boost/boost/exception/get_error_info.hpp

   1 //Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc.\r
   2 \r
   3 //Distributed under the Boost Software License, Version 1.0. (See accompanying\r
   4 //file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)\r
   5 \r
   6 #ifndef UUID_1A590226753311DD9E4CCF6156D89593\r
   7 #define UUID_1A590226753311DD9E4CCF6156D89593\r
   8 \r
   9 #include <boost/exception/exception.hpp>\r
  10 #include <boost/exception/detail/error_info_impl.hpp>\r
  11 #include <boost/exception/detail/type_info.hpp>\r
  12 #include <boost/shared_ptr.hpp>\r
  13 \r
  14 namespace\r
  15 boost\r
  16     {\r
  17     namespace\r
  18     exception_detail\r
  19         {\r
  20         template <class ErrorInfo>\r
  21         struct\r
  22         get_info\r
  23             {\r
  24             static\r
  25             typename ErrorInfo::value_type const *\r
  26             get( exception const & x )\r
  27                 {\r
  28                 if( exception_detail::error_info_container * c=x.data_.get() )\r
  29                     if( shared_ptr<exception_detail::error_info_base const> eib = c->get(BOOST_EXCEPTION_STATIC_TYPEID(ErrorInfo)) )\r
  30                         {\r
  31 #ifndef BOOST_NO_RTTI\r
  32                         BOOST_ASSERT( 0!=dynamic_cast<ErrorInfo const *>(eib.get()) );\r
  33 #endif\r
  34                         ErrorInfo const * w = static_cast<ErrorInfo const *>(eib.get());\r
  35                         return &w->value();\r
  36                         }\r
  37                 return 0;\r
  38                 }\r
  39             };\r
  40 \r
  41         template <>\r
  42         struct\r
  43         get_info<throw_function>\r
  44             {\r
  45             static\r
  46             char const * const *\r
  47             get( exception const & x )\r
  48                 {\r
  49                 return x.throw_function_ ? &x.throw_function_ : 0;\r
  50                 }\r
  51             };\r
  52 \r
  53         template <>\r
  54         struct\r
  55         get_info<throw_file>\r
  56             {\r
  57             static\r
  58             char const * const *\r
  59             get( exception const & x )\r
  60                 {\r
  61                 return x.throw_file_ ? &x.throw_file_ : 0;\r
  62                 }\r
  63             };\r
  64 \r
  65         template <>\r
  66         struct\r
  67         get_info<throw_line>\r
  68             {\r
  69             static\r
  70             int const *\r
  71             get( exception const & x )\r
  72                 {\r
  73                 return x.throw_line_!=-1 ? &x.throw_line_ : 0;\r
  74                 }\r
  75             };\r
  76         }\r
  77 \r
  78 #ifdef BOOST_NO_RTTI\r
  79     template <class ErrorInfo>\r
  80     inline\r
  81     typename ErrorInfo::value_type const *\r
  82     get_error_info( boost::exception const & x )\r
  83         {\r
  84         return exception_detail::get_info<ErrorInfo>::get(x);\r
  85         }\r
  86 #else\r
  87     template <class ErrorInfo,class E>\r
  88     inline\r
  89     typename ErrorInfo::value_type const *\r
  90     get_error_info( E const & some_exception )\r
  91         {\r
  92         if( exception const * x = dynamic_cast<exception const *>(&some_exception) )\r
  93             return exception_detail::get_info<ErrorInfo>::get(*x);\r
  94         else\r
  95             return 0;\r
  96         }\r
  97 #endif\r
  98     }\r
  99 \r
 100 #endif\r