[grid.boundaryinfo.normalbased] fix compilation failure, add global instances

dune/xt/grid/boundaryinfo/normalbased.hh

@@ -163,13 +163,13 @@ public:
       if (XT::Common::FloatCmp::eq(existing_normal, normalized_normal, tol_))
         DUNE_THROW(InvalidStateException, "Given normals are too close for given tolerance '" << tol_ << "'!");
     }
-    normal_to_type_map_.emplace(normal, std::move(boundary_type));
+    normal_to_type_map_.emplace(normal, std::shared_ptr<BoundaryType>(std::move(boundary_type)));
   } // ... void register_new_normal(...)
 
   const BoundaryType& type(const IntersectionType& intersection) const override final
   {
     if (!intersection.boundary())
-      return no_boundary_;
+      return no_boundary;
     const WorldType outer_normal = intersection.centerUnitOuterNormal();
     for (const auto& normal_and_type_pair : normal_to_type_map_) {
       const auto& normal = normal_and_type_pair.first;
@@ -183,7 +183,6 @@ public:
 private:
   const DomainFieldType tol_;
   const std::unique_ptr<BoundaryType> default_boundary_type_;
-  const NoBoundary no_boundary_;
   std::unordered_map<WorldType, std::shared_ptr<BoundaryType>> normal_to_type_map_;
 }; // class NormalBasedBoundaryInfo
 #if (defined(BOOST_CLANG) && BOOST_CLANG) || (defined(BOOST_GCC) && BOOST_GCC)

dune/xt/grid/boundaryinfo/types.hh

@@ -196,7 +196,7 @@ public:
 #endif
 
 
-static BoundaryType* make_boundary_type(const std::string& id)
+static inline BoundaryType* make_boundary_type(const std::string& id)
 {
   if (id == NoBoundary().id())
     return new NoBoundary();
@@ -227,6 +227,12 @@ static BoundaryType* make_boundary_type(const std::string& id)
 } // ... make_boundary_type(...)
 
 
+static constexpr AbsorbingBoundary absorbing_boundary{};
+static constexpr DirichletBoundary dirichlet_boundary{};
+static constexpr NoBoundary no_boundary{};
+static constexpr ReflectingBoundary reflecting_boundary{};
+
+
 } // namespace Grid
 } // namespace XT
 } // namespace Dune