From 1305001a58b2dd3a7395cd4baf5b0fbb5cc89961 Mon Sep 17 00:00:00 2001
From: jzmaddock <john@johnmaddock.co.uk>
Date: Mon, 7 May 2018 18:49:53 +0100
Subject: [PATCH] Trivial fix for GCCXML, fixes:
 https://github.com/boostorg/type_traits/issues/69

---
 include/boost/type_traits/detail/common_arithmetic_type.hpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/include/boost/type_traits/detail/common_arithmetic_type.hpp b/include/boost/type_traits/detail/common_arithmetic_type.hpp
index a7aff03..92c16da 100644
--- a/include/boost/type_traits/detail/common_arithmetic_type.hpp
+++ b/include/boost/type_traits/detail/common_arithmetic_type.hpp
@@ -206,9 +206,11 @@ private:
 
     static bool cond();
 
+    BOOST_STATIC_CONSTANT(const int, selector = sizeof(select(cond() ? T() : U())));
+
 public:
 
-    typedef typename arithmetic_type< sizeof(select( cond()? T(): U() )) >::type type;
+    typedef typename arithmetic_type<selector>::type type;
 };
 
 } // namespace type_traits_detail