Merge branch 'feature/runtime_order_grid' into 'master'

allow construction of curvedsurfcaegrid with runtime lagrange order

See merge request iwr/dune-curvedsurfacegrid!6

dune/curvedsurfacegrid/backuprestore.hh

@@ -46,10 +46,10 @@ namespace Curved {
 // BackupRestoreFacility for CurvedSurfaceGrid
 // -------------------------------------------
 
-template <class GridFunction, int order>
-struct BackupRestoreFacility<CurvedSurfaceGrid<GridFunction, order>>
+template <class GridFunction, bool useInterpolation>
+struct BackupRestoreFacility<CurvedSurfaceGrid<GridFunction, useInterpolation>>
 {
-  using Grid = CurvedSurfaceGrid<GridFunction, order>;
+  using Grid = CurvedSurfaceGrid<GridFunction, useInterpolation>;
   using HostGrid = typename Grid::HostGrid;
   using HostBackupRestoreFacility = BackupRestoreFacility<HostGrid>;
 

dune/curvedsurfacegrid/capabilities.hh

@@ -19,37 +19,37 @@ namespace Capabilities {
 // Capabilities from dune-grid
 // ---------------------------
 
-template <class GridFunction, int order>
-struct hasSingleGeometryType<CurvedSurfaceGrid<GridFunction,order>>
+template <class GridFunction, bool useInterpolation>
+struct hasSingleGeometryType<CurvedSurfaceGrid<GridFunction,useInterpolation>>
 {
   using HostGrid = GridOf_t<GridFunction>;
   static const bool v = hasSingleGeometryType<HostGrid>::v;
   static const unsigned int topologyId = hasSingleGeometryType<HostGrid>::topologyId;
 };
 
-template <class GridFunction, int order, int codim>
-struct hasEntity<CurvedSurfaceGrid<GridFunction,order>, codim>
+template <class GridFunction, bool useInterpolation, int codim>
+struct hasEntity<CurvedSurfaceGrid<GridFunction,useInterpolation>, codim>
 {
   using HostGrid = GridOf_t<GridFunction>;
   static const bool v = hasEntity<HostGrid,codim>::v;
 };
 
-template <class GridFunction, int order, int codim>
-struct hasEntityIterator<CurvedSurfaceGrid<GridFunction,order>, codim>
+template <class GridFunction, bool useInterpolation, int codim>
+struct hasEntityIterator<CurvedSurfaceGrid<GridFunction,useInterpolation>, codim>
 {
   using HostGrid = GridOf_t<GridFunction>;
   static const bool v = hasEntityIterator<HostGrid,codim>::v;
 };
 
 /// \brief Implements geometry only for codim=0 entity
-template <class GridFunction, int order, int codim>
-struct hasGeometry<CurvedSurfaceGrid<GridFunction,order>, codim>
+template <class GridFunction, bool useInterpolation, int codim>
+struct hasGeometry<CurvedSurfaceGrid<GridFunction,useInterpolation>, codim>
 {
   static const bool v = (codim == 0);
 };
 
-template <class GridFunction, int order, int codim>
-struct canCommunicate<CurvedSurfaceGrid<GridFunction,order>, codim>
+template <class GridFunction, bool useInterpolation, int codim>
+struct canCommunicate<CurvedSurfaceGrid<GridFunction,useInterpolation>, codim>
 {
   using HostGrid = GridOf_t<GridFunction>;
   static const bool v = canCommunicate<HostGrid, codim>::v && hasEntity<HostGrid, codim>::v;
@@ -57,24 +57,24 @@ struct canCommunicate<CurvedSurfaceGrid<GridFunction,order>, codim>
 
 /// \brief Conformity of the grid is not guaranteed since it depends on the GridFunction that
 /// \brief must be continuous in that case.
-template <class GridFunction, int order>
-struct isLevelwiseConforming<CurvedSurfaceGrid<GridFunction,order>>
+template <class GridFunction, bool useInterpolation>
+struct isLevelwiseConforming<CurvedSurfaceGrid<GridFunction,useInterpolation>>
 {
   static const bool v = false;
 };
 
 /// \brief Conformity of the grid is not guaranteed since it depends on the GridFunction that
 /// \brief must be continuous in that case.
-template <class GridFunction, int order>
-struct isLeafwiseConforming<CurvedSurfaceGrid<GridFunction,order>>
+template <class GridFunction, bool useInterpolation>
+struct isLeafwiseConforming<CurvedSurfaceGrid<GridFunction,useInterpolation>>
 {
   static const bool v = false;
 };
 
 /// \brief Implements only partial backup-restore facilities, since the gridfunction is not
 /// \brief backuped automatically.
-template <class GridFunction, int order>
-struct hasBackupRestoreFacilities<CurvedSurfaceGrid<GridFunction,order>>
+template <class GridFunction, bool useInterpolation>
+struct hasBackupRestoreFacilities<CurvedSurfaceGrid<GridFunction,useInterpolation>>
 {
   using HostGrid = GridOf_t<GridFunction>;
   static const bool v = hasBackupRestoreFacilities<HostGrid>::v;
@@ -84,8 +84,8 @@ struct hasBackupRestoreFacilities<CurvedSurfaceGrid<GridFunction,order>>
 // hasHostEntity
 // -------------
 
-template <class GridFunction, int order, int codim>
-struct hasHostEntity<CurvedSurfaceGrid<GridFunction,order>, codim>
+template <class GridFunction, bool useInterpolation, int codim>
+struct hasHostEntity<CurvedSurfaceGrid<GridFunction,useInterpolation>, codim>
 {
   using HostGrid = GridOf_t<GridFunction>;
   static const bool v = hasEntity<HostGrid, codim>::v;

dune/curvedsurfacegrid/datahandle.hh

@@ -42,7 +42,7 @@ public:
   {
     using Entity = typename Grid::Traits::template Codim<HostEntity::codimension>::Entity;
     using EntityImpl = typename Grid::Traits::template Codim<HostEntity::codimension>::EntityImpl;
-    Entity entity(EntityImpl(grid_.gridFunction(), hostEntity));
+    Entity entity(EntityImpl(grid_.gridFunction(), hostEntity, grid_.order()));
     return wrappedHandle_.size(entity);
   }
 
@@ -51,7 +51,7 @@ public:
   {
     using Entity = typename Grid::Traits::template Codim<HostEntity::codimension>::Entity;
     using EntityImpl = typename Grid::Traits::template Codim<HostEntity::codimension>::EntityImpl;
-    Entity entity(EntityImpl(grid_.gridFunction(), hostEntity));
+    Entity entity(EntityImpl(grid_.gridFunction(), hostEntity, grid_.order()));
     wrappedHandle_.gather(buffer, entity);
   }
 
@@ -60,7 +60,7 @@ public:
   {
     using Entity = typename Grid::Traits::template Codim< HostEntity::codimension >::Entity;
     using EntityImpl = typename Grid::Traits::template Codim< HostEntity::codimension >::EntityImpl;
-    Entity entity(EntityImpl(grid_.gridFunction(), hostEntity));
+    Entity entity(EntityImpl(grid_.gridFunction(), hostEntity, grid_.order()));
     wrappedHandle_.scatter(buffer, entity, size);
   }
 

dune/curvedsurfacegrid/declaration.hh

@@ -3,7 +3,7 @@
 
 namespace Dune {
 
-template <class GridFunction, int order>
+template <class GridFunction, bool useInterpolation>
 class CurvedSurfaceGrid;
 
 } // end namespace Dune

dune/curvedsurfacegrid/entity.hh

@@ -107,24 +107,28 @@ public:
   EntityBase (const Grid& grid, const EntitySeed& seed)
     : hostEntity_(grid.hostGrid().entity(seed.impl().hostEntitySeed()))
     , gridFunction_(&grid.gridFunction())
+    , order_(grid.order())
   {}
 
   /// \brief construct the entity from a subentity of a host-entity
-  EntityBase (const GridFunction& gridFunction, const HostElement& hostElement, int i)
+  EntityBase (const GridFunction& gridFunction, const HostElement& hostElement, int i, int order)
     : hostEntity_(hostElement.template subEntity<codim>(i))
     , gridFunction_(&gridFunction)
+    , order_(order)
   {}
 
   /// \brief construct the entity from a host-entity
-  EntityBase (const GridFunction& gridFunction, const HostEntity& hostEntity)
+  EntityBase (const GridFunction& gridFunction, const HostEntity& hostEntity, int order)
     : hostEntity_(hostEntity)
     , gridFunction_(&gridFunction)
+    , order_(order)
   {}
 
   /// \brief construct the entity from a host-entity
-  EntityBase (const GridFunction& gridFunction, HostEntity&& hostEntity)
+  EntityBase (const GridFunction& gridFunction, HostEntity&& hostEntity, int order)
     : hostEntity_(std::move(hostEntity))
     , gridFunction_(&gridFunction)
+    , order_(order)
   {}
 
   /// \brief compare two entities
@@ -185,11 +189,17 @@ public:
     return hostEntity_;
   }
 
+  int order () const
+  {
+    return order_;
+  }
+
   /** \} */
 
 private:
   HostEntity hostEntity_;
   const GridFunction* gridFunction_ = nullptr;
+  int order_ = -1;
 };
 
 
@@ -238,7 +248,7 @@ public:
 
         auto refElem = referenceElement<ctype, Super::dimension>(hostElement_->type());
         auto localGeometry = refElem.template geometry<codim>(subEntity_);
-        geo_ = std::make_shared<GeometryImpl>(Super::type(), std::move(localFct), localGeometry);
+        geo_ = std::make_shared<GeometryImpl>(Super::type(), Super::order(), std::move(localFct), localGeometry);
       }
       else {
         DUNE_THROW(Dune::NotImplemented, "Geometry of entities of codim!=0 not implemented");
@@ -293,7 +303,7 @@ public:
       auto localFct = localFunction(Super::gridFunction());
       localFct.bind(Super::hostEntity());
       auto fakeDefaultGeometry = Dune::DefaultLocalGeometry<typename Super::ctype, Super::mydimension, Super::mydimension>{};
-      geo_ = std::make_shared<GeometryImpl>(Super::type(), std::move(localFct), fakeDefaultGeometry);
+      geo_ = std::make_shared<GeometryImpl>(Super::type(), Super::order(), std::move(localFct), fakeDefaultGeometry);
     }
 
     return Geometry(*geo_);

dune/curvedsurfacegrid/geometry.hh

@@ -20,6 +20,7 @@
 #include <dune/geometry/quadraturerules.hh>
 #include <dune/geometry/referenceelements.hh>
 #include <dune/geometry/type.hh>
+#include <dune/localfunctions/lagrange/lfecache.hh>
 
 #include "localgeometrywrapper.hh"
 
@@ -36,15 +37,17 @@ namespace Curved {
  *  \tparam  LF      localFunction parametrizing the geometry
  *  \tparam  LG      localGeometry for coordinate transform from subEntity to element,
  *                   see \ref Impl::DefaultLocalGeometry and \ref Impl::LocalGeometryInterface
- *  \tparam  ORDER   Polynomial order of lagrange parametrization. If order == -1 use
- *                   a localFunction parametrization. Otherwise interpolate the localfunction
- *                   in the constructor to a local Lagrange basis.
+ *  \tparam  useInterpolation   If set to true, use a Lagrange interpolation of the geometry
  */
-template <class ct, int mydim, int cdim, class LF, class LG, int ORDER = -1>
-class Geometry
-    : public LagrangeCurvedGeometry<ct, mydim, cdim, (ORDER > 0 ? ORDER : 1)>
+template <class ct, int mydim, int cdim, class LF, class LG, bool useInterpolation>
+class Geometry;
+
+
+template <class ct, int mydim, int cdim, class LF, class LG>
+class Geometry<ct,mydim,cdim,LF,LG,true>
+    : public CurvedGeometry<ct, mydim, cdim, CurvedGeometryTraits<ct, LagrangeLFECache<ct,ct,mydim>>>
 {
-  using Super = LagrangeCurvedGeometry<ct, mydim, cdim, (ORDER > 0 ? ORDER : 1)>;
+  using Super = CurvedGeometry<ct, mydim, cdim, CurvedGeometryTraits<ct, LagrangeLFECache<ct,ct,mydim>>>;
 
   /// \brief type of the localFunction representation the geometry parametrization
   using LocalFunction = LF;
@@ -66,11 +69,11 @@ public:
    *
    */
   template <class... Args>
-  Geometry (const ReferenceElement& refElement, const LocalFunction& localFunction, Args&&... args)
+  Geometry (const ReferenceElement& refElement, int order, const LocalFunction& localFunction, Args&&... args)
     : Super(refElement, [localFunction, localGeometry=LocalGeometry{std::forward<Args>(args)...}](const auto& local)
       {
         return localFunction(localGeometry.global(local));
-      })
+      }, order)
   {}
 
   /// \brief constructor, forwarding to the other constructor that take a reference-element
@@ -81,15 +84,15 @@ public:
    *  \param[in]  args...        argument to construct the local geometry
    */
   template <class... Args>
-  Geometry (Dune::GeometryType gt, const LocalFunction& localFunction, Args&&... args)
-    : Geometry(ReferenceElements::general(gt), localFunction, std::forward<Args>(args)...)
+  Geometry (Dune::GeometryType gt, int order, const LocalFunction& localFunction, Args&&... args)
+    : Geometry(ReferenceElements::general(gt), order, localFunction, std::forward<Args>(args)...)
   {}
 };
 
 
-// Specialization for the case that ORDER < 0: Use LocalFunction `LF` directly as parametrization
+// Specialization for the case that no interpolation should be used: Use LocalFunction `LF` directly as parametrization
 template <class ct, int mydim, int cdim, class LF, class LG>
-class Geometry<ct,mydim,cdim,LF,LG,-1>
+class Geometry<ct,mydim,cdim,LF,LG, false>
     : public LocalFunctionGeometry<LF,LG>
 {
   using Super = LocalFunctionGeometry<LF,LG>;
@@ -114,7 +117,7 @@ public:
    *
    */
   template <class LF_, class... Args>
-  Geometry (const ReferenceElement& refElement, LF_&& localFunction, Args&&... args)
+  Geometry (const ReferenceElement& refElement, int, LF_&& localFunction, Args&&... args)
     : Super(refElement, std::forward<LF_>(localFunction), LocalGeometry{std::forward<Args>(args)...})
   {}
 
@@ -126,7 +129,7 @@ public:
    *  \param[in]  args...        argument to construct the local geometry
    */
   template <class LF_, class... Args>
-  Geometry (Dune::GeometryType gt, LF_&& localFunction, Args&&... args)
+  Geometry (Dune::GeometryType gt, int, LF_&& localFunction, Args&&... args)
     : Super(gt, std::forward<LF_>(localFunction), LocalGeometry{std::forward<Args>(args)...})
   {}
 };
@@ -200,17 +203,8 @@ private:
 
 
 // Specialization for vertex geometries
-template <class ct, int cdim, class LF, class LG, int order>
-class Geometry<ct,0,cdim,LF,LG,order>
-    : public VertexGeometry<ct,cdim,LF,LG>
-{
-  using Super = VertexGeometry<ct,cdim,LF,LG>;
-public:
-  using Super::Super;
-};
-
-template <class ct, int cdim, class LF, class LG>
-class Geometry<ct,0,cdim,LF,LG,-1>
+template <class ct, int cdim, class LF, class LG, bool useInterpolation>
+class Geometry<ct,0,cdim,LF,LG, useInterpolation>
     : public VertexGeometry<ct,cdim,LF,LG>
 {
   using Super = VertexGeometry<ct,cdim,LF,LG>;

dune/curvedsurfacegrid/grid.hh

@@ -17,21 +17,21 @@
 namespace Dune {
 namespace Impl {
 
-template <class GridFunction, int order>
+template <class GridFunction, bool useInterpolation>
 struct CurvedSurfaceGridBase
 {
   using HG = GridOf_t<GridFunction>;
 
   using type = GridDefaultImplementation<
     HG::dimension, Curved::DimRange<GridFunction>::value, typename HG::ctype,
-    Curved::GridFamily<GridFunction,order>
+    Curved::GridFamily<GridFunction,useInterpolation>
   >;
 };
 
 } // end namespace Impl
 
-template <class GridFunction, int order>
-using CurvedSurfaceGridBase = typename Impl::CurvedSurfaceGridBase<GridFunction,order>::type;
+template <class GridFunction, bool useInterpolation>
+using CurvedSurfaceGridBase = typename Impl::CurvedSurfaceGridBase<GridFunction,useInterpolation>::type;
 
 
 // CurvedSurfaceGrid
@@ -45,42 +45,41 @@ using CurvedSurfaceGridBase = typename Impl::CurvedSurfaceGridBase<GridFunction,
  *  of a CurvedGeometry.
  *
  *  \tparam GF     GridViewFunction defined on a (flat) hostgrid
- *  \tparam ORDER  Polynomial order of local lagrange basis functions to use when approximating
- *                 the curved geometry. [optional]
+ *  \tparam useInterpolation  If true, use Lagrange interpolation of geometries [false]
  *
  *  \nosubgrouping
  */
-template <class GF, int ORDER = -1>
+template <class GF, bool useInterpolation = false>
 class CurvedSurfaceGrid;
 
 /// \brief Generator for CurvedSurfaceGrid from a grid-functions
-template <class HostGrid, class GF, int ORDER = -1,
+template <class HostGrid, class GF, bool useInterpolation = false,
   std::enable_if_t<Concept::isGridFunction<GF, HostGrid>(), int> = 0>
-auto curvedSurfaceGrid (HostGrid& hostGrid, GF&& gridFunction)
+auto curvedSurfaceGrid (HostGrid& hostGrid, GF&& gridFunction, int order = -1)
 {
   static_assert(std::is_same<HostGrid, GridOf_t<std::decay_t<GF>>>::value, "GridFunction must be defined on the HostGrid");
-  return CurvedSurfaceGrid<std::decay_t<GF>,ORDER>{hostGrid, std::forward<GF>(gridFunction)};
+  return CurvedSurfaceGrid<std::decay_t<GF>,useInterpolation>{hostGrid, std::forward<GF>(gridFunction), order};
 }
 
 /// \brief Generator for CurvedSurfaceGrid from a callable
-template <class HostGrid, class F, int ORDER = -1,
+template <class HostGrid, class F, bool useInterpolation = false,
   std::enable_if_t<not Concept::isGridFunction<F, HostGrid>(), int> = 0>
-auto curvedSurfaceGrid (HostGrid& hostGrid, F&& callable)
+auto curvedSurfaceGrid (HostGrid& hostGrid, F&& callable, int order = -1)
 {
   using GlobalCoordinate = typename GridEntitySet<HostGrid,0>::GlobalCoordinate;
   static_assert(Concept::isCallable<F, GlobalCoordinate>(), "Function must be callable");
   auto gridFct = analyticGridFunction<HostGrid>(std::forward<F>(callable));
-  return CurvedSurfaceGrid<decltype(gridFct),ORDER>{hostGrid, std::move(gridFct)};
+  return CurvedSurfaceGrid<decltype(gridFct),useInterpolation>{hostGrid, std::move(gridFct), order};
 }
 
 
-template <class GF, int ORDER>
+template <class GF, bool useInterpolation>
 class CurvedSurfaceGrid
-    : public CurvedSurfaceGridBase<GF,ORDER>
-    , public Curved::BackupRestoreFacilities<CurvedSurfaceGrid<GF,ORDER>>
+    : public CurvedSurfaceGridBase<GF,useInterpolation>
+    , public Curved::BackupRestoreFacilities<CurvedSurfaceGrid<GF,useInterpolation>>
 {
   using Self = CurvedSurfaceGrid;
-  using Super = CurvedSurfaceGridBase<GF,ORDER>;
+  using Super = CurvedSurfaceGridBase<GF,useInterpolation>;
 
   // friend declarations
   template <class, class> friend class Curved::IdSet;
@@ -88,7 +87,7 @@ class CurvedSurfaceGrid
 
 public:
   using GridFunction = GF;
-  using GridFamily = Curved::GridFamily<GF,ORDER>;
+  using GridFamily = Curved::GridFamily<GF,useInterpolation>;
 
   /** \name Traits
    *  \{ */
@@ -212,22 +211,27 @@ public:
    *  \param[in]  hostGrid      reference to the grid to wrap
    *  \param[in]  gridFunction  mapping from global coordinates in the host geometry
    *                            to global coordinates in the curved geometry
+   *  \param[in]  order         polynomial order of Lagrange functions used to interpolate
+   *                            the geometry, if useInterpolation is true. (optional)
    *
    *  If the gridFunction is passed by (non-const) reference it is stored as a non-destroying shared_ptr.
    *  Otherwise it is copied or moved into a new object (stored as shared_ptr as well).
    */
   template <class GF_,
     std::enable_if_t<std::is_same<GF,std::decay_t<GF_>>::value, int> = 0>
-  CurvedSurfaceGrid (HostGrid& hostGrid, GF_&& gridFunction, std::integral_constant<int,ORDER> = {})
+  CurvedSurfaceGrid (HostGrid& hostGrid, GF_&& gridFunction, int order = -1)
     : hostGrid_(hostGrid)
     , gridFunction_(wrap_or_move(std::forward<GF_>(gridFunction)))
     , levelIndexSets_(hostGrid_.maxLevel()+1, nullptr)
-  {}
+    , order_(order)
+  {
+    assert(!useInterpolation != (order > 0));
+  }
 
   template <class F_,
     std::enable_if_t<std::is_same<GF,AnalyticGridFunction<HostGrid,std::decay_t<F_>>>::value, int> = 0>
-  CurvedSurfaceGrid (HostGrid& hostGrid, F_&& callable, std::integral_constant<int,ORDER> = {})
-    : CurvedSurfaceGrid(hostGrid, analyticGridFunction<HostGrid>(std::forward<F_>(callable)))
+  CurvedSurfaceGrid (HostGrid& hostGrid, F_&& callable, int order = -1)
+    : CurvedSurfaceGrid(hostGrid, analyticGridFunction<HostGrid>(std::forward<F_>(callable)), order)
   {}
 
   /// \brief destructor
@@ -257,7 +261,7 @@ public:
     return hostGrid().maxLevel();
   }
 
-  /// \brief obtain number of entites on a level
+  /// \brief obtain number of entities on a level
   /**
    *  \param[in]  level  level to consider
    *  \param[in]  codim  codimension to consider
@@ -280,7 +284,7 @@ public:
     return leafGridView().size(codim);
   }
 
-  /// \brief obtain number of entites on a level
+  /// \brief obtain number of entities on a level
   /**
    *  \param[in]  level  level to consider
    *  \param[in]  type   geometry type to consider
@@ -403,7 +407,7 @@ public:
   /// \brief rebalance the load each process has to handle
   /**
    *  A parallel grid is redistributed such that each process has about
-   *  the same load (e.g., the same number of leaf entites).
+   *  the same load (e.g., the same number of leaf entities).
    *
    *  \note DUNE does not specify, how the load is measured.
    *
@@ -420,7 +424,7 @@ public:
   /// \brief rebalance the load each process has to handle
   /**
    *  A parallel grid is redistributed such that each process has about
-   *  the same load (e.g., the same number of leaf entites).
+   *  the same load (e.g., the same number of leaf entities).
    *
    *  The data handle is used to communicate the data associated with
    *  entities that move from one process to another.
@@ -529,6 +533,12 @@ public:
     return *gridFunction_;
   }
 
+  /// \brief return the interpolation order for the geometries
+  int order () const
+  {
+    return order_;
+  }
+
   /** \} */
 
 protected:
@@ -547,20 +557,29 @@ private:
   mutable LeafIndexSet leafIndexSet_;
   mutable GlobalIdSet globalIdSet_;
   mutable LocalIdSet localIdSet_;
+
+  int order_; // polynomial order of local geometry interpolation
 };
 
-/// \brief Deduction guide for CurvedSurfaceGrid from a grid-functions or callables
-template <class HostGrid, class GF, int ORDER = -1>
-CurvedSurfaceGrid (HostGrid& hostGrid, GF&& gridFunction, std::integral_constant<int,ORDER> = {})
-  -> CurvedSurfaceGrid<GridFunctionOf_t<HostGrid,std::decay_t<GF>>,ORDER>;
+/// \brief Deduction guide for CurvedSurfaceGrid from a grid-functions or callables if
+/// the local-function of the grid-function should be used directly as geometry parametrization
+template <class HostGrid, class GF>
+CurvedSurfaceGrid (HostGrid& hostGrid, GF&& gridFunction)
+  -> CurvedSurfaceGrid<GridFunctionOf_t<HostGrid,std::decay_t<GF>>, false>;
+
+/// \brief Deduction guide for CurvedSurfaceGrid from a grid-functions or callables if
+/// interpolation should be used
+template <class HostGrid, class GF>
+CurvedSurfaceGrid (HostGrid& hostGrid, GF&& gridFunction, int order)
+  -> CurvedSurfaceGrid<GridFunctionOf_t<HostGrid,std::decay_t<GF>>, true>;
 
 
 // CurvedSurfaceGrid::Codim
 // ------------------------
 
-template <class GridFunction, int ORDER>
+template <class GridFunction, bool useInterpolation>
 template <int codim>
-struct CurvedSurfaceGrid<GridFunction,ORDER>::Codim
+struct CurvedSurfaceGrid<GridFunction,useInterpolation>::Codim
   : public Super::template Codim<codim>
 {
   /** \name Entity types

dune/curvedsurfacegrid/gridfamily.hh

@@ -36,12 +36,12 @@ struct DimRange
 // GridFamily
 // ----------
 
-template <class GF, int order>
+template <class GF, bool useInterpolation>
 struct GridFamily
 {
   struct Traits
   {
-    using Grid = CurvedSurfaceGrid<GF,order>;
+    using Grid = CurvedSurfaceGrid<GF,useInterpolation>;
     using HostGrid = GridOf_t<GF>;
 
     using GridFunction = GF;
@@ -80,7 +80,7 @@ struct GridFamily
 
       template <int mydim, int cdim, class GridImpl>
       using GeometryImplTemplate
-        = Curved::Geometry<ctype, mydim, cdim, LocalFunction, LocalTransformation, order>;
+        = Curved::Geometry<ctype, mydim, cdim, LocalFunction, LocalTransformation, useInterpolation>;
 
       // geometry types
       using GeometryImpl = GeometryImplTemplate<dimension-codim, dimensionworld, const Grid>;
@@ -120,9 +120,9 @@ struct GridFamily
 
     // grid views
     using LeafGridView
-      = Dune::GridView<Curved::GridViewTraits<typename HostGrid::LeafGridView, GF, order>>;
+      = Dune::GridView<Curved::GridViewTraits<typename HostGrid::LeafGridView, GF, useInterpolation>>;
     using LevelGridView
-      = Dune::GridView<Curved::GridViewTraits<typename HostGrid::LevelGridView, GF, order>>;
+      = Dune::GridView<Curved::GridViewTraits<typename HostGrid::LevelGridView, GF, useInterpolation>>;
   };
 };
 

dune/curvedsurfacegrid/gridview.hh

@@ -18,17 +18,17 @@ namespace Curved {
 // Internal Forward Declarations
 // -----------------------------
 
-template <class HGV, class GF, int order>
+template <class HGV, class GF, bool useInterpolation>
 class GridView;
 
 
 // GridViewTraits
 // --------------
 
-template <class HGV, class GF, int order>
+template <class HGV, class GF, bool useInterpolation>
 class GridViewTraits
 {
-  friend class GridView<HGV, GF, order>;
+  friend class GridView<HGV, GF, useInterpolation>;
 
   using HostGridView = HGV;
   using GridFunction = GF;
@@ -38,8 +38,8 @@ class GridViewTraits
   using HostIntersectionIterator = typename HostGridView::IntersectionIterator;
 
 public:
-  using GridViewImp = GridView<HostGridView, GridFunction, order>;
-  using Grid = Dune::CurvedSurfaceGrid<GridFunction, order>;
+  using GridViewImp = GridView<HostGridView, GridFunction, useInterpolation>;
+  using Grid = Dune::CurvedSurfaceGrid<GridFunction, useInterpolation>;
   using IndexSet = Curved::IndexSet<const Grid, typename HostGridView::IndexSet>;
 
   using Intersection = Dune::Intersection<const Grid, Curved::Intersection<const Grid, HostIntersection>>;
@@ -78,13 +78,13 @@ public:
 // GridView
 // --------