Use std::enable_if<condition, int>::type =0

dune/common/densevector.hh

@@ -603,10 +603,9 @@ namespace Dune {
     }
 
     //! infinity norm (maximum of absolute values of entries)
-    template <typename vt = value_type>
-    typename std::enable_if<!has_nan<vt>::value,
-                            typename FieldTraits<vt>::real_type>::type
-    infinity_norm() const {
+    template <typename vt = value_type,
+              typename std::enable_if<!has_nan<vt>::value, int>::type = 0>
+    typename FieldTraits<vt>::real_type infinity_norm() const {
       using real_type = typename FieldTraits<vt>::real_type;
       using std::abs;
       using std::max;
@@ -620,10 +619,9 @@ namespace Dune {
     }
 
     //! simplified infinity norm (uses Manhattan norm for complex values)
-    template <typename vt = value_type>
-    typename std::enable_if<!has_nan<vt>::value,
-                            typename FieldTraits<vt>::real_type>::type
-    infinity_norm_real() const {
+    template <typename vt = value_type,
+              typename std::enable_if<!has_nan<vt>::value, int>::type = 0>
+    typename FieldTraits<vt>::real_type infinity_norm_real() const {
       using real_type = typename FieldTraits<vt>::real_type;
       using std::max;
 
@@ -636,10 +634,9 @@ namespace Dune {
     }
 
     //! infinity norm (maximum of absolute values of entries)
-    template <typename vt = value_type>
-    typename std::enable_if<has_nan<vt>::value,
-                            typename FieldTraits<vt>::real_type>::type
-    infinity_norm() const {
+    template <typename vt = value_type,
+              typename std::enable_if<has_nan<vt>::value, int>::type = 0>
+    typename FieldTraits<vt>::real_type infinity_norm() const {
       using real_type = typename FieldTraits<vt>::real_type;
       using std::abs;
       using std::max;
@@ -656,10 +653,9 @@ namespace Dune {
     }
 
     //! simplified infinity norm (uses Manhattan norm for complex values)
-    template <typename vt = value_type>
-    typename std::enable_if<has_nan<vt>::value,
-                            typename FieldTraits<vt>::real_type>::type
-    infinity_norm_real() const {
+    template <typename vt = value_type,
+              typename std::enable_if<has_nan<vt>::value, int>::type = 0>
+    typename FieldTraits<vt>::real_type infinity_norm_real() const {
       using real_type = typename FieldTraits<vt>::real_type;
       using std::max;
 

dune/common/typetraits.hh

@@ -527,7 +527,6 @@ namespace Dune
     static_assert(std::is_same<I,std::size_t>::value,"Your compiler is broken and does not support checking for arbitrary index types");
   };
 
-
 #endif // defined(DOXYGEN) or HAVE_IS_INDEXABLE_SUPPORT