Checking for null
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## Checking for null

Just like normal pointers, you can check whether a RefPtr points to anything.

    Glib::RefPtr<Gtk::TreeModel> refModel = m_TreeView.get_model();
    if(refModel)
    {
      int cols_count = refModel->get_n_columns();
      ...
    }

But unlike normal pointers, RefPtrs are automatically initialized to null so you don't need to remember to do that yourself.

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