| /*============================================================================= |
| Copyright (c) 2001-2006 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/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) |
| } |
| |
| namespace traits |
| { |
| template <typename Sequence, typename Active> |
| struct tag_of |
| : 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<Sequence, typename boost::enable_if<detail::has_fusion_tag<Sequence> >::type> |
| { |
| typedef typename Sequence::fusion_tag type; |
| }; |
| } |
| |
| namespace detail |
| { |
| template<typename T> |
| struct tag_of |
| : traits::tag_of<typename remove_const<T>::type> |
| {}; |
| } |
| }} |
| #endif |