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- /*=============================================================================
- Copyright (c) 2001-2011 Joel de Guzman
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- ==============================================================================*/
- #if !defined(FUSION_TAG_OF_09232005_0845)
- #define FUSION_TAG_OF_09232005_0845
- #include <boost/fusion/support/config.hpp>
- #include <boost/utility/enable_if.hpp>
- #include <boost/type_traits/remove_const.hpp>
- #include <boost/fusion/support/tag_of_fwd.hpp>
- #include <boost/fusion/support/detail/is_mpl_sequence.hpp>
- #include <boost/mpl/has_xxx.hpp>
- #include <boost/mpl/identity.hpp>
- #include <boost/mpl/assert.hpp>
- #include <boost/mpl/bool.hpp>
- #include <boost/mpl/if.hpp>
- #include <boost/config/no_tr1/utility.hpp>
- namespace boost
- {
- template <typename T, std::size_t N>
- class array; // forward
- namespace tuples
- {
- struct null_type;
- template <
- class T0, class T1, class T2, class T3, class T4,
- class T5, class T6, class T7, class T8, class T9
- >
- class tuple;
- template <class Head, class Tail>
- struct cons;
- }
- }
- namespace boost { namespace fusion
- {
- struct non_fusion_tag;
- struct mpl_sequence_tag;
- namespace detail
- {
- BOOST_MPL_HAS_XXX_TRAIT_DEF(fusion_tag)
- template <typename Sequence, typename Active>
- struct tag_of_impl
- : mpl::if_<fusion::detail::is_mpl_sequence<Sequence>,
- mpl::identity<mpl_sequence_tag>,
- mpl::identity<non_fusion_tag> >::type
- {};
- template <typename Sequence>
- struct tag_of_impl<
- Sequence
- , typename boost::enable_if<detail::has_fusion_tag<Sequence> >::type>
- {
- typedef typename Sequence::fusion_tag type;
- };
- }
- namespace traits
- {
- template <typename Sequence, typename Active>
- struct tag_of
- : boost::fusion::detail::tag_of_impl<Sequence, Active>
- {};
- }
- namespace detail
- {
- template<typename T>
- struct tag_of
- : traits::tag_of<typename remove_const<T>::type>
- {};
- }
- }}
- #endif
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