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## Acknowledgements

`ref` and `cref` were originally part of the Tuple library by Jaakko Järvi. They were "promoted to boost:: status" by Peter Dimov because they are generally useful. Douglas Gregor and Dave Abrahams contributed `is_reference_wrapper` and `unwrap_reference`.

| Copyright © 1999, 2000 Jaakko Järvi Copyright © 2001, 2002 Peter Dimov Copyright © 2002 David Abrahams