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_WRAP_METHOD(void set_sort_column(int sort_column_id, SortType order),
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gtk_tree_sortable_set_sort_column_id)
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/** This callback should return -1 if a compares before b, 0 if they compare equal, 1 if a compares after b.
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/** This callback should return -1 if a compares before b, 0 if they compare equal, 1 if a compares after b.
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* For instance, int on_sort_compare(const Gtk::TreeModel::iterator& a, const Gtk::TreeModel::iterator& b);
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typedef sigc::slot<int, const Gtk::TreeModel::iterator&, const Gtk::TreeModel::iterator&> SlotCompare;