Intrepid2_HierarchicalBasis_HCURL_TRI.hpp

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// @HEADER
// *****************************************************************************
//                           Intrepid2 Package
//
// Copyright 2007 NTESS and the Intrepid2 contributors.
// SPDX-License-Identifier: BSD-3-Clause
// *****************************************************************************
// @HEADER

#ifndef Intrepid2_HierarchicalBasis_HCURL_TRI_h
#define Intrepid2_HierarchicalBasis_HCURL_TRI_h

#include <Kokkos_DynRankView.hpp>

#include <Intrepid2_config.h>

#include "Intrepid2_Basis.hpp"
#include "Intrepid2_IntegratedLegendreBasis_HGRAD_LINE.hpp"
#include "Intrepid2_Polynomials.hpp"
#include "Intrepid2_Utils.hpp"

namespace Intrepid2
{
  template<class DeviceType, class OutputScalar, class PointScalar,
           class OutputFieldType, class InputPointsType>
  struct Hierarchical_HCURL_TRI_Functor
  {
    using ExecutionSpace     = typename DeviceType::execution_space;
    using ScratchSpace       = typename ExecutionSpace::scratch_memory_space;
    using OutputScratchView  = Kokkos::View<OutputScalar*,ScratchSpace,Kokkos::MemoryTraits<Kokkos::Unmanaged>>;
    using PointScratchView   = Kokkos::View<PointScalar*, ScratchSpace,Kokkos::MemoryTraits<Kokkos::Unmanaged>>;
    
    using TeamPolicy = Kokkos::TeamPolicy<ExecutionSpace>;
    using TeamMember = typename TeamPolicy::member_type;
    
    EOperator opType_;
    
    OutputFieldType  output_;      // F,P
    InputPointsType  inputPoints_; // P,D
    
    int polyOrder_;
    int numFields_, numPoints_;
    
    size_t fad_size_output_;
    
    static const int numVertices     = 3;
    static const int numEdges        = 3;
    static const int numFaceFamilies = 2;
    const int edge_start_[numEdges] = {0,1,0}; // edge i is from edge_start_[i] to edge_end_[i]
    const int edge_end_[numEdges]   = {1,2,2}; // edge i is from edge_start_[i] to edge_end_[i]
    const int face_family_start_[numFaceFamilies]  = {0,1};
    const int face_family_middle_[numFaceFamilies] = {1,2};
    const int face_family_end_   [numFaceFamilies] = {2,0};
    
    Hierarchical_HCURL_TRI_Functor(EOperator opType, OutputFieldType output, InputPointsType inputPoints, int polyOrder)
    : opType_(opType), output_(output), inputPoints_(inputPoints),
      polyOrder_(polyOrder),
      fad_size_output_(getScalarDimensionForView(output))
    {
      numFields_ = output.extent_int(0);
      numPoints_ = output.extent_int(1);
      const int expectedCardinality = 3 * polyOrder_ + polyOrder_ * (polyOrder-1);
      
      INTREPID2_TEST_FOR_EXCEPTION(numPoints_ != inputPoints.extent_int(0), std::invalid_argument, "point counts need to match!");
      INTREPID2_TEST_FOR_EXCEPTION(numFields_ != expectedCardinality, std::invalid_argument, "output field size does not match basis cardinality");
    }
    
    KOKKOS_INLINE_FUNCTION
    void operator()( const TeamMember & teamMember ) const
    {
      auto pointOrdinal = teamMember.league_rank();
      OutputScratchView edge_field_values_at_point, jacobi_values_at_point, other_values_at_point, other_values2_at_point;
      if (fad_size_output_ > 0) {
        edge_field_values_at_point = OutputScratchView(teamMember.team_shmem(), polyOrder_, fad_size_output_);
        jacobi_values_at_point     = OutputScratchView(teamMember.team_shmem(), polyOrder_, fad_size_output_);
        other_values_at_point      = OutputScratchView(teamMember.team_shmem(), polyOrder_, fad_size_output_);
        other_values2_at_point     = OutputScratchView(teamMember.team_shmem(), polyOrder_, fad_size_output_);
      }
      else {
        edge_field_values_at_point = OutputScratchView(teamMember.team_shmem(), polyOrder_);
        jacobi_values_at_point     = OutputScratchView(teamMember.team_shmem(), polyOrder_);
        other_values_at_point      = OutputScratchView(teamMember.team_shmem(), polyOrder_);
        other_values2_at_point     = OutputScratchView(teamMember.team_shmem(), polyOrder_);
      }
      
      const auto & x = inputPoints_(pointOrdinal,0);
      const auto & y = inputPoints_(pointOrdinal,1);
      
      // write as barycentric coordinates:
      const PointScalar lambda[3]    = {1. - x - y, x, y};
      const PointScalar lambda_dx[3] = {-1., 1., 0.};
      const PointScalar lambda_dy[3] = {-1., 0., 1.};
      
      const int num1DEdgeFunctions = polyOrder_; // per edge
      
      switch (opType_)
      {
        case OPERATOR_VALUE:
        {
          // edge functions
          int fieldOrdinalOffset = 0;
          for (int edgeOrdinal=0; edgeOrdinal<numEdges; edgeOrdinal++)
          {
            const auto & s0    = lambda   [edge_start_[edgeOrdinal]];
            const auto & s0_dx = lambda_dx[edge_start_[edgeOrdinal]];
            const auto & s0_dy = lambda_dy[edge_start_[edgeOrdinal]];
            
            const auto & s1    = lambda   [  edge_end_[edgeOrdinal]];
            const auto & s1_dx = lambda_dx[  edge_end_[edgeOrdinal]];
            const auto & s1_dy = lambda_dy[  edge_end_[edgeOrdinal]];
            
            Polynomials::shiftedScaledLegendreValues(edge_field_values_at_point, polyOrder_-1, PointScalar(s1), PointScalar(s0+s1));
            for (int edgeFunctionOrdinal=0; edgeFunctionOrdinal<num1DEdgeFunctions; edgeFunctionOrdinal++)
            {
              const auto & legendreValue = edge_field_values_at_point(edgeFunctionOrdinal);
              const PointScalar xWeight = s0 * s1_dx - s1 * s0_dx;
              const PointScalar yWeight = s0 * s1_dy - s1 * s0_dy;
              output_(edgeFunctionOrdinal+fieldOrdinalOffset,pointOrdinal,0) = legendreValue * xWeight;
              output_(edgeFunctionOrdinal+fieldOrdinalOffset,pointOrdinal,1) = legendreValue * yWeight;
            }
            fieldOrdinalOffset += num1DEdgeFunctions;
          }
          
          // face functions
          {
            // these functions multiply the edge functions from the 01 edge by integrated Jacobi functions, appropriately scaled
            const double jacobiScaling = 1.0; // s0 + s1 + s2
            
            const int max_ij_sum = polyOrder_ - 1;
            
            // following ESEAS, we interleave the face families.  This groups all the face dofs of a given degree together.
            const int faceFieldOrdinalOffset = fieldOrdinalOffset;
            for (int familyOrdinal=1; familyOrdinal<=2; familyOrdinal++)
            {
              int fieldOrdinal = faceFieldOrdinalOffset + familyOrdinal - 1;
              const auto &s2 = lambda[ face_family_end_[familyOrdinal-1]];
              for (int ij_sum=1; ij_sum <= max_ij_sum; ij_sum++)
              {
                for (int i=0; i<ij_sum; i++)
                {
                  const int j = ij_sum - i; // j >= 1
                  // family 1 involves edge functions from edge (0,1) (edgeOrdinal 0); family 2 involves functions from edge (1,2) (edgeOrdinal 1)
                  const int edgeBasisOrdinal = i + (familyOrdinal-1)*num1DEdgeFunctions;
                  const auto & edgeValue_x = output_(edgeBasisOrdinal,pointOrdinal,0);
                  const auto & edgeValue_y = output_(edgeBasisOrdinal,pointOrdinal,1);
                  const double alpha = i*2.0 + 1;
                  
                  Polynomials::shiftedScaledIntegratedJacobiValues(jacobi_values_at_point, alpha, polyOrder_-1, s2, jacobiScaling);
                  const auto & jacobiValue = jacobi_values_at_point(j);
                  output_(fieldOrdinal,pointOrdinal,0) = edgeValue_x * jacobiValue;
                  output_(fieldOrdinal,pointOrdinal,1) = edgeValue_y * jacobiValue;
                  
                  fieldOrdinal += 2; // 2 because there are two face families, and we interleave them.
                }
              }
            }
          }
        } // end OPERATOR_VALUE
          break;
        case OPERATOR_CURL:
        {
          // edge functions
          int fieldOrdinalOffset = 0;
          /*
           Per Fuentes et al. (see Appendix E.1, E.2), the curls of the edge functions, are
             (i+2) * [P_i](s0,s1) * (grad s0 \times grad s1)
           The P_i we have implemented in shiftedScaledLegendreValues.
           */
          // rename the scratch memory to match our usage here:
          auto & P_i      = edge_field_values_at_point;
          auto & L_2ip1_j = jacobi_values_at_point;
          for (int edgeOrdinal=0; edgeOrdinal<numEdges; edgeOrdinal++)
          {
            const auto & s0 = lambda[edge_start_[edgeOrdinal]];
            const auto & s1 = lambda[  edge_end_[edgeOrdinal]];
            
            const auto & s0_dx = lambda_dx[edge_start_[edgeOrdinal]];
            const auto & s0_dy = lambda_dy[edge_start_[edgeOrdinal]];
            const auto & s1_dx = lambda_dx[  edge_end_[edgeOrdinal]];
            const auto & s1_dy = lambda_dy[  edge_end_[edgeOrdinal]];
            
            const OutputScalar grad_s0_cross_grad_s1 = s0_dx * s1_dy - s1_dx * s0_dy;
            
            Polynomials::shiftedScaledLegendreValues(P_i, polyOrder_-1, PointScalar(s1), PointScalar(s0+s1));
            for (int i=0; i<num1DEdgeFunctions; i++)
            {
              output_(i+fieldOrdinalOffset,pointOrdinal) = (i+2) * P_i(i) * grad_s0_cross_grad_s1;
            }
            fieldOrdinalOffset += num1DEdgeFunctions;
          }
          
          /*
           Fuentes et al give the face functions as E^f_{ij}, with curl:
             [L^{2i+1}_j](s0+s1,s2) curl(E^E_i(s0,s1)) + grad[L^(2i+1)_j](s0+s1,s2) \times E^E_i(s0,s1)
           where:
           - E^E_i is the ith edge function on the edge s0 to s1
           - L^{2i+1}_j is an shifted, scaled integrated Jacobi polynomial.
           - For family 1, s0s1s2 = 012
           - For family 2, s0s1s2 = 120
           - Note that grad[L^(2i+1)_j](s0+s1,s2) is computed as [P^{2i+1}_{j-1}](s0+s1,s2) (grad s2) + [R^{2i+1}_{j-1}] grad (s0+s1+s2),
             but for triangles (s0+s1+s2) is always 1, so that the grad (s0+s1+s2) is 0.
           - Here,
               [P^{2i+1}_{j-1}](s0,s1) = P^{2i+1}_{j-1}(s1,s0+s1)
             and
               [R^{2i+1}_{j-1}(s0,s1)] = d/dt L^{2i+1}_j(s1,s0+s1)
             We have implemented P^{alpha}_{j} as shiftedScaledJacobiValues,
             and d/dt L^{alpha}_{j} as shiftedScaledIntegratedJacobiValues_dt.
           */
          // rename the scratch memory to match our usage here:
          auto & P_2ip1_j    = other_values_at_point;
          
          // following ESEAS, we interleave the face families.  This groups all the face dofs of a given degree together.
          const int faceFieldOrdinalOffset = fieldOrdinalOffset;
          for (int familyOrdinal=1; familyOrdinal<=2; familyOrdinal++)
          {
            int fieldOrdinal = faceFieldOrdinalOffset + familyOrdinal - 1;
            
            const auto &s0_index = face_family_start_ [familyOrdinal-1];
            const auto &s1_index = face_family_middle_[familyOrdinal-1];
            const auto &s2_index = face_family_end_   [familyOrdinal-1];
            const auto &s0 = lambda[s0_index];
            const auto &s1 = lambda[s1_index];
            const auto &s2 = lambda[s2_index];
            const double jacobiScaling = 1.0; // s0 + s1 + s2
            
            const auto & s0_dx = lambda_dx[s0_index];
            const auto & s0_dy = lambda_dy[s0_index];
            const auto & s1_dx = lambda_dx[s1_index];
            const auto & s1_dy = lambda_dy[s1_index];
            const auto & s2_dx = lambda_dx[s2_index];
            const auto & s2_dy = lambda_dy[s2_index];
            
            const OutputScalar grad_s0_cross_grad_s1 = s0_dx * s1_dy - s1_dx * s0_dy;
            
            Polynomials::shiftedScaledLegendreValues (P_i, polyOrder_-1, PointScalar(s1), PointScalar(s0+s1));
            // [L^{2i+1}_j](s0+s1,s2) curl(E^E_i(s0,s1)) + grad[L^(2i+1)_j](s0+s1,s2) \times E^E_i(s0,s1)
            // grad[L^(2i+1)_j](s0+s1,s2) \times E^E_i(s0,s1)
//                - Note that grad[L^(2i+1)_j](s0+s1,s2) is computed as [P^{2i+1}_{j-1}](s0+s1,s2) (grad s2) + [R^{2i+1}_{j-1}] grad (s0+s1+s2),
            const PointScalar xEdgeWeight = s0 * s1_dx - s1 * s0_dx;
            const PointScalar yEdgeWeight = s0 * s1_dy - s1 * s0_dy;
            OutputScalar grad_s2_cross_xy_edgeWeight = s2_dx * yEdgeWeight - xEdgeWeight * s2_dy;
            
            const int max_ij_sum = polyOrder_ - 1;
            for (int ij_sum=1; ij_sum <= max_ij_sum; ij_sum++)
            {
              for (int i=0; i<ij_sum; i++)
              {
                const int j = ij_sum - i; // j >= 1
                const OutputScalar edgeCurl = (i+2.) * P_i(i) * grad_s0_cross_grad_s1;
              
                const double alpha = i*2.0 + 1;
                
                Polynomials::shiftedScaledJacobiValues(P_2ip1_j, alpha, polyOrder_-1, PointScalar(s2), jacobiScaling);
                Polynomials::shiftedScaledIntegratedJacobiValues(L_2ip1_j, alpha, polyOrder_-1, s2, jacobiScaling);
              
                const PointScalar & edgeValue = P_i(i);
                output_(fieldOrdinal,pointOrdinal) = L_2ip1_j(j) * edgeCurl + P_2ip1_j(j-1) * edgeValue * grad_s2_cross_xy_edgeWeight;
                
                fieldOrdinal += 2; // 2 because there are two face families, and we interleave them.
              }
            }
          }
        }
          break;
        case OPERATOR_GRAD:
        case OPERATOR_D1:
        case OPERATOR_D2:
        case OPERATOR_D3:
        case OPERATOR_D4:
        case OPERATOR_D5:
        case OPERATOR_D6:
        case OPERATOR_D7:
        case OPERATOR_D8:
        case OPERATOR_D9:
        case OPERATOR_D10:
          INTREPID2_TEST_FOR_ABORT( true,
                                   ">>> ERROR: (Intrepid2::Hierarchical_HCURL_TRI_Functor) Unsupported differential operator");
        default:
          // unsupported operator type
          device_assert(false);
      }
    }
    
    // Provide the shared memory capacity.
    // This function takes the team_size as an argument,
    // which allows team_size-dependent allocations.
    size_t team_shmem_size (int team_size) const
    {
      // we will use shared memory to create a fast buffer for basis computations
      size_t shmem_size = 0;
      if (fad_size_output_ > 0)
        shmem_size += 4 * OutputScratchView::shmem_size(polyOrder_ + 1, fad_size_output_);
      else
        shmem_size += 4 * OutputScratchView::shmem_size(polyOrder_ + 1);
      
      return shmem_size;
    }
  };
  
  template<typename DeviceType,
           typename OutputScalar = double,
           typename PointScalar  = double,
           bool useCGBasis = true> // if useCGBasis is false, all basis functions will be associated with the interior
  class HierarchicalBasis_HCURL_TRI
  : public Basis<DeviceType,OutputScalar,PointScalar>
  {
  public:
    using BasisBase = Basis<DeviceType,OutputScalar,PointScalar>;
    
    using HostBasis = HierarchicalBasis_HCURL_TRI<typename Kokkos::HostSpace::device_type, OutputScalar, PointScalar, useCGBasis>;

    using typename BasisBase::OrdinalTypeArray1DHost;
    using typename BasisBase::OrdinalTypeArray2DHost;

    using typename BasisBase::OutputViewType;
    using typename BasisBase::PointViewType;
    using typename BasisBase::ScalarViewType;

    using typename BasisBase::ExecutionSpace;

  protected:
    int polyOrder_; // the maximum order of the polynomial
  public:
    HierarchicalBasis_HCURL_TRI(int polyOrder, const EPointType pointType=POINTTYPE_DEFAULT)
    :
    polyOrder_(polyOrder)
    {
      const int numEdgeFunctions  = polyOrder * 3;
      const int numFaceFunctions  = polyOrder * (polyOrder-1);  // two families, each with p*(p-1)/2 functions
      this->basisCardinality_     = numEdgeFunctions + numFaceFunctions;
      this->basisDegree_          = polyOrder;
      this->basisCellTopologyKey_ = shards::Triangle<>::key;
      this->basisType_            = BASIS_FEM_HIERARCHICAL;
      this->basisCoordinates_     =  COORDINATES_CARTESIAN;
      this->functionSpace_        = FUNCTION_SPACE_HCURL;
      
      const int degreeLength = 1;
      this->fieldOrdinalPolynomialDegree_ = OrdinalTypeArray2DHost("Hierarchical H(curl) triangle polynomial degree lookup", this->basisCardinality_, degreeLength);
      this->fieldOrdinalH1PolynomialDegree_ = OrdinalTypeArray2DHost("Hierarchical H(curl) triangle polynomial H^1 degree lookup", this->basisCardinality_, degreeLength);
      
      int fieldOrdinalOffset = 0;
      // **** vertex functions **** //
      // no vertex functions in H(curl)
      
      // **** edge functions **** //
      const shards::CellTopology cellTopo(shards::getCellTopologyData<shards::Triangle<> >());
      const int numFunctionsPerEdge = polyOrder; // p functions associated with each edge
      const int numEdges            = cellTopo.getEdgeCount();
      for (int edgeOrdinal=0; edgeOrdinal<numEdges; edgeOrdinal++)
      {
        for (int i=0; i<numFunctionsPerEdge; i++)
        {
          this->fieldOrdinalPolynomialDegree_(i+fieldOrdinalOffset,0) = i+1; // the multiplicands involving the gradients of the vertex functions are first degree polynomials; hence the +1 (the remaining multiplicands are order i = 0,…,p-1).
          this->fieldOrdinalH1PolynomialDegree_(i+fieldOrdinalOffset,0) = i+2;
        }
        fieldOrdinalOffset += numFunctionsPerEdge;
      }
      INTREPID2_TEST_FOR_EXCEPTION(fieldOrdinalOffset != numEdgeFunctions, std::invalid_argument, "Internal error: basis enumeration is incorrect");
      
      // **** face functions **** //
      const int max_ij_sum = polyOrder-1;
      const int faceFieldOrdinalOffset = fieldOrdinalOffset;
      for (int faceFamilyOrdinal=1; faceFamilyOrdinal<=2; faceFamilyOrdinal++)
      {
        // following ESEAS, we interleave the face families.  This groups all the face dofs of a given degree together.
        int fieldOrdinal = faceFieldOrdinalOffset + faceFamilyOrdinal - 1;
        for (int ij_sum=1; ij_sum <= max_ij_sum; ij_sum++)
        {
          for (int i=0; i<ij_sum; i++)
          {
            this->fieldOrdinalPolynomialDegree_(fieldOrdinal,0) = ij_sum+1;
            this->fieldOrdinalH1PolynomialDegree_(fieldOrdinal,0) = ij_sum+2;
            fieldOrdinal += 2; // 2 because there are two face families, and we interleave them.
          }
        }
        fieldOrdinalOffset = fieldOrdinal - 1; // due to the interleaving increment, we've gone two past the last face ordinal.  Set offset to be one past.
      }

      INTREPID2_TEST_FOR_EXCEPTION(fieldOrdinalOffset != this->basisCardinality_, std::invalid_argument, "Internal error: basis enumeration is incorrect");
      
      // initialize tags
      {
        const auto & cardinality = this->basisCardinality_;
        
        // Basis-dependent initializations
        const ordinal_type tagSize  = 4;        // size of DoF tag, i.e., number of fields in the tag
        const ordinal_type posScDim = 0;        // position in the tag, counting from 0, of the subcell dim
        const ordinal_type posScOrd = 1;        // position in the tag, counting from 0, of the subcell ordinal
        const ordinal_type posDfOrd = 2;        // position in the tag, counting from 0, of DoF ordinal relative to the subcell
        
        OrdinalTypeArray1DHost tagView("tag view", cardinality*tagSize);
        const ordinal_type edgeDim = 1, faceDim = 2;

        if (useCGBasis) {
          {
            int tagNumber = 0;
            for (int edgeOrdinal=0; edgeOrdinal<numEdges; edgeOrdinal++)
            {
              for (int functionOrdinal=0; functionOrdinal<numFunctionsPerEdge; functionOrdinal++)
              {
                tagView(tagNumber*tagSize+0) = edgeDim;               // edge dimension
                tagView(tagNumber*tagSize+1) = edgeOrdinal;           // edge id
                tagView(tagNumber*tagSize+2) = functionOrdinal;       // local dof id
                tagView(tagNumber*tagSize+3) = numFunctionsPerEdge;   // total number of dofs on this edge
                tagNumber++;
              }
            }
            const int numFunctionsPerFace = numFaceFunctions; // just one face in the triangle
            const int numFaces = 1;
            for (int faceOrdinal=0; faceOrdinal<numFaces; faceOrdinal++)
            {
              for (int functionOrdinal=0; functionOrdinal<numFunctionsPerFace; functionOrdinal++)
              {
                tagView(tagNumber*tagSize+0) = faceDim;               // face dimension
                tagView(tagNumber*tagSize+1) = faceOrdinal;           // face id
                tagView(tagNumber*tagSize+2) = functionOrdinal;       // local dof id
                tagView(tagNumber*tagSize+3) = numFunctionsPerFace;   // total number of dofs on this face
                tagNumber++;
              }
            }
          }
        }
        else
        {
          // DG basis: all functions are associated with interior
          for (ordinal_type i=0;i<cardinality;++i) {
            tagView(i*tagSize+0) = faceDim;     // face dimension
            tagView(i*tagSize+1) = 0;           // face id
            tagView(i*tagSize+2) = i;           // local dof id
            tagView(i*tagSize+3) = cardinality; // total number of dofs on this face
          }
        }
        
        // Basis-independent function sets tag and enum data in tagToOrdinal_ and ordinalToTag_ arrays:
        // tags are constructed on host
        this->setOrdinalTagData(this->tagToOrdinal_,
                                this->ordinalToTag_,
                                tagView,
                                this->basisCardinality_,
                                tagSize,
                                posScDim,
                                posScOrd,
                                posDfOrd);
      }
    }
    
    const char* getName() const override {
      return "Intrepid2_HierarchicalBasis_HCURL_TRI";
    }
    
    virtual bool requireOrientation() const override {
      return (this->getDegree() > 2);
    }

    // since the getValues() below only overrides the FEM variant, we specify that
    // we use the base class's getValues(), which implements the FVD variant by throwing an exception.
    // (It's an error to use the FVD variant on this basis.)
    using BasisBase::getValues;
    
    virtual void getValues( OutputViewType outputValues, const PointViewType inputPoints,
                           const EOperator operatorType = OPERATOR_VALUE ) const override
    {
      auto numPoints = inputPoints.extent_int(0);
      
      using FunctorType = Hierarchical_HCURL_TRI_Functor<DeviceType, OutputScalar, PointScalar, OutputViewType, PointViewType>;
      
      FunctorType functor(operatorType, outputValues, inputPoints, polyOrder_);
      
      const int outputVectorSize = getVectorSizeForHierarchicalParallelism<OutputScalar>();
      const int pointVectorSize  = getVectorSizeForHierarchicalParallelism<PointScalar>();
      const int vectorSize = std::max(outputVectorSize,pointVectorSize);
      const int teamSize = 1; // because of the way the basis functions are computed, we don't have a second level of parallelism...

      auto policy = Kokkos::TeamPolicy<ExecutionSpace>(numPoints,teamSize,vectorSize);
      Kokkos::parallel_for("Hierarchical_HCURL_TRI_Functor", policy, functor);
    }

    BasisPtr<DeviceType,OutputScalar,PointScalar>
      getSubCellRefBasis(const ordinal_type subCellDim, const ordinal_type subCellOrd) const override{
      if(subCellDim == 1) {
        return Teuchos::rcp(new
            LegendreBasis_HVOL_LINE<DeviceType,OutputScalar,PointScalar>
                    (this->basisDegree_-1));
      }
      INTREPID2_TEST_FOR_EXCEPTION(true,std::invalid_argument,"Input parameters out of bounds");
    }

    virtual BasisPtr<typename Kokkos::HostSpace::device_type, OutputScalar, PointScalar>
    getHostBasis() const override {
      using HostDeviceType = typename Kokkos::HostSpace::device_type;
      using HostBasisType  = HierarchicalBasis_HCURL_TRI<HostDeviceType, OutputScalar, PointScalar, useCGBasis>;
      return Teuchos::rcp( new HostBasisType(polyOrder_) );
    }
  };
} // end namespace Intrepid2

#endif /* Intrepid2_HierarchicalBasis_HCURL_TRI_h */