The dereference method has to return a const entity reference.

edd44d16 · Timo Koch · b895b8be · edd44d16
Commit edd44d16 authored 9 years ago by Timo Koch
--- a/dune/foamgrid/foamgrid/foamgridentitypointer.hh
+++ b/dune/foamgrid/foamgrid/foamgridentitypointer.hh
@@ -53,7 +53,7 @@ class FoamGridEntityPointer


        //! dereferencing
-        Entity& dereference() const {
+        const Entity& dereference() const {
            return virtualEntity_;
        }