From 4fe7807f79a3cb2f4d3b93d167c3619c882552cf Mon Sep 17 00:00:00 2001
From: Edward Diener <eldlistmailingz@tropicsoft.com>
Date: Sun, 20 Oct 2019 17:00:51 -0400
Subject: [PATCH] Add BOOST_PP_VA_OPT implementation

---
 .../boost/preprocessor/facilities/va_opt.hpp  | 29 +++++++++++++++++++
 1 file changed, 29 insertions(+)
 create mode 100644 include/boost/preprocessor/facilities/va_opt.hpp

diff --git a/include/boost/preprocessor/facilities/va_opt.hpp b/include/boost/preprocessor/facilities/va_opt.hpp
new file mode 100644
index 0000000..bb25f1b
--- /dev/null
+++ b/include/boost/preprocessor/facilities/va_opt.hpp
@@ -0,0 +1,29 @@
+# /* **************************************************************************
+#  *                                                                          *
+#  *     (C) Copyright Edward Diener 2019.
+#  *     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. */
+#
+# ifndef BOOST_PREPROCESSOR_FACILITIES_VA_OPT_HPP
+# define BOOST_PREPROCESSOR_FACILITIES_VA_OPT_HPP
+# include <boost/preprocessor/variadic/has_opt.hpp>
+# if BOOST_PP_VARIADIC_HAS_OPT()
+# include <boost/preprocessor/control/iif.hpp>
+# include <boost/preprocessor/facilities/check_empty.hpp>
+# include <boost/preprocessor/tuple/rem.hpp>
+# define BOOST_PP_VA_OPT(rdata,rempty,...) \
+    BOOST_PP_TUPLE_REM() \
+    BOOST_PP_IIF \
+        ( \
+        BOOST_PP_CHECK_EMPTY(__VA_ARGS__), \
+        rempty, \
+        rdata \
+        } \
+/**?
+# endif /* BOOST_PP_VARIADIC_HAS_OPT() */
+# endif /* BOOST_PREPROCESSOR_FACILITIES_VA_OPT_HPP */