[gtkmm] Re: tutorial appendix B on signals misleading

[Nathan Hurst <njh hawthorn csse monash edu au>]

Murray Cumming Comneon com wrote:

> Yes. Thanks for noticing that. Feel free to submit a patch. It should
> explain it and also explain that Gtk widgets do this automatically.
>
> Murray Cumming
> www.murrayc.com
> murrayc usa net
>  

--- docs/tutorial/gtkmm-tut-with-examples.xml   2004-01-15 
22:22:35.000000000 +1100
+++ docs/tutorial/gtkmm-tut-with-examples-njh.xml       2004-01-15 
23:08:25.000000000 +1100
@@ -11005,7 +11005,7 @@
<programlisting>
void on_button_clicked();

-class some_class
+class some_class : public SigC::Object
{
    void on_button_clicked();
};
@@ -11029,7 +11029,7 @@
second argument is a pointer to one of its methods.  This particular
version of <literal>slot()</literal> creates a slot which will, when 
"called", call
the pointed-to method of the specified object, in this case
-some_object.on_button_clicked().
+some_object.on_button_clicked().  Note that some_class must be derived 
from <literal>SigC::Object</literal> - most classes will be derived from 
a Gtk::Widget which includes <literal>SigC::Object</literal> as an ancestor.
</para>

<para>