oct-errno.h

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2005-2025 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 ();
 
public:
 
  OCTAVE_DISABLE_COPY_MOVE (octave_errno)
 
  ~octave_errno () = default;
 
  static bool instance_ok ();
 
  static void cleanup_instance ()
  { delete s_instance; s_instance = nullptr; }
 
  static int lookup (const std::string& name);
 
  static octave_scalar_map list ();
 
  static int get () { return errno; }
 
  static int set (int val)
  {
    int retval = errno;
    errno = val;
    return retval;
  }
 
private:
 
  int do_lookup (const std::string& name);
 
  octave_scalar_map do_list ();
 
  //--------
 
  std::map<std::string, int> m_errno_tbl;
 
  static octave_errno *s_instance;
};
 
#endif