prestriction.hpp

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// Copyright (c) 2010-2020, Lawrence Livermore National Security, LLC. Produced
// at the Lawrence Livermore National Laboratory. All Rights reserved. See files
// LICENSE and NOTICE for details. LLNL-CODE-806117.
//
// This file is part of the MFEM library. For more information and source code
// availability visit https://mfem.org.
//
// MFEM is free software; you can redistribute it and/or modify it under the
// terms of the BSD-3 license. We welcome feedback and contributions, see file
// CONTRIBUTING.md for details.

#ifndef MFEM_PRESTRICTION
#define MFEM_PRESTRICTION

#include "../config/config.hpp"

#ifdef MFEM_USE_MPI

#include "restriction.hpp"

namespace mfem
{

class ParFiniteElementSpace;

/// Operator that extracts Face degrees of freedom in parallel.
/** Objects of this type are typically created and owned by FiniteElementSpace
    objects, see FiniteElementSpace::GetFaceRestriction(). */
class ParL2FaceRestriction : public Operator
{
protected:
   const ParFiniteElementSpace &fes;
   const int nf;
   const int vdim;
   const bool byvdim;
   const int ndofs;
   const int dof;
   const L2FaceValues m;
   const int nfdofs;
   Array<int> scatter_indices1;
   Array<int> scatter_indices2;
   Array<int> offsets;
   Array<int> gather_indices;

public:
   ParL2FaceRestriction(const ParFiniteElementSpace&, ElementDofOrdering,
                        FaceType type,
                        L2FaceValues m = L2FaceValues::DoubleValued);
   void Mult(const Vector &x, Vector &y) const;
   void MultTranspose(const Vector &x, Vector &y) const;
};

}

#endif // MFEM_USE_MPI

#endif //MFEM_PRESTRICTION