Fixed bug in heat demo.

demo/src/heat.cc

@@ -206,9 +206,7 @@ int main(int argc, char** argv)
   G *boundaryFct = new G;
   boundaryFct->setTimePtr(heat.getTime());
   heat.setExactSolution(boundaryFct);
-  DOFVector<double> G_dof(heatSpace.getFeSpace(), "G");
-  G_dof.interpol(boundaryFct);
-  heatSpace.addDirichletBC(1, 0, 0, &G_dof);
+  heatSpace.addDirichletBC(1, 0, 0, boundaryFct);
 
 
   // ===== start adaption loop =====