////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2002-2021 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/>.
//
////////////////////////////////////////////////////////////////////////

#if ! defined (octave_base_list_h)
#define octave_base_list_h 1

#include "octave-config.h"

#include <cstdlib>

#include <list>

namespace octave
{
  template <typename elt_type>
  class
  base_list
  {
  public:

    typedef typename std::list<elt_type>::iterator iterator;
    typedef typename std::list<elt_type>::const_iterator const_iterator;

    typedef typename std::list<elt_type>::reverse_iterator reverse_iterator;
    typedef typename std::list<elt_type>::const_reverse_iterator
      const_reverse_iterator;

    bool empty (void) const { return m_lst.empty (); }

    std::size_t size (void) const { return m_lst.size (); }
    std::size_t length (void) const { return size (); }

    iterator erase (iterator pos) { return m_lst.erase (pos); }

    template <typename P>
    void remove_if (P pred)
    {
      m_lst.remove_if (pred);
    }

    void clear (void) { m_lst.clear (); }

    iterator begin (void) { return iterator (m_lst.begin ()); }
    const_iterator begin (void) const { return const_iterator (m_lst.begin ()); }

    iterator end (void) { return iterator (m_lst.end ()); }
    const_iterator end (void) const { return const_iterator (m_lst.end ()); }

    reverse_iterator rbegin (void) { return reverse_iterator (m_lst.rbegin ()); }
    const_reverse_iterator rbegin (void) const
    { return const_reverse_iterator (m_lst.rbegin ()); }

    reverse_iterator rend (void) { return reverse_iterator (m_lst.rend ()); }
    const_reverse_iterator rend (void) const
    { return const_reverse_iterator (m_lst.rend ()); }

    elt_type& front (void) { return m_lst.front (); }
    elt_type& back (void) { return m_lst.back (); }

    const elt_type& front (void) const { return m_lst.front (); }
    const elt_type& back (void) const { return m_lst.back (); }

    void push_front (const elt_type& s) { m_lst.push_front (s); }
    void push_back (const elt_type& s) { m_lst.push_back (s); }

    void pop_front (void) { m_lst.pop_front (); }
    void pop_back (void) { m_lst.pop_back (); }

    // For backward compatibility.
    void append (const elt_type& s) { m_lst.push_back (s); }

    base_list (void) = default;

    base_list (const std::list<elt_type>& l) : m_lst (l) { }

    base_list (const base_list& bl) = default;

    base_list& operator = (const base_list& bl) = default;

    virtual ~base_list (void) = default;

  protected:

    std::list<elt_type> m_lst;
  };
}

#endif
