| /*============================================================================= |
| Copyright (c) 2001-2006 Joel de Guzman |
| Copyright (c) 2005-2006 Dan Marsden |
| |
| 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(BOOST_FUSION_CATEGORY_OF_IMPL_20060217_2141) |
| #define BOOST_FUSION_CATEGORY_OF_IMPL_20060217_2141 |
| |
| #include <boost/fusion/support/detail/mpl_iterator_category.hpp> |
| #include <boost/mpl/begin_end.hpp> |
| #include <boost/mpl/is_sequence.hpp> |
| #include <boost/static_assert.hpp> |
| |
| namespace boost { namespace fusion { |
| |
| namespace detail |
| { |
| template <typename T> |
| struct mpl_sequence_category_of |
| { |
| // assumes T is an mpl sequence |
| // there should be no way this will ever be |
| // called where T is an mpl iterator |
| |
| BOOST_STATIC_ASSERT(mpl::is_sequence<T>::value); |
| typedef typename |
| mpl_iterator_category< |
| typename mpl::begin<T>::type::category |
| >::type |
| type; |
| }; |
| } |
| |
| struct mpl_sequence_tag; |
| |
| namespace extension |
| { |
| template<typename Tag> |
| struct category_of_impl; |
| |
| template<> |
| struct category_of_impl<mpl_sequence_tag> |
| { |
| template<typename T> |
| struct apply |
| : detail::mpl_sequence_category_of<T> |
| {}; |
| }; |
| } |
| }} |
| |
| #endif |