VectorView.h

#ifndef _theplu_yat_utility_vector_view_
#define _theplu_yat_utility_vector_view_

// $Id: VectorView.h 4207 2022-08-26 04:36:28Z peter $

/*
  Copyright (C) 2003 Daniel Dalevi, Peter Johansson
  Copyright (C) 2004 Jari Häkkinen, Peter Johansson
  Copyright (C) 2005 Jari Häkkinen, Peter Johansson, Markus Ringnér
  Copyright (C) 2006 Jari Häkkinen, Markus Ringnér
  Copyright (C) 2007 Jari Häkkinen, Peter Johansson, Markus Ringnér
  Copyright (C) 2008 Jari Häkkinen, Peter Johansson
  Copyright (C) 2012, 2017, 2021, 2022 Peter Johansson

  This file is part of the yat library, http://dev.thep.lu.se/trac/yat

  The yat library is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License as
  published by the Free Software Foundation; either version 3 of the
  License, or (at your option) any later version.

  The yat library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with yat. If not, see <http://www.gnu.org/licenses/>.
*/

#include "VectorMutable.h"

#include <gsl/gsl_vector.h>

namespace theplu {
namespace yat {
namespace utility {

  class MatrixMutable;
  class Vector;

  class VectorView : public VectorMutable
  {
  public:
    VectorView(void);

    VectorView(VectorView& other);

    explicit VectorView(VectorMutable& other);

    VectorView(VectorMutable& v, size_t offset, size_t n, size_t stride=1);

    VectorView(MatrixMutable& m, size_t i, bool row=true);

    explicit VectorView(gsl_vector* v);

    VectorView(double* v, size_t size, size_t stride=1);

    ~VectorView(void);

    bool isview(void) const;

    const VectorView& operator=(const VectorView&);

    const VectorView& operator=(const VectorBase&);

    template<class T>
    VectorView& operator=(const VectorExpression<T>& rhs)
    {
      assign(rhs.gsl_vector_p());
      return *this;
    }

  private:
    const VectorView& assign(const VectorBase& other);
    const VectorView& assign(const gsl_vector* rhs);
    void copy(gsl_vector*);
    void delete_allocated_memory(void);

    gsl_vector_view* view_;

    struct proxy
    {
      gsl_vector* vec_;
    };

  public:
    VectorView(proxy p);

    operator proxy();
  };

}}} // of namespace utility, yat, and theplu

#endif