Squashed 'third_party/boostorg/preprocessor/' content from commit 56090c5

Change-Id: I8c0a13225778c3751a35945439d5304bd9e639ef
git-subtree-dir: third_party/boostorg/preprocessor
git-subtree-split: 56090c56b5c78418b6dbe8c3c2ba576395152f83
diff --git a/include/boost/preprocessor/detail/split.hpp b/include/boost/preprocessor/detail/split.hpp
new file mode 100644
index 0000000..f28a723
--- /dev/null
+++ b/include/boost/preprocessor/detail/split.hpp
@@ -0,0 +1,35 @@
+# /* **************************************************************************
+#  *                                                                          *
+#  *     (C) Copyright Paul Mensonides 2002.
+#  *     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_PREPROCESSOR_DETAIL_SPLIT_HPP
+# define BOOST_PREPROCESSOR_DETAIL_SPLIT_HPP
+#
+# include <boost/preprocessor/config/config.hpp>
+#
+# /* BOOST_PP_SPLIT */
+#
+# if BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MWCC()
+#    define BOOST_PP_SPLIT(n, im) BOOST_PP_SPLIT_I((n, im))
+#    define BOOST_PP_SPLIT_I(par) BOOST_PP_SPLIT_II ## par
+#    define BOOST_PP_SPLIT_II(n, a, b) BOOST_PP_SPLIT_ ## n(a, b)
+# elif BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_MSVC()
+#    define BOOST_PP_SPLIT(n, im) BOOST_PP_SPLIT_I(n((im)))
+#    define BOOST_PP_SPLIT_I(n) BOOST_PP_SPLIT_ID(BOOST_PP_SPLIT_II_ ## n)
+#    define BOOST_PP_SPLIT_II_0(s) BOOST_PP_SPLIT_ID(BOOST_PP_SPLIT_0 s)
+#    define BOOST_PP_SPLIT_II_1(s) BOOST_PP_SPLIT_ID(BOOST_PP_SPLIT_1 s)
+#    define BOOST_PP_SPLIT_ID(id) id
+# else
+#    define BOOST_PP_SPLIT(n, im) BOOST_PP_SPLIT_I(n)(im)
+#    define BOOST_PP_SPLIT_I(n) BOOST_PP_SPLIT_ ## n
+# endif
+#
+# define BOOST_PP_SPLIT_0(a, b) a
+# define BOOST_PP_SPLIT_1(a, b) b
+#
+# endif