From db212400607006217c1ea3fc644155e708195fc3 Mon Sep 17 00:00:00 2001
From: Edward Diener <eldlistmailingz@tropicsoft.com>
Date: Sun, 5 Jul 2020 13:13:06 -0400
Subject: [PATCH] Split reverse for seq seize greater than 256

---
 include/boost/preprocessor/seq/reverse.hpp | 45 +++++++++++++++-------
 1 file changed, 31 insertions(+), 14 deletions(-)

diff --git a/include/boost/preprocessor/seq/reverse.hpp b/include/boost/preprocessor/seq/reverse.hpp
index 13c5ff1..be30ba3 100644
--- a/include/boost/preprocessor/seq/reverse.hpp
+++ b/include/boost/preprocessor/seq/reverse.hpp
@@ -22,19 +22,28 @@
 # include <boost/preprocessor/seq/rest_n.hpp>
 # include <boost/preprocessor/seq/fold_left.hpp>
 # include <boost/preprocessor/seq/size.hpp>
+# include <boost/preprocessor/config/limits.hpp>
 #
 # /* BOOST_PP_SEQ_REVERSE */
 #
 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
-#    define BOOST_PP_SEQ_REVERSE(seq) BOOST_PP_SEQ_REVERSE_HALVES(BOOST_PP_DIV(BOOST_PP_SEQ_SIZE(seq),2),seq)
-#    define BOOST_PP_SEQ_REVERSE_HALVES(half,seq) \
-            BOOST_PP_IF(half,BOOST_PP_SEQ_REVERSE_NAMT,BOOST_PP_IDENTITY_N(seq,2))(half,seq)
-#    define BOOST_PP_SEQ_REVERSE_NAMT(half,seq) \
-            BOOST_PP_SEQ_DO_REVERSE(BOOST_PP_SEQ_REST_N(half,seq)) BOOST_PP_SEQ_DO_REVERSE(BOOST_PP_SEQ_FIRST_N(half,seq))
-#    define BOOST_PP_SEQ_DO_REVERSE(seq) BOOST_PP_SEQ_FOLD_LEFT(BOOST_PP_SEQ_REVERSE_O, BOOST_PP_EMPTY, seq)()
+#    if BOOST_PP_LIMIT_SEQ == 256
+#       define BOOST_PP_SEQ_REVERSE(seq) BOOST_PP_SEQ_FOLD_LEFT(BOOST_PP_SEQ_REVERSE_O, BOOST_PP_EMPTY, seq)()
+#    else
+#       define BOOST_PP_SEQ_REVERSE(seq) BOOST_PP_SEQ_REVERSE_HALVES(BOOST_PP_DIV(BOOST_PP_SEQ_SIZE(seq),2),seq)
+#       define BOOST_PP_SEQ_REVERSE_HALVES(half,seq) \
+                BOOST_PP_IF(half,BOOST_PP_SEQ_REVERSE_NAMT,BOOST_PP_IDENTITY_N(seq,2))(half,seq)
+#       define BOOST_PP_SEQ_REVERSE_NAMT(half,seq) \
+                BOOST_PP_SEQ_DO_REVERSE(BOOST_PP_SEQ_REST_N(half,seq)) BOOST_PP_SEQ_DO_REVERSE(BOOST_PP_SEQ_FIRST_N(half,seq))
+#       define BOOST_PP_SEQ_DO_REVERSE(seq) BOOST_PP_SEQ_FOLD_LEFT(BOOST_PP_SEQ_REVERSE_O, BOOST_PP_EMPTY, seq)()
+#    endif
 # else
 #    define BOOST_PP_SEQ_REVERSE(seq) BOOST_PP_SEQ_REVERSE_I(seq)
-#    define BOOST_PP_SEQ_REVERSE_I(seq) BOOST_PP_SEQ_REVERSE_HALVES(BOOST_PP_DIV(BOOST_PP_SEQ_SIZE(seq),2),seq)
+#    if BOOST_PP_LIMIT_SEQ == 256
+#       define BOOST_PP_SEQ_REVERSE_I(seq) BOOST_PP_SEQ_FOLD_LEFT(BOOST_PP_SEQ_REVERSE_O, BOOST_PP_EMPTY, seq)()
+#    else
+#       define BOOST_PP_SEQ_REVERSE_I(seq) BOOST_PP_SEQ_REVERSE_HALVES(BOOST_PP_DIV(BOOST_PP_SEQ_SIZE(seq),2),seq)
+#    endif
 # endif
 #
 # define BOOST_PP_SEQ_REVERSE_O(s, state, elem) (elem) state
@@ -42,15 +51,23 @@
 # /* BOOST_PP_SEQ_REVERSE_S */
 #
 # if ~BOOST_PP_CONFIG_FLAGS() & BOOST_PP_CONFIG_EDG()
-#    define BOOST_PP_SEQ_REVERSE_S(s, seq) BOOST_PP_SEQ_REVERSE_HALVES_S(s,BOOST_PP_DIV(BOOST_PP_SEQ_SIZE(seq),2),seq)
-#    define BOOST_PP_SEQ_REVERSE_HALVES_S(s,half,seq) \
-            BOOST_PP_IF(half,BOOST_PP_SEQ_REVERSE_NAMT_S,BOOST_PP_IDENTITY_N(seq,3))(s,half,seq)
-#    define BOOST_PP_SEQ_REVERSE_NAMT_S(s,half,seq) \
-            BOOST_PP_SEQ_DO_REVERSE_S(s,BOOST_PP_SEQ_REST_N(half,seq)) BOOST_PP_SEQ_DO_REVERSE_S(s,BOOST_PP_SEQ_FIRST_N(half,seq))
-#    define BOOST_PP_SEQ_DO_REVERSE_S(s, seq) BOOST_PP_SEQ_FOLD_LEFT_ ## s(BOOST_PP_SEQ_REVERSE_O, BOOST_PP_EMPTY, seq)()
+#    if BOOST_PP_LIMIT_SEQ == 256
+#       define BOOST_PP_SEQ_REVERSE_S(s, seq) BOOST_PP_SEQ_FOLD_LEFT_ ## s(BOOST_PP_SEQ_REVERSE_O, BOOST_PP_EMPTY, seq)()
+#    else
+#       define BOOST_PP_SEQ_REVERSE_S(s, seq) BOOST_PP_SEQ_REVERSE_HALVES_S(s,BOOST_PP_DIV(BOOST_PP_SEQ_SIZE(seq),2),seq)
+#       define BOOST_PP_SEQ_REVERSE_HALVES_S(s,half,seq) \
+               BOOST_PP_IF(half,BOOST_PP_SEQ_REVERSE_NAMT_S,BOOST_PP_IDENTITY_N(seq,3))(s,half,seq)
+#       define BOOST_PP_SEQ_REVERSE_NAMT_S(s,half,seq) \
+               BOOST_PP_SEQ_DO_REVERSE_S(s,BOOST_PP_SEQ_REST_N(half,seq)) BOOST_PP_SEQ_DO_REVERSE_S(s,BOOST_PP_SEQ_FIRST_N(half,seq))
+#       define BOOST_PP_SEQ_DO_REVERSE_S(s, seq) BOOST_PP_SEQ_FOLD_LEFT_ ## s(BOOST_PP_SEQ_REVERSE_O, BOOST_PP_EMPTY, seq)()
+#    endif
 # else
 #    define BOOST_PP_SEQ_REVERSE_S(s, seq) BOOST_PP_SEQ_REVERSE_S_I(s, seq)
-#    define BOOST_PP_SEQ_REVERSE_S_I(s, seq) BOOST_PP_SEQ_REVERSE_HALVES_S(s,BOOST_PP_DIV(BOOST_PP_SEQ_SIZE(seq),2),seq)
+#    if BOOST_PP_LIMIT_SEQ == 256
+#       define BOOST_PP_SEQ_REVERSE_S_I(s, seq) BOOST_PP_SEQ_FOLD_LEFT_ ## s(BOOST_PP_SEQ_REVERSE_O, BOOST_PP_EMPTY, seq)()
+#    else
+#       define BOOST_PP_SEQ_REVERSE_S_I(s, seq) BOOST_PP_SEQ_REVERSE_HALVES_S(s,BOOST_PP_DIV(BOOST_PP_SEQ_SIZE(seq),2),seq)
+#    endif
 # endif
 #
 # endif