Re: [gtkmm] static Glib::RefPtr<>'s

[Bowie Owens <bowie owens csiro au>]

Jay Camp wrote:

> I'm trying to create a singleton class to use for a variable that's a
> RefPtr<>.  It compiles, but fails to link when used.  Are there any
> problems with using a static RefPtr<> in this way?  The code isn't very
> long, so I have pasted it below.  Any tips would be much appreciated:
>  
Is this all your code? Your program won't link because you have declared 
but not defined Glade::instance. You need a line in your .cc file:

Glib::RefPtr<Gnome::Glade::Xml> Glade::instance;


> FILE:  Glade.h
>
> #ifndef GLADE_H
> #define GLADE_H
>
> #include <glibmm.h>
> #include <libglademm.h>
>
> class Glade {
>
> 	public:
> 		static Glib::RefPtr<Gnome::Glade::Xml> get();
>
> 	protected:
> 		Glade();
> 		Glade(const Glib::RefPtr<Gnome::Glade::Xml>&);
> 		Glade& operator= (const
> 				 Glib::RefPtr<Gnome::Glade::Xml>&);
>
> 	private:
> 		static Glib::RefPtr<Gnome::Glade::Xml> instance;
> };
>
> #endif
>
> FILE:  Glade.cc
>
> #include "Glade.h"
>
> Glib::RefPtr<Gnome::Glade::Xml> Glade::get() {
> 	
> 	if (instance)
> 		instance = Gnome::Glade::Xml::create("glade/k5.glade");
>
> 	return instance;
> }
>
> Glade::Glade() { }
>
>
>  


--
Bowie Owens

CSIRO Mathematical & Information Sciences
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email  : Bowie Owens csiro au