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+/*=============================================================================
+ BOOST_PP_VARIADICS version of BOOST_PP_IS_SEQ inspired from
+ boost/mpl/aux_/preprocessor/is_seq.hpp, original copyrights goes to :
+
+ Copyright Paul Mensonides 2003
+ Copyright Aleksey Gurtovoy 2003-2004
+
+ 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)
+
+==============================================================================*/
+
+#ifndef BOOST_FUSION_ADAPTED_STRUCT_DETAIL_PREPROCESSOR_IS_SEQ_HPP
+#define BOOST_FUSION_ADAPTED_STRUCT_DETAIL_PREPROCESSOR_IS_SEQ_HPP
+
+#include <boost/preprocessor/seq/size.hpp>
+#include <boost/preprocessor/arithmetic/dec.hpp>
+#include <boost/preprocessor/punctuation/paren.hpp>
+#include <boost/preprocessor/cat.hpp>
+#include <boost/preprocessor/config/config.hpp>
+
+#if BOOST_PP_VARIADICS
+
+#define BOOST_FUSION_PP_IS_SEQ(seq) BOOST_PP_CAT(BOOST_FUSION_PP_IS_SEQ_, \
+ BOOST_FUSION_PP_IS_SEQ_0 seq BOOST_PP_RPAREN())
+
+#define BOOST_FUSION_PP_IS_SEQ_0(...) \
+ BOOST_FUSION_PP_IS_SEQ_1(__VA_ARGS__
+
+#define BOOST_FUSION_PP_IS_SEQ_ALWAYS_0(...) \
+ 0
+
+#define BOOST_FUSION_PP_IS_SEQ_BOOST_FUSION_PP_IS_SEQ_0 \
+ BOOST_FUSION_PP_IS_SEQ_ALWAYS_0(
+
+#define BOOST_FUSION_PP_IS_SEQ_BOOST_FUSION_PP_IS_SEQ_1(...) \
+ 1
+
+#endif // BOOST_PP_VARIADICS
+
+#endif