surrounding_dimensions.cc

// -*- mode: c++; fill-column: 80; c-basic-offset: 2; indent-tabs-mode: nil -*-
/*
    Copyright (c) 2010 Juan Jose Garcia Ripoll

    Tensor is free software; you can redistribute it and/or modify it
    under the terms of the GNU Library General Public License as published
    by the Free Software Foundation; either version 2 of the License, or
    (at your option) any later version.

    This program 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 Library General Public License for more details.

    You should have received a copy of the GNU General Public License along
    with this program; if not, write to the Free Software Foundation, Inc.,
    51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/

#include <tensor/indices.h>

namespace tensor {

  void
  surrounding_dimensions(const Indices &d, index ndx,
                         index *d1, index *d2, index *d3)
  {
    index i, l = d.size();
    for (i = 0, *d1 = 1; i < ndx; i++) {
      *d1 *= d[i];
    }
    *d2 = d[i++];
    for (*d3 = 1; i < l; i++) {
      *d3 *= d[i];
    }
  }

} // namespace tensor