What does `class HelloWorld : public Gtk::Window` mean?

Question

I\'m following the Gtk \"Hello World\" tutorial found here, and I\'ve come across a line in a class declaration I\'ve never seen before (I\'ve only been learning to program for

Answer 1

I just want to point out that you should either be using the 3.0 branch of gtkmm or you should use the stable branch of the tutorial.link text

The 3.0 branch of gtkmm is still under development, and you should expect a few "surprises" now and then.