From de0e18ca0a2bd10d54c7fc0e99adbaab98ce657f Mon Sep 17 00:00:00 2001
From: Eric Niebler <eniebler@boost.org>
Date: Wed, 23 Apr 2014 15:54:27 -0700
Subject: [PATCH] work around nvcc bug by only defining has_result when it's
 needed

---
 include/boost/utility/result_of.hpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/boost/utility/result_of.hpp b/include/boost/utility/result_of.hpp
index 9ea151d..206ae30 100644
--- a/include/boost/utility/result_of.hpp
+++ b/include/boost/utility/result_of.hpp
@@ -73,7 +73,10 @@ namespace detail {
 
 BOOST_MPL_HAS_XXX_TRAIT_DEF(result_type)
 
+// Work around a nvcc bug by only defining has_result when it's needed.
+#ifdef BOOST_RESULT_OF_USE_TR1_WITH_DECLTYPE_FALLBACK
 BOOST_MPL_HAS_XXX_TEMPLATE_DEF(result)
+#endif
 
 template<typename F, typename FArgs, bool HasResultType> struct tr1_result_of_impl;