http://d.puremagic.com/issues/show_bug.cgi?id=9511



--- Comment #4 from Martin Nowak <c...@dawg.eu> 2013-02-14 18:11:47 PST ---
Sometimes tag dispatching is used for the same purpose but it's not automated
and definitely looses covariance.
http://www.boost.org/community/generic_programming.html#tag_dispatching

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