diff --git a/boost/preprocessor/slot/detail/slot4.hpp b/boost/preprocessor/slot/detail/slot4.hpp
new file mode 100644
index 0000000..9aa4d8a
--- /dev/null
+++ b/boost/preprocessor/slot/detail/slot4.hpp
@@ -0,0 +1,267 @@
+# /* **************************************************************************
+#  *                                                                          *
+#  *     (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)
+#  *                                                                          *
+#  ************************************************************************** */
+#
+# /* See http://www.boost.org for most recent version. */
+#
+# include <boost/preprocessor/slot/detail/shared.hpp>
+#
+# undef BOOST_PP_SLOT_4
+#
+# undef BOOST_PP_SLOT_4_DIGIT_1
+# undef BOOST_PP_SLOT_4_DIGIT_2
+# undef BOOST_PP_SLOT_4_DIGIT_3
+# undef BOOST_PP_SLOT_4_DIGIT_4
+# undef BOOST_PP_SLOT_4_DIGIT_5
+# undef BOOST_PP_SLOT_4_DIGIT_6
+# undef BOOST_PP_SLOT_4_DIGIT_7
+# undef BOOST_PP_SLOT_4_DIGIT_8
+# undef BOOST_PP_SLOT_4_DIGIT_9
+# undef BOOST_PP_SLOT_4_DIGIT_10
+#
+# if BOOST_PP_SLOT_TEMP_10 == 0
+#    define BOOST_PP_SLOT_4_DIGIT_10 0
+# elif BOOST_PP_SLOT_TEMP_10 == 1
+#    define BOOST_PP_SLOT_4_DIGIT_10 1
+# elif BOOST_PP_SLOT_TEMP_10 == 2
+#    define BOOST_PP_SLOT_4_DIGIT_10 2
+# elif BOOST_PP_SLOT_TEMP_10 == 3
+#    define BOOST_PP_SLOT_4_DIGIT_10 3
+# elif BOOST_PP_SLOT_TEMP_10 == 4
+#    define BOOST_PP_SLOT_4_DIGIT_10 4
+# elif BOOST_PP_SLOT_TEMP_10 == 5
+#    define BOOST_PP_SLOT_4_DIGIT_10 5
+# elif BOOST_PP_SLOT_TEMP_10 == 6
+#    define BOOST_PP_SLOT_4_DIGIT_10 6
+# elif BOOST_PP_SLOT_TEMP_10 == 7
+#    define BOOST_PP_SLOT_4_DIGIT_10 7
+# elif BOOST_PP_SLOT_TEMP_10 == 8
+#    define BOOST_PP_SLOT_4_DIGIT_10 8
+# elif BOOST_PP_SLOT_TEMP_10 == 9
+#    define BOOST_PP_SLOT_4_DIGIT_10 9
+# endif
+#
+# if BOOST_PP_SLOT_TEMP_9 == 0
+#    define BOOST_PP_SLOT_4_DIGIT_9 0
+# elif BOOST_PP_SLOT_TEMP_9 == 1
+#    define BOOST_PP_SLOT_4_DIGIT_9 1
+# elif BOOST_PP_SLOT_TEMP_9 == 2
+#    define BOOST_PP_SLOT_4_DIGIT_9 2
+# elif BOOST_PP_SLOT_TEMP_9 == 3
+#    define BOOST_PP_SLOT_4_DIGIT_9 3
+# elif BOOST_PP_SLOT_TEMP_9 == 4
+#    define BOOST_PP_SLOT_4_DIGIT_9 4
+# elif BOOST_PP_SLOT_TEMP_9 == 5
+#    define BOOST_PP_SLOT_4_DIGIT_9 5
+# elif BOOST_PP_SLOT_TEMP_9 == 6
+#    define BOOST_PP_SLOT_4_DIGIT_9 6
+# elif BOOST_PP_SLOT_TEMP_9 == 7
+#    define BOOST_PP_SLOT_4_DIGIT_9 7
+# elif BOOST_PP_SLOT_TEMP_9 == 8
+#    define BOOST_PP_SLOT_4_DIGIT_9 8
+# elif BOOST_PP_SLOT_TEMP_9 == 9
+#    define BOOST_PP_SLOT_4_DIGIT_9 9
+# endif
+#
+# if BOOST_PP_SLOT_TEMP_8 == 0
+#    define BOOST_PP_SLOT_4_DIGIT_8 0
+# elif BOOST_PP_SLOT_TEMP_8 == 1
+#    define BOOST_PP_SLOT_4_DIGIT_8 1
+# elif BOOST_PP_SLOT_TEMP_8 == 2
+#    define BOOST_PP_SLOT_4_DIGIT_8 2
+# elif BOOST_PP_SLOT_TEMP_8 == 3
+#    define BOOST_PP_SLOT_4_DIGIT_8 3
+# elif BOOST_PP_SLOT_TEMP_8 == 4
+#    define BOOST_PP_SLOT_4_DIGIT_8 4
+# elif BOOST_PP_SLOT_TEMP_8 == 5
+#    define BOOST_PP_SLOT_4_DIGIT_8 5
+# elif BOOST_PP_SLOT_TEMP_8 == 6
+#    define BOOST_PP_SLOT_4_DIGIT_8 6
+# elif BOOST_PP_SLOT_TEMP_8 == 7
+#    define BOOST_PP_SLOT_4_DIGIT_8 7
+# elif BOOST_PP_SLOT_TEMP_8 == 8
+#    define BOOST_PP_SLOT_4_DIGIT_8 8
+# elif BOOST_PP_SLOT_TEMP_8 == 9
+#    define BOOST_PP_SLOT_4_DIGIT_8 9
+# endif
+#
+# if BOOST_PP_SLOT_TEMP_7 == 0
+#    define BOOST_PP_SLOT_4_DIGIT_7 0
+# elif BOOST_PP_SLOT_TEMP_7 == 1
+#    define BOOST_PP_SLOT_4_DIGIT_7 1
+# elif BOOST_PP_SLOT_TEMP_7 == 2
+#    define BOOST_PP_SLOT_4_DIGIT_7 2
+# elif BOOST_PP_SLOT_TEMP_7 == 3
+#    define BOOST_PP_SLOT_4_DIGIT_7 3
+# elif BOOST_PP_SLOT_TEMP_7 == 4
+#    define BOOST_PP_SLOT_4_DIGIT_7 4
+# elif BOOST_PP_SLOT_TEMP_7 == 5
+#    define BOOST_PP_SLOT_4_DIGIT_7 5
+# elif BOOST_PP_SLOT_TEMP_7 == 6
+#    define BOOST_PP_SLOT_4_DIGIT_7 6
+# elif BOOST_PP_SLOT_TEMP_7 == 7
+#    define BOOST_PP_SLOT_4_DIGIT_7 7
+# elif BOOST_PP_SLOT_TEMP_7 == 8
+#    define BOOST_PP_SLOT_4_DIGIT_7 8
+# elif BOOST_PP_SLOT_TEMP_7 == 9
+#    define BOOST_PP_SLOT_4_DIGIT_7 9
+# endif
+#
+# if BOOST_PP_SLOT_TEMP_6 == 0
+#    define BOOST_PP_SLOT_4_DIGIT_6 0
+# elif BOOST_PP_SLOT_TEMP_6 == 1
+#    define BOOST_PP_SLOT_4_DIGIT_6 1
+# elif BOOST_PP_SLOT_TEMP_6 == 2
+#    define BOOST_PP_SLOT_4_DIGIT_6 2
+# elif BOOST_PP_SLOT_TEMP_6 == 3
+#    define BOOST_PP_SLOT_4_DIGIT_6 3
+# elif BOOST_PP_SLOT_TEMP_6 == 4
+#    define BOOST_PP_SLOT_4_DIGIT_6 4
+# elif BOOST_PP_SLOT_TEMP_6 == 5
+#    define BOOST_PP_SLOT_4_DIGIT_6 5
+# elif BOOST_PP_SLOT_TEMP_6 == 6
+#    define BOOST_PP_SLOT_4_DIGIT_6 6
+# elif BOOST_PP_SLOT_TEMP_6 == 7
+#    define BOOST_PP_SLOT_4_DIGIT_6 7
+# elif BOOST_PP_SLOT_TEMP_6 == 8
+#    define BOOST_PP_SLOT_4_DIGIT_6 8
+# elif BOOST_PP_SLOT_TEMP_6 == 9
+#    define BOOST_PP_SLOT_4_DIGIT_6 9
+# endif
+#
+# if BOOST_PP_SLOT_TEMP_5 == 0
+#    define BOOST_PP_SLOT_4_DIGIT_5 0
+# elif BOOST_PP_SLOT_TEMP_5 == 1
+#    define BOOST_PP_SLOT_4_DIGIT_5 1
+# elif BOOST_PP_SLOT_TEMP_5 == 2
+#    define BOOST_PP_SLOT_4_DIGIT_5 2
+# elif BOOST_PP_SLOT_TEMP_5 == 3
+#    define BOOST_PP_SLOT_4_DIGIT_5 3
+# elif BOOST_PP_SLOT_TEMP_5 == 4
+#    define BOOST_PP_SLOT_4_DIGIT_5 4
+# elif BOOST_PP_SLOT_TEMP_5 == 5
+#    define BOOST_PP_SLOT_4_DIGIT_5 5
+# elif BOOST_PP_SLOT_TEMP_5 == 6
+#    define BOOST_PP_SLOT_4_DIGIT_5 6
+# elif BOOST_PP_SLOT_TEMP_5 == 7
+#    define BOOST_PP_SLOT_4_DIGIT_5 7
+# elif BOOST_PP_SLOT_TEMP_5 == 8
+#    define BOOST_PP_SLOT_4_DIGIT_5 8
+# elif BOOST_PP_SLOT_TEMP_5 == 9
+#    define BOOST_PP_SLOT_4_DIGIT_5 9
+# endif
+#
+# if BOOST_PP_SLOT_TEMP_4 == 0
+#    define BOOST_PP_SLOT_4_DIGIT_4 0
+# elif BOOST_PP_SLOT_TEMP_4 == 1
+#    define BOOST_PP_SLOT_4_DIGIT_4 1
+# elif BOOST_PP_SLOT_TEMP_4 == 2
+#    define BOOST_PP_SLOT_4_DIGIT_4 2
+# elif BOOST_PP_SLOT_TEMP_4 == 3
+#    define BOOST_PP_SLOT_4_DIGIT_4 3
+# elif BOOST_PP_SLOT_TEMP_4 == 4
+#    define BOOST_PP_SLOT_4_DIGIT_4 4
+# elif BOOST_PP_SLOT_TEMP_4 == 5
+#    define BOOST_PP_SLOT_4_DIGIT_4 5
+# elif BOOST_PP_SLOT_TEMP_4 == 6
+#    define BOOST_PP_SLOT_4_DIGIT_4 6
+# elif BOOST_PP_SLOT_TEMP_4 == 7
+#    define BOOST_PP_SLOT_4_DIGIT_4 7
+# elif BOOST_PP_SLOT_TEMP_4 == 8
+#    define BOOST_PP_SLOT_4_DIGIT_4 8
+# elif BOOST_PP_SLOT_TEMP_4 == 9
+#    define BOOST_PP_SLOT_4_DIGIT_4 9
+# endif
+#
+# if BOOST_PP_SLOT_TEMP_3 == 0
+#    define BOOST_PP_SLOT_4_DIGIT_3 0
+# elif BOOST_PP_SLOT_TEMP_3 == 1
+#    define BOOST_PP_SLOT_4_DIGIT_3 1
+# elif BOOST_PP_SLOT_TEMP_3 == 2
+#    define BOOST_PP_SLOT_4_DIGIT_3 2
+# elif BOOST_PP_SLOT_TEMP_3 == 3
+#    define BOOST_PP_SLOT_4_DIGIT_3 3
+# elif BOOST_PP_SLOT_TEMP_3 == 4
+#    define BOOST_PP_SLOT_4_DIGIT_3 4
+# elif BOOST_PP_SLOT_TEMP_3 == 5
+#    define BOOST_PP_SLOT_4_DIGIT_3 5
+# elif BOOST_PP_SLOT_TEMP_3 == 6
+#    define BOOST_PP_SLOT_4_DIGIT_3 6
+# elif BOOST_PP_SLOT_TEMP_3 == 7
+#    define BOOST_PP_SLOT_4_DIGIT_3 7
+# elif BOOST_PP_SLOT_TEMP_3 == 8
+#    define BOOST_PP_SLOT_4_DIGIT_3 8
+# elif BOOST_PP_SLOT_TEMP_3 == 9
+#    define BOOST_PP_SLOT_4_DIGIT_3 9
+# endif
+#
+# if BOOST_PP_SLOT_TEMP_2 == 0
+#    define BOOST_PP_SLOT_4_DIGIT_2 0
+# elif BOOST_PP_SLOT_TEMP_2 == 1
+#    define BOOST_PP_SLOT_4_DIGIT_2 1
+# elif BOOST_PP_SLOT_TEMP_2 == 2
+#    define BOOST_PP_SLOT_4_DIGIT_2 2
+# elif BOOST_PP_SLOT_TEMP_2 == 3
+#    define BOOST_PP_SLOT_4_DIGIT_2 3
+# elif BOOST_PP_SLOT_TEMP_2 == 4
+#    define BOOST_PP_SLOT_4_DIGIT_2 4
+# elif BOOST_PP_SLOT_TEMP_2 == 5
+#    define BOOST_PP_SLOT_4_DIGIT_2 5
+# elif BOOST_PP_SLOT_TEMP_2 == 6
+#    define BOOST_PP_SLOT_4_DIGIT_2 6
+# elif BOOST_PP_SLOT_TEMP_2 == 7
+#    define BOOST_PP_SLOT_4_DIGIT_2 7
+# elif BOOST_PP_SLOT_TEMP_2 == 8
+#    define BOOST_PP_SLOT_4_DIGIT_2 8
+# elif BOOST_PP_SLOT_TEMP_2 == 9
+#    define BOOST_PP_SLOT_4_DIGIT_2 9
+# endif
+#
+# if BOOST_PP_SLOT_TEMP_1 == 0
+#    define BOOST_PP_SLOT_4_DIGIT_1 0
+# elif BOOST_PP_SLOT_TEMP_1 == 1
+#    define BOOST_PP_SLOT_4_DIGIT_1 1
+# elif BOOST_PP_SLOT_TEMP_1 == 2
+#    define BOOST_PP_SLOT_4_DIGIT_1 2
+# elif BOOST_PP_SLOT_TEMP_1 == 3
+#    define BOOST_PP_SLOT_4_DIGIT_1 3
+# elif BOOST_PP_SLOT_TEMP_1 == 4
+#    define BOOST_PP_SLOT_4_DIGIT_1 4
+# elif BOOST_PP_SLOT_TEMP_1 == 5
+#    define BOOST_PP_SLOT_4_DIGIT_1 5
+# elif BOOST_PP_SLOT_TEMP_1 == 6
+#    define BOOST_PP_SLOT_4_DIGIT_1 6
+# elif BOOST_PP_SLOT_TEMP_1 == 7
+#    define BOOST_PP_SLOT_4_DIGIT_1 7
+# elif BOOST_PP_SLOT_TEMP_1 == 8
+#    define BOOST_PP_SLOT_4_DIGIT_1 8
+# elif BOOST_PP_SLOT_TEMP_1 == 9
+#    define BOOST_PP_SLOT_4_DIGIT_1 9
+# endif
+#
+# if BOOST_PP_SLOT_4_DIGIT_10
+#    define BOOST_PP_SLOT_4() BOOST_PP_SLOT_CC_10(BOOST_PP_SLOT_4_DIGIT_10, BOOST_PP_SLOT_4_DIGIT_9, BOOST_PP_SLOT_4_DIGIT_8, BOOST_PP_SLOT_4_DIGIT_7, BOOST_PP_SLOT_4_DIGIT_6, BOOST_PP_SLOT_4_DIGIT_5, BOOST_PP_SLOT_4_DIGIT_4, BOOST_PP_SLOT_4_DIGIT_3, BOOST_PP_SLOT_4_DIGIT_2, BOOST_PP_SLOT_4_DIGIT_1)
+# elif BOOST_PP_SLOT_4_DIGIT_9
+#    define BOOST_PP_SLOT_4() BOOST_PP_SLOT_CC_9(BOOST_PP_SLOT_4_DIGIT_9, BOOST_PP_SLOT_4_DIGIT_8, BOOST_PP_SLOT_4_DIGIT_7, BOOST_PP_SLOT_4_DIGIT_6, BOOST_PP_SLOT_4_DIGIT_5, BOOST_PP_SLOT_4_DIGIT_4, BOOST_PP_SLOT_4_DIGIT_3, BOOST_PP_SLOT_4_DIGIT_2, BOOST_PP_SLOT_4_DIGIT_1)
+# elif BOOST_PP_SLOT_4_DIGIT_8
+#    define BOOST_PP_SLOT_4() BOOST_PP_SLOT_CC_8(BOOST_PP_SLOT_4_DIGIT_8, BOOST_PP_SLOT_4_DIGIT_7, BOOST_PP_SLOT_4_DIGIT_6, BOOST_PP_SLOT_4_DIGIT_5, BOOST_PP_SLOT_4_DIGIT_4, BOOST_PP_SLOT_4_DIGIT_3, BOOST_PP_SLOT_4_DIGIT_2, BOOST_PP_SLOT_4_DIGIT_1)
+# elif BOOST_PP_SLOT_4_DIGIT_7
+#    define BOOST_PP_SLOT_4() BOOST_PP_SLOT_CC_7(BOOST_PP_SLOT_4_DIGIT_7, BOOST_PP_SLOT_4_DIGIT_6, BOOST_PP_SLOT_4_DIGIT_5, BOOST_PP_SLOT_4_DIGIT_4, BOOST_PP_SLOT_4_DIGIT_3, BOOST_PP_SLOT_4_DIGIT_2, BOOST_PP_SLOT_4_DIGIT_1)
+# elif BOOST_PP_SLOT_4_DIGIT_6
+#    define BOOST_PP_SLOT_4() BOOST_PP_SLOT_CC_6(BOOST_PP_SLOT_4_DIGIT_6, BOOST_PP_SLOT_4_DIGIT_5, BOOST_PP_SLOT_4_DIGIT_4, BOOST_PP_SLOT_4_DIGIT_3, BOOST_PP_SLOT_4_DIGIT_2, BOOST_PP_SLOT_4_DIGIT_1)
+# elif BOOST_PP_SLOT_4_DIGIT_5
+#    define BOOST_PP_SLOT_4() BOOST_PP_SLOT_CC_5(BOOST_PP_SLOT_4_DIGIT_5, BOOST_PP_SLOT_4_DIGIT_4, BOOST_PP_SLOT_4_DIGIT_3, BOOST_PP_SLOT_4_DIGIT_2, BOOST_PP_SLOT_4_DIGIT_1)
+# elif BOOST_PP_SLOT_4_DIGIT_4
+#    define BOOST_PP_SLOT_4() BOOST_PP_SLOT_CC_4(BOOST_PP_SLOT_4_DIGIT_4, BOOST_PP_SLOT_4_DIGIT_3, BOOST_PP_SLOT_4_DIGIT_2, BOOST_PP_SLOT_4_DIGIT_1)
+# elif BOOST_PP_SLOT_4_DIGIT_3
+#    define BOOST_PP_SLOT_4() BOOST_PP_SLOT_CC_3(BOOST_PP_SLOT_4_DIGIT_3, BOOST_PP_SLOT_4_DIGIT_2, BOOST_PP_SLOT_4_DIGIT_1)
+# elif BOOST_PP_SLOT_4_DIGIT_2
+#    define BOOST_PP_SLOT_4() BOOST_PP_SLOT_CC_2(BOOST_PP_SLOT_4_DIGIT_2, BOOST_PP_SLOT_4_DIGIT_1)
+# else
+#    define BOOST_PP_SLOT_4() BOOST_PP_SLOT_4_DIGIT_1
+# endif