bccsmatrix.hh

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// SPDX-FileCopyrightText: Copyright © DUNE Project contributors, see file LICENSE.md in module root
// SPDX-License-Identifier: LicenseRef-GPL-2.0-only-with-DUNE-exception
// -*- tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
// vi: set et ts=4 sw=2 sts=2:
#ifndef DUNE_ISTL_BCCSMATRIX_HH
#define DUNE_ISTL_BCCSMATRIX_HH
 
#include <dune/common/fmatrix.hh>
#include <dune/common/fvector.hh>
#include <dune/common/typetraits.hh>
 
namespace Dune::ISTL::Impl
{
  template<class B, class I = typename std::allocator<B>::size_type>
  class BCCSMatrix
  {
  public:
    using Index = I;
    using size_type = std::size_t;

    BCCSMatrix()
    : N_(0), M_(0), Nnz_(0), values(0), rowindex(0), colstart(0)
    {}

    ~BCCSMatrix()
    {
      if(N_+M_+Nnz_!=0)
        free();
    }

    void setSize(size_type rows, size_type columns)
    {
      N_ = rows;
      M_ = columns;
    }

    size_type N() const
    {
      return N_;
    }

    size_type nonzeroes() const
    {
      return Nnz_;
    }

    size_type M() const
    {
      return M_;
    }

    B* getValues() const
    {
      return values;
    }

    Index* getRowIndex() const
    {
      return rowindex;
    }

    Index* getColStart() const
    {
      return colstart;
    }

    BCCSMatrix& operator=(const BCCSMatrix& mat)
    {
      if(N_+M_+Nnz_!=0)
        free();
      N_=mat.N_;
      M_=mat.M_;
      Nnz_= mat.Nnz_;
      if(M_>0) {
        colstart=new size_type[M_+1];
        for(size_type i=0; i<=M_; ++i)
          colstart[i]=mat.colstart[i];
      }
 
      if(Nnz_>0) {
        values = new B[Nnz_];
        rowindex = new size_type[Nnz_];
 
        for(size_type i=0; i<Nnz_; ++i)
          values[i]=mat.values[i];
 
        for(size_type i=0; i<Nnz_; ++i)
          rowindex[i]=mat.rowindex[i];
      }
      return *this;
    }

    virtual void free()
    {
      delete[] values;
      delete[] rowindex;
      delete[] colstart;
      N_ = 0;
      M_ = 0;
      Nnz_ = 0;
    }
 
  public:
    size_type N_, M_, Nnz_;
    B* values;
    Index* rowindex;
    Index* colstart;
  };
 
}
#endif