[sigc] Interesting minor libsigc++ 2 problems

[Murray Cumming <murrayc murrayc com>]

These are not big problems, but they are interesting when porting to
libsigc++ 2:

1. In libsigc++ 1.2 you can do  button.signal_clicked().connect(*this,
&Gtk::Widget::hide)
but in libsigc++ 2 you need to write a separate intermediate method to
handle the signal and then call hide().

2. In libsigc++ 1.2 you can override a method like so:
  void do_something(const Slot0<void>& slot);
  void do_something(const Slot1<void, int>& slot);
but in libsigc++ 2 that is ambiguous when you try to call
do_something().

Sorry for not giving actual compiler errors - I'm rushed.
-- 
Murray Cumming
www.murrayc.com
murrayc murrayc com