////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2005-2021 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_oct_errno_h)
#define octave_oct_errno_h 1

#include "octave-config.h"

#include <cerrno>
#include <map>
#include <string>

#include "oct-map.h"

class
octave_errno
{
protected:

  octave_errno (void);

public:

  ~octave_errno (void) = default;

  static bool instance_ok (void);

  static void cleanup_instance (void) { delete instance; instance = nullptr; }

  static int lookup (const std::string& name);

  static octave_scalar_map list (void);

  static int get (void) { return errno; }

  static int set (int val)
  {
    int retval = errno;
    errno = val;
    return retval;
  }

private:

  std::map<std::string, int> errno_tbl;

  static octave_errno *instance;

  int do_lookup (const std::string& name);

  octave_scalar_map do_list (void);
};

#endif
