Use constexpr instead of DUNE_CONSTEXPR

dune/common/std/utility.hh

@@ -6,7 +6,6 @@
 #include <type_traits>
 #include <utility>
 
-#include <dune/common/std/constexpr.hh>
 #include <dune/common/std/noexcept.hh>
 
 namespace Dune
@@ -44,7 +43,7 @@ namespace Dune
       typedef T value_type;
 
       /** \brief return number of elements in sequence */
-      static DUNE_CONSTEXPR std::size_t size () { return sizeof...( Ints ); }
+      static constexpr std::size_t size () { return sizeof...( Ints ); }
     };
 
 
@@ -126,7 +125,7 @@ namespace Dune
      *  \tparam  N  requested size of index sequence
      */
     template< std::size_t N >
-    static DUNE_CONSTEXPR inline typename make_index_sequence_impl< N >::type make_index_sequence ()
+    static constexpr inline typename make_index_sequence_impl< N >::type make_index_sequence ()
     {
       return typename make_index_sequence_impl< N >::type();
     }
@@ -145,7 +144,7 @@ namespace Dune
      *  \tparam  N  requested size of integer sequence
      */
     template< class T, T N >
-    static DUNE_CONSTEXPR inline typename make_index_sequence_impl< N >::type::template rebind< T >::type
+    static constexpr inline typename make_index_sequence_impl< N >::type::template rebind< T >::type
     make_integer_sequence ()
     {
       return typename make_index_sequence_impl< N >::type::template rebind< T >::type();
@@ -164,7 +163,7 @@ namespace Dune
      *  \tparam  ...T  a type parameter pack
      */
     template< class... T >
-    static DUNE_CONSTEXPR inline typename make_index_sequence_impl< sizeof...( T ) >::type
+    static constexpr inline typename make_index_sequence_impl< sizeof...( T ) >::type
     index_sequence_for ()
     {
       return typename make_index_sequence_impl< sizeof...( T ) >::type();