Make Dune::Solvers::TupleVector an alias for Dune::TupleVector

This brings us std::tuple_element for Dune::Solvers::TupleVector.

dune/solvers/common/tuplevector.hh

@@ -3,10 +3,9 @@
 #ifndef DUNE_SOLVERS_COMMON_TUPLEVECTOR_HH
 #define DUNE_SOLVERS_COMMON_TUPLEVECTOR_HH
 
-#include <tuple>
 #warning This file is deprecated!  Use tuplevector.hh from the dune-common module instead!
 
-#include <dune/common/indices.hh>
+#include <dune/common/tuplevector.hh>
 
 namespace Dune
 {
@@ -17,38 +16,7 @@ namespace Solvers
    * \brief A std::tuple that allows access to its element via operator[]
    */
   template<class... T>
-  class TupleVector : public std::tuple<T...>
-  {
-    using Base = std::tuple<T...>;
-
-  public:
-
-    // inherit all constructors from std::tuple
-    using Base::Base;
-
-    /** \brief Const access to the tuple elements */
-    template<std::size_t i>
-    auto operator[](const Dune::index_constant<i>&) const
-      ->decltype(std::get<i>(*this))
-    {
-      return std::get<i>(*this);
-    }
-
-    /** \brief Non-const access to the tuple elements */
-    template<std::size_t i>
-    auto operator[](const Dune::index_constant<i>&)
-      ->decltype(std::get<i>(*this))
-    {
-      return std::get<i>(*this);
-    }
-
-    /** \brief Number of elements of the tuple */
-    static constexpr std::size_t size()
-    {
-      return std::tuple_size<Base>::value;
-    }
-
-  };
+  using TupleVector = Dune::TupleVector<T...>;
 
 }  // namespace Functions