Appendix A. The RefPtr smartpointer

# Appendix A. The RefPtr smartpointer

`Glib::RefPtr` is a smartpointer. Specifically, it is a reference-counting smartpointer. You might be familiar with `std::auto_ptr<>`, `std::unique_ptr<>` and `std::shared_ptr<>`, which are also smartpointers. `Glib::RefPtr<>` is similar to `std::shared_ptr<>`, which is also reference-counting. `Glib::RefPtr<>` was introduced long before there was a reference-counting smartpointer in the C++ Standard Library.

Reference

A smartpointer acts much like a normal pointer. Here are a few examples.

## Copying

You can copy `RefPtr`s, just like normal pointers. But unlike normal pointers, you don't need to worry about deleting the underlying instance.

    Glib::RefPtr<Gdk::Pixbuf> refPixbuf = Gdk::Pixbuf::create_from_file(filename);
    Glib::RefPtr<Gdk::Pixbuf> refPixbuf2 = refPixbuf;

Of course this means that you can store `RefPtr`s in standard containers, such as `std::vector` or `std::list`.

    std::list< Glib::RefPtr<Gdk::Pixbuf> > listPixbufs;
    Glib::RefPtr<Gdk::Pixbuf> refPixbuf = Gdk::Pixbuf::create_from_file(filename);
    listPixbufs.push_back(refPixbuf);

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