Import 'restrict' method for bit fields from the base class

dune/solvers/transferoperators/truncatedcompressedmgtransfer.hh

@@ -45,6 +45,9 @@ public:
     /** \brief Default constructor */
     using Base::Base;
 
+    /** \brief Import method for restricting bit fields */
+    using Base::restrict;
+
     /** \brief Restrict level fL of f and store the result in level cL of t */
     void restrict(const VectorType& f, VectorType &t) const override;