Use base class constructors to add construction from given maxtrix

dune/solvers/transferoperators/truncatedcompressedmgtransfer.hh

@@ -41,11 +41,9 @@ class TruncatedCompressedMGTransfer :
 public:
 
     typedef typename Base::TransferOperatorType TransferOperatorType;
-    
 
     /** \brief Default constructor */
-    TruncatedCompressedMGTransfer()
-    {}
+    using Base::Base;
 
     /** \brief Restrict level fL of f and store the result in level cL of t */
     void restrict(const VectorType& f, VectorType &t) const;