////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 1994-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave 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.
//
// Octave 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 Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
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////////////////////////////////////////////////////////////////////////

#if ! defined (octave_qrp_h)
#define octave_qrp_h 1

#include "octave-config.h"

#include "PermMatrix.h"
#include "qr.h"

namespace octave
{
  namespace math
  {
    template <typename T>
    class
    qrp : public qr<T>
    {
    public:

      typedef typename T::real_row_vector_type RV_T;

      typedef typename qr<T>::type type;

      qrp (void) : qr<T> (), p () { }

      qrp (const T&, type = qr<T>::std);

      qrp (const qrp& a) : qr<T> (a), p (a.p) { }

      qrp& operator = (const qrp& a)
      {
        if (this != &a)
          {
            qr<T>::operator = (a);
            p = a.p;
          }

        return *this;
      }

      ~qrp (void) = default;

      void init (const T&, type = qr<T>::std);

      PermMatrix P (void) const { return p; }

      RV_T Pvec (void) const;

    private:

      PermMatrix p;
    };
  }
}

#endif
