From 2f9be1086a59447904b672cc5b76a0b80033d833 Mon Sep 17 00:00:00 2001
From: Edward Diener <eldlistmailingz@tropicsoft.com>
Date: Thu, 26 Sep 2019 16:07:03 -0400
Subject: [PATCH] Less wasteful inclusion.

---
 include/boost/preprocessor/facilities/is_empty_variadic.hpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/boost/preprocessor/facilities/is_empty_variadic.hpp b/include/boost/preprocessor/facilities/is_empty_variadic.hpp
index 1c1e3d1..f194a3f 100644
--- a/include/boost/preprocessor/facilities/is_empty_variadic.hpp
+++ b/include/boost/preprocessor/facilities/is_empty_variadic.hpp
@@ -64,7 +64,7 @@
     (__VA_ARGS__) \
 /**/
 #define BOOST_PP_IS_EMPTY_ZERO(...) 0
-#if BOOST_PP_VARIADIC_OPT()
+# if defined(__cplusplus) && __cplusplus > 201703L
 #define BOOST_PP_IS_EMPTY_FUNCTION2(...) \
     __VA_OPT__(0,) 1 \
 /**/