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