[gtkmm] beginnerīs question

["Andreas B. Thun" <abt gmx de>]

Hi mailinglist,

I am not very good in C++, maybe someone can help me.

I have a class ConstraintGui with a private member
m_TreeBrowserBox.
The constructor of a friend class ConstraintTypesBrowser
creates a TreeBrowserBox I want to assign to m_TreeBrowserBox.

I am doing something wrong there, because
 guiRef.m_TreeBrowserBox.pack_start(myTreeBrowserBox);
will not compile:
 Gtk::VBox& Gtk::VBox::operator=(const Gtk::VBox&)' discards qualifiers

Can someone throw light on this?

class ConstraintGui : public Gtk::Window {

  public:
    ConstraintGui();
    virtual ~ConstraintGui();

	friend class ConstraintTypesBrowser;

  private:
	Gtk::VBox m_TreeBrowserBox;

}; // class



ConstraintTypesBrowser::ConstraintTypesBrowser(
  const ConstraintGui &constraintGuiRef
  :
  m_Frame("my frame:")
{
  ...

  // Created a box I want to assign to m_TreeBrowserBox
  	
  // How can I assing myTreeBrowserBox to m_TreeBrowserBox?
  // I am a friend class so I should have access to the
  // private member m_TreeBrowserBox of class ConstraintGui
  guiRef.m_TreeBrowserBox.pack_start(myTreeBrowserBox); // will not compile
}