function type

[Ignacio Nodal]

Hi, i'm writing a class in C++ which has a member-function to add a
button into the widget. It's declared like this:

gboolean AddButton(gint* id, gchar* label, function_type callback,
gpointer data);

Which type should I use for the callback? Something like GtkSignalFunc??

Thanks,
        
        Ignacio Nodal

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