connect_notify()

[Matthias Kaeppler <nospam digitalraid com>]

Hello,

I want a context menu to popup when the user right-clicks on a tree 
view. So I looked up signal_button_press_event() and I was told to 
either derive my own view from TreeView (I don't want that) and override 
the default handler, or use connect_notify() instead.
Well, what does this mysterious function do? Googling for it turned out 
that it has something to do with coverting non-void return types to void 
return types of the signal handler (though I don't understand why this 
is needed at all).

Anyway, if I use this function to connect my own signal handler (as 
usual with sigc::mem_fun), the compiler complains about mismatching 
return types (the errors message is pretty long-winded, STL style, you 
don't want to see it I guess...).
Instead of posting the error message from g++, here's the code which 
caused it:

// m_view is a TreeView

m_view.signal_button_press_event().connect_notify( sigc::mem_fun( *this, 
&FileBrowser::on_rmb_clicked ) );

// ...

void FileBrowser::on_rmb_clicked()
{
   // ...
}

I don't get what's wrong here.

--
Matthias Kaeppler