ceph/src/boost/libs/exception/test/N3757_test.cpp

   1 //Copyright (c) 2006-2013 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 file tests the N3757 syntax for adding error info to std::exception, which is
   7 //different from the syntax used by Boost Exception.
   8
   9 #include <boost/exception/N3757.hpp>
  10 #include <boost/exception/diagnostic_information.hpp>
  11 #include <boost/detail/lightweight_test.hpp>
  12 #include <ostream>
  13
  14 struct tag1 { typedef int type; };
  15 struct tag2 { typedef std::string type; };
  16 struct tag3 { typedef int type; };
  17
  18 struct my_error_code { int ec; my_error_code(int ec):ec(ec){ } };
  19 struct tag_error_code { typedef my_error_code type; };
  20
  21 bool my_error_code_to_string_called=false;
  22
  23 std::ostream &
  24 operator<<( std::ostream & s, my_error_code const & x )
  25 {
  26     my_error_code_to_string_called=true;
  27     return s << "my_error_code(" << x.ec << ')';
  28 }
  29
  30 struct my_exception: virtual std::exception, virtual boost::exception { };
  31
  32 int
  33 main()
  34     {
  35     try
  36         {
  37         throw my_exception();
  38         }
  39     catch(
  40         boost::exception & e )
  41         {
  42         e.set<tag1>(42);
  43         e.set<tag2>("42");
  44         e.set<tag_error_code>(42); //Implicit conversion
  45         try
  46             {
  47             throw;
  48             }
  49         catch(
  50         my_exception & e )
  51             {
  52             BOOST_TEST(e.get<tag1>() && *e.get<tag1>()==42);
  53             BOOST_TEST(e.get<tag2>() && *e.get<tag2>()=="42");
  54             BOOST_TEST(!e.get<tag3>());
  55             BOOST_TEST(e.get<tag_error_code>() && e.get<tag_error_code>()->ec==42);
  56
  57             //Below we're verifying that an error code wrapped in a user-defined type
  58             //invokes the correct op<< to convert the error code to string.
  59             //Note that N3757 diagnostic_information uses different syntax, it is a
  60             //member of of std::exception.
  61             std::string di=boost::diagnostic_information(e);
  62             BOOST_TEST(!di.empty());
  63             BOOST_TEST(my_error_code_to_string_called);
  64             }
  65         }
  66     return boost::report_errors();
  67     }