removed some warnings

dune/multimesh/mmiteratorbase.hh

@@ -175,7 +175,7 @@ namespace Dune
     {
       std::size_t size = entityStacks_[i].size();
       return std::accumulate(entityStacks_.begin(), entityStacks_.end(), true,
-        [i,size](bool allowed, auto const& entityStack) {
+        [size](bool allowed, auto const& entityStack) {
           return allowed && (entityStack.size() <= size || entityStack.finished(size));
         });
     }

src/benchmark.cc

@@ -38,9 +38,12 @@ template <class Grid>
 std::size_t traverse(Grid const& grid)
 {
   std::size_t num = 0;
+  double vol = 0.0;
   for (auto const& entities : elements(grid.leafGridView())) {
     ++num;
+    vol += entities.geometry().volume();
   }
+  std::cout << "volume = " << vol << "\n";
   return num;
 }