C++ structs & inheritance, or something

What's this:

Code:

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class DemoTree : public Gtk::TreeView
{
  private:
    struct Columns : public Gtk::TreeModelColumnRecord           
    {
      Gtk::TreeModelColumn<Glib::ustring> column1;
      Gtk::TreeModelColumn<Glib::ustring> color;
      Columns() { add(column1);add(color); }
    };
    Columns columns;

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I mean, it looks like a struct definition, but what is the significance of the ": public Gtk::TreeModelColumnRecord"? (which a Gtk::TreeModelColumnRecord is not a struct...)

A struct is a class, in C++....

Quote:

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Originally Posted by tabstop

A struct is a class, in C++....

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:p makes sense. They should really make that clearer somewhere.

Quote:

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Originally Posted by MK27

:p makes sense. They should really make that clearer somewhere.

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The difference is that structs have everything public by default and classes have everything private by default.