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Includes all the headers needed to setup tag-dispatching.

@copyright Louis Dionne 2013-2017
Distributed under the Boost Software License, Version 1.0.
(See accompanying file or copy at


#include <boost/hana/core/tag_of.hpp>
#include <boost/hana/detail/dispatch_if.hpp>
#include <boost/hana/core/default.hpp>
#include <boost/hana/core/when.hpp>