Fix issue 11140

include/boost/fusion/tuple/detail/tuple.hpp

@@ -52,7 +52,7 @@ namespace boost { namespace fusion
             : base_type() {}
 
         BOOST_FUSION_GPU_ENABLED tuple(tuple const& rhs)
-            : base_type(rhs) {}
+            : base_type(static_cast<base_type const&>(rhs)) {}
 
         template <typename U1, typename U2>
         BOOST_FUSION_GPU_ENABLED
@@ -72,7 +72,7 @@ namespace boost { namespace fusion
         BOOST_FUSION_GPU_ENABLED
         tuple& operator=(tuple const& rhs)
         {
-            base_type::operator=(rhs);
+            base_type::operator=(static_cast<base_type const&>(rhs));
             return *this;
         }