Merge branch 'master' of http://git.dune-project.org/repositories/dune-common

dune/common/fmatrix.hh

@@ -315,7 +315,7 @@ namespace Dune
 
     //===== conversion operator
 
-    operator K () const { return _data[0]; }
+    operator const K& () const { return _data[0]; }
 
   };
 

dune/common/fvector.hh

@@ -269,10 +269,10 @@ namespace Dune {
     //===== conversion operator
 
     /** \brief Conversion operator */
-    operator K () { return _data; }
+    operator K& () { return _data; }
 
     /** \brief Const conversion operator */
-    operator K () const { return _data; }
+    operator const K& () const { return _data; }
   };
 
   /* ----- FV / FV ----- */