ceph/src/boost/libs/exception/example/info_tuple.cpp

   1 //Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc.
   2
   3 //Distributed under the Boost Software License, Version 1.0. (See accompanying
   4 //file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   5
   6 //This example shows how boost::tuple can be used to bundle the
   7 //name of the function that fails together with the reported errno.
   8
   9 #include <boost/exception/info_tuple.hpp>
  10 #include <boost/exception/errinfo_file_name.hpp>
  11 #include <boost/exception/errinfo_api_function.hpp>
  12 #include <boost/exception/errinfo_errno.hpp>
  13 #include <boost/shared_ptr.hpp>
  14 #include <stdio.h>
  15 #include <string>
  16 #include <errno.h>
  17
  18 typedef boost::tuple<boost::errinfo_api_function,boost::errinfo_errno> clib_failure;
  19
  20 struct file_open_error: virtual boost::exception { };
  21
  22 boost::shared_ptr<FILE>
  23 file_open( char const * name, char const * mode )
  24     {
  25     if( FILE * f=fopen(name,mode) )
  26         return boost::shared_ptr<FILE>(f,fclose);
  27     else
  28         throw file_open_error() <<
  29             boost::errinfo_file_name(name) <<
  30             clib_failure("fopen",errno);
  31     }