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more/diag/errno.h

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00001 //  more/errno.h -- a C++ally correct errno
00002 //  Copyright (C) 2001  Petter Urkedal (petter.urkedal@matfys.lth.se)
00003 //
00004 //  This file is free software; you can redistribute it and/or modify
00005 //  it under the terms of the GNU General Public License as published by
00006 //  the Free Software Foundation; either version 2 of the License, or
00007 //  (at your option) any later version.
00008 //
00009 //  This file is distributed in the hope that it will be useful,
00010 //  but WITHOUT ANY WARRANTY; without even the implied warranty of
00011 //  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00012 //  GNU General Public License for more details.
00013 //
00014 //  You should have received a copy of the GNU General Public License
00015 //  along with this program; if not, write to the Free Software
00016 //  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00017 //
00018 //  As a special exception, you may use this file as part of a free
00019 //  software library without restriction.  Specifically, if other files
00020 //  instantiate templates or use macros or inline functions from this
00021 //  file, or you compile this file and link it with other files to
00022 //  produce an executable, this file does not by itself cause the
00023 //  resulting executable to be covered by the GNU General Public
00024 //  License.  This exception does not however invalidate any other
00025 //  reasons why the executable file might be covered by the GNU General
00026 //  Public License.
00027 //
00028 //  $Id: errno.h,v 1.1 2002/05/30 18:01:37 petter_urkedal Exp $
00029 
00030 
00031 #ifndef MORE_DIAG_ERRNO_H
00032 #define MORE_DIAG_ERRNO_H
00033 
00034 #include <stdexcept>
00035 
00036 namespace more {
00037 namespace diag {
00038 
00039   /** Return the value of errno. */
00040   int the_errno();
00041 
00042   /** Equivalent to strerror(the_errno()). */
00043   char const* strerror();
00044   /** Equivalent to std::strerror(err). */
00045   char const* strerror(int err);
00046 
00047   /** An exception used to report an errno condition. */
00048   struct errno_exception : std::runtime_error
00049   {
00050       /** An exception with the last errno condition. The base class
00051           is constructed with the corresponding strerror string. */
00052       errno_exception();
00053 
00054       /** Same as errno_exception(), except adds a prefix and a
00055           separator ": " to the message. */
00056       explicit errno_exception(std::string);
00057 
00058       /** An exception with a given errno condition. The base class is
00059           constructed with the corresponding strerror string. */
00060       explicit errno_exception(int);
00061 
00062       /** Same as errno_exception(int), except adds a prefix and a
00063           separator ": " to the message. */
00064       explicit errno_exception(int, std::string);
00065 
00066       /** Return the errno of this exception. */
00067       int the_errno() const { return n; }
00068 
00069     private:
00070       int n;
00071   };
00072 
00073 }} // more::diag
00074 
00075 #endif

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