[!80] [TreePath] remove last bits of deprecated TreePath

Merge branch 'remove-last-traces-of-treepath' into 'master'

ref:staging/dune-typetree\> we remove specializations of TreePath, as this now
only an alias and this the HybridTreePath version matches.

See merge request [!80]

  [!80]: gitlab.dune-project.org/staging/dune-typetree/merge_requests/80

dune/typetree/childextraction.hh

@@ -142,46 +142,6 @@ namespace Dune {
       return Impl::childStorageImpl(&node,indices...);
     }
 
-    //! Extracts the child of a node given by a static TreePath object.
-    /**
-     * Use this function to extract a (possibly indirect) child of a TypeTree node.
-     *
-     * Example:
-     *
-     * \code{.cc}
-     * Dune::TypeTree::TreePath<4,2,0,1> tp;
-     * auto&& c = child(node,tp);
-     * \endcode
-     *
-     * returns the second child of the first child of the third child
-     * of the fifth child of node.
-     *
-     * \param node        The node from which to extract the child.
-     * \param treePath    A TreePath object that describes the path into the tree to the
-     *                    wanted child.
-     * \return            A reference to the child, its cv-qualification depends on the passed-in node.
-     */
-    template<typename Node, std::size_t... Indices>
-#ifdef DOXYGEN
-    ImplementationDefined child (Node&& node, TreePath<Indices...> treePath)
-#else
-    decltype(auto) child (Node&& node, TreePath<Indices...>)
-#endif
-    {
-      return Impl::childImpl(std::forward<Node>(node),index_constant<Indices>{}...);
-    }
-
-    template<typename Node, std::size_t... Indices>
-#ifdef DOXYGEN
-    ImplementationDefined childStorage (Node&& node, TreePath<Indices...> treePath)
-#else
-    auto childStorage (Node&& node, TreePath<Indices...>)
-#endif
-    {
-      static_assert(sizeof...(Indices) > 0, "childStorage() cannot be called with an empty TreePath");
-      return Impl::childStorageImpl(&node,index_constant<Indices>{}...);
-    }
-
     //! Extracts the child of a node given by a HybridTreePath object.
     /**
      * Use this function to extract a (possibly indirect) child of a TypeTree node.

dune/typetree/typetraits.hh

@@ -164,14 +164,6 @@ namespace Dune {
         return std::false_type();
       }
 
-      // Overload for instances of TreePath<...>
-      template<std::size_t... i>
-      constexpr auto isTreePath(const TreePath<i...>*)
-        -> std::true_type
-      {
-        return std::true_type();
-      }
-
       // Overload for instances of HybridTreePath<...>
       template<class... I>
       constexpr auto isTreePath(const HybridTreePath<I...>*)