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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_IS_SEQUENCE_05052005_1002)
#define FUSION_IS_SEQUENCE_05052005_1002
#include <boost/fusion/support/config.hpp>
#include <boost/fusion/support/sequence_base.hpp>
#include <boost/fusion/support/tag_of.hpp>
#include <boost/mpl/is_sequence.hpp>
#include <boost/mpl/or.hpp>
#include <boost/mpl/bool.hpp>
#include <boost/type_traits/is_convertible.hpp>
#include <boost/type_traits/is_same.hpp>
namespace boost { namespace fusion
{
// Special tags:
struct non_fusion_tag;
struct boost_tuple_tag; // boost::tuples::tuple tag
struct boost_array_tag; // boost::array tag
struct mpl_sequence_tag; // mpl sequence tag
struct std_pair_tag; // std::pair tag
namespace extension
{
template <typename T>
struct is_sequence_impl
{
template <typename Sequence>
struct apply
: is_convertible<Sequence, detail::from_sequence_convertible_type>
{};
};
template <>
struct is_sequence_impl<non_fusion_tag>
{
template <typename T>
struct apply : mpl::false_ {};
};
template <>
struct is_sequence_impl<boost_tuple_tag>;
template <>
struct is_sequence_impl<boost_array_tag>;
template <>
struct is_sequence_impl<mpl_sequence_tag>;
template <>
struct is_sequence_impl<std_pair_tag>;
}
namespace traits
{
template <typename T>
struct is_sequence
: mpl::bool_<
(bool)extension::is_sequence_impl<
typename fusion::detail::tag_of<T>::type
>::template apply<T>::type::value
>
{};
template <typename Sequence, typename Enable = void>
struct is_native_fusion_sequence
: is_convertible<Sequence, detail::from_sequence_convertible_type>
{};
}
}}
#endif
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