Simply code a bit using a range-based for loop

dune/fufem/functiontools/basisinterpolator.hh

@@ -115,10 +115,8 @@ struct BasisInterpolator
     template <class BitVectorType>
     static void interpolate(const B& basis, RepresentationType& coeff, const F& f, const BitVectorType& interpolateDOFFlags)
     {
-        typedef typename GridView::template Codim<0>::Iterator ElementIterator;
         typedef typename B::LocalFiniteElement LocalFiniteElement;
-
-        typedef typename Dune::LocalFiniteElementFunctionBase<typename B::LocalFiniteElement>::type FunctionBaseClass;
+        typedef typename Dune::LocalFiniteElementFunctionBase<LocalFiniteElement>::type FunctionBaseClass;
         typedef LocalFunctionComponentWrapper<F, Grid, FunctionBaseClass> LocalWrapper;
 
         const GridView& gridview = basis.getGridView();
@@ -143,11 +141,8 @@ struct BasisInterpolator
 
         std::vector<typename LocalWrapper::RangeType> interpolationValues;
 
-        ElementIterator it = gridview.template begin<0>();
-        ElementIterator end = gridview.template end<0>();
-        for(; it != end; ++it)
+        for(const auto& element : elements(gridview))
         {
-            auto&& element = *it;
             const LocalFiniteElement& fe = basis.getLocalFiniteElement(element);
 
             // check if all components have already been processed