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more/diag/errno.h

Go to the documentation of this file.

//  more/errno.h -- a C++ally correct errno
//  Copyright (C) 2001  Petter Urkedal (petter.urkedal@matfys.lth.se)
//
//  This file 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 2 of the License, or
//  (at your option) any later version.
//
//  This file 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 this program; if not, write to the Free Software
//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
//
//  As a special exception, you may use this file as part of a free
//  software library without restriction.  Specifically, if other files
//  instantiate templates or use macros or inline functions from this
//  file, or you compile this file and link it with other files to
//  produce an executable, this file does not by itself cause the
//  resulting executable to be covered by the GNU General Public
//  License.  This exception does not however invalidate any other
//  reasons why the executable file might be covered by the GNU General
//  Public License.
//
//  $Id: errno.h,v 1.1 2002/05/30 18:01:37 petter_urkedal Exp $


#ifndef MORE_DIAG_ERRNO_H
#define MORE_DIAG_ERRNO_H

#include <stdexcept>

namespace more {
namespace diag {

  /** Return the value of errno. */
  int the_errno();

  /** Equivalent to strerror(the_errno()). */
  char const* strerror();
  /** Equivalent to std::strerror(err). */
  char const* strerror(int err);

  /** An exception used to report an errno condition. */
  struct errno_exception : std::runtime_error
  {
      /** An exception with the last errno condition. The base class
          is constructed with the corresponding strerror string. */
      errno_exception();

      /** Same as errno_exception(), except adds a prefix and a
          separator ": " to the message. */
      explicit errno_exception(std::string);

      /** An exception with a given errno condition. The base class is
          constructed with the corresponding strerror string. */
      explicit errno_exception(int);

      /** Same as errno_exception(int), except adds a prefix and a
          separator ": " to the message. */
      explicit errno_exception(int, std::string);

      /** Return the errno of this exception. */
      int the_errno() const { return n; }

    private:
      int n;
  };

}} // more::diag

#endif

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