMAIL PROTECTED]>>
> I have a derived widget - derived from an EventBox. It has a funtion
"void
> doShowHidden(bool);".
>
> There are several instances of these derived widgets on different
notebook
> pages - so it is not easy to get direct access to them. So is is 
possible
> that I could call all their doShowHidden(bool) functions with a signal?
> They will all be either true or false - whatever the state of the
checkbox
> is.
>
> So... how could I do that? All the examples of signals I've seen call
> functions within the same class.
>
> -Sud.
One way of doing this is the following (there may be better ones): Add a
static signal to your class, und connect to that static signal in your
constructor(s). If you want then to sent a signal to all instances, just
trigger the static one ...
antionio

I /think/ I get what you are saying... but doesn't a static signal require
a staic function? And static functions can only work with other static
variables and functions - nothing can happen to specific instances...
Static functions in classes must not acces non-static data, but 
non-static methods may acces static variables/functions.

And I've not read that signals can propagate to children in libsigc  ...
It may be easier to maintain a list of pointers somewhere, so I can have
direct access...
-Sud.
_______________________________________________
What i mean is something like this:
class Example
{
   public:
   Example()
   {
      signalForAllExamples().connect(sigc::mem_fun(*this, 
&Example::triggerMe));
   }
   Example(const Example& copyMe) { /* the same like for Example() */ }
   void triggerMe() { /* do something */ }  

   static sigc::signal<void> signalForAllExamples() { return 
sig_forAllExamples_; }

   private:
   static sigc::signal<void> sig_forAllExamples_;
};
A simple Example::signalForAllExamples().emit() should then do what you 
want ....

antonio

  
  
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