/*============================================================================= | |
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 |