From c891c8e2051613e74a90ff67cea9f4c63ac8e98e Mon Sep 17 00:00:00 2001
From: Peter Dimov <pdimov@pdimov.com>
Date: Thu, 1 Jun 2017 17:27:17 +0300
Subject: [PATCH] Do not include boost/mp11.hpp if already included, to allow
 use on Compiler Explorer

---
 include/boost/variant2/variant.hpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/boost/variant2/variant.hpp b/include/boost/variant2/variant.hpp
index 4ce586e..f262f0e 100644
--- a/include/boost/variant2/variant.hpp
+++ b/include/boost/variant2/variant.hpp
@@ -8,7 +8,9 @@
 //  See accompanying file LICENSE_1_0.txt or copy at
 //  http://www.boost.org/LICENSE_1_0.txt
 
+#ifndef BOOST_MP11_HPP_INCLUDED
 #include <boost/mp11.hpp>
+#endif
 #include <boost/config.hpp>
 #include <boost/detail/workaround.hpp>
 #include <cstddef>