decltype bug in DOFVectorView corrected

src/amdis/gridfunctions/DOFVectorView.inc.hpp

@@ -17,9 +17,6 @@ LocalFunction::operator()(LocalDomain const& x) const
   {
     using Node = std::decay_t<decltype(node)>;
     using LocalBasisRange = typename LocalFunction::template LocalBasisRange<Node>;
-    using MultiIndex = typename LocalIndexSet::MultiIndex;
-    using CoefficientBlock = typename std::decay<decltype(std::declval<Vector>()[std::declval<MultiIndex>()])>::type;
-    using RangeBlock = std::decay_t<decltype(std::declval<NodeToRangeEntry>()(node, y))>;
 
     auto&& fe = node.finiteElement();
     auto&& localBasis = fe.localBasis();
@@ -29,12 +26,14 @@ LocalFunction::operator()(LocalDomain const& x) const
 
     // Get range entry associated to this node
     auto&& re = nodeToRangeEntry(node, y);
+    using RangeBlock = std::decay_t<decltype(re)>;
 
     for (std::size_t i = 0; i < localBasis.size(); ++i) {
       auto&& multiIndex = localIndexSet_.index(node.localIndex(i));
 
       // Get coefficient associated to i-th shape function
       auto&& c = coefficients[multiIndex];
+      using CoefficientBlock = std::decay_t<decltype(c)>;
 
       // Get value of i-th shape function
       auto&& v = shapeFunctionValues[i];
@@ -74,9 +73,6 @@ GradientLocalFunction::operator()(LocalDomain const& x) const
     // TODO: may DOFVectorView::Range to FieldVector type if necessary
     using LocalDerivativeTraits = Dune::Functions::DefaultDerivativeTraits<Dune::FieldVector<double,1>(Domain)>;
     using GradientBlock = typename LocalDerivativeTraits::Range;
-    using MultiIndex = typename LocalIndexSet::MultiIndex;
-    using CoefficientBlock = typename std::decay<decltype(std::declval<Vector>()[std::declval<MultiIndex>()])>::type;
-    using RangeBlock = std::decay_t<decltype(std::declval<NodeToRangeEntry>()(node, dy))>;
 
     auto&& fe = node.finiteElement();
     auto&& localBasis = fe.localBasis();
@@ -94,12 +90,14 @@ GradientLocalFunction::operator()(LocalDomain const& x) const
 
     // Get range entry associated to this node
     auto&& re = nodeToRangeEntry(node, dy);
+    using RangeBlock = std::decay_t<decltype(re)>;
 
     for (std::size_t i = 0; i < localBasis.size(); ++i) {
       auto&& multiIndex = localIndexSet_.index(node.localIndex(i));
 
       // Get coefficient associated to i-th shape function
       auto&& c = coefficients[multiIndex];
+      using CoefficientBlock = std::decay_t<decltype(c)>;
 
       // Get value of i-th transformed reference gradient
       auto&& grad = gradients[i];