[bugfix] method directionalSubDiff must be const

766a697e · Oliver Sander · ceadb798 · 766a697e
Commit 766a697e authored Jun 08, 2015 by Oliver Sander
--- a/dune/tnnmg/functionals/normfunctional.hh
+++ b/dune/tnnmg/functionals/normfunctional.hh
@@ -106,7 +106,7 @@ namespace Dune {
       * \param u base point
       * \param v direction
       */
-      virtual void directionalSubDiff(const VectorType& u, const VectorType& v, Dune::Solvers::Interval<double>& subdifferential)
+      virtual void directionalSubDiff(const VectorType& u, const VectorType& v, Dune::Solvers::Interval<double>& subdifferential) const
      {
        subdifferential[0] = 0.0;
        subdifferential[1] = 0.0;