source: trunk/yat/utility/VectorConstView.cc @ 1714

// $Id: VectorConstView.cc 1714 2009-01-13 19:58:08Z peter $

/*
  Copyright (C) 2003 Daniel Dalevi, Peter Johansson
  Copyright (C) 2004 Jari Häkkinen, Peter Johansson
  Copyright (C) 2005, 2006, 2007 Jari Häkkinen, Peter Johansson, Markus Ringnér
  Copyright (C) 2008, 2009 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 "VectorConstView.h"
#include "Matrix.h"

namespace theplu {
namespace yat {
namespace utility {


  VectorConstView::VectorConstView(const VectorConstView& other)
    : VectorBase(), const_view_(NULL)
  {
    copy(other);
  }


  VectorConstView::VectorConstView(const VectorBase& other)
    : VectorBase(), const_view_(NULL)
  {
    copy(other);
  }


  VectorConstView::VectorConstView(const VectorBase& v, size_t offset,size_t n,
                                   size_t stride)
    : VectorBase()
  {
    const_view_ = new gsl_vector_const_view(
                   gsl_vector_const_subvector_with_stride(v.gsl_vector_p(), 
                                                          offset, stride,n));
    const_vec_ = &(const_view_->vector);
  }


  VectorConstView::VectorConstView(const Matrix& m, size_t i, bool row)
    : VectorBase(), const_view_(NULL)
  {
    const_view_ = 
      new gsl_vector_const_view(row ? 
                                gsl_matrix_const_row(m.gsl_matrix_p(),i) :
                                gsl_matrix_const_column(m.gsl_matrix_p(),i));
    const_vec_ = &(const_view_->vector);
  }


  VectorConstView::~VectorConstView(void)
  {
    delete_allocated_memory();
  }


  void VectorConstView::copy(const VectorBase& other)
  {
    const_view_ = 
      new gsl_vector_const_view(gsl_vector_const_subvector(other.gsl_vector_p(), 
                                                           0, other.size()));
    const_vec_ = &(const_view_->vector);
  }


  void VectorConstView::delete_allocated_memory(void)
  {
    delete const_view_;
    const_view_=NULL;
    const_vec_ = NULL;
  }


  bool VectorConstView::isview(void) const
  {
    return true;
  }

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