I have begun porting my application to gtkmm2, and looked in the PORTING
file first, however, the description for the sigc++ changes is very vague:

 11 * Use new signal connection syntax:
 12    e.g. change
 13    button.clicked.connect(SigC::slot(this
 14    to
 15    button.signal_clicked().connect(SigC::slot(*this

When I first read it, I saw that clicked. was changed to signal_clicked()
and thought that was it. I didn't notice the end of the line where it
stated this instead of *this.

It would be nice if this was clarified further, maybe add an extra item to
the PORTING file with an example.

It's almost impossible to understand the compiler error message you get
when just using 'this'.