<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN' 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'> <html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'> <head> <meta http-equiv='Content-Type' content='text/html; charset=utf-8'/> <title>diagnostic information</title> <link href='reno.css' type='text/css' rel='stylesheet'/> </head> <body> <div class="body-0"> <div class="body-1"> <div class="body-2"> <div> <div id="boost_logo"> <a href="http://www.boost.org"><img style="border:0" src="../../../boost.png" alt="Boost" width="277" height="86"/></a> </div> <h1>Boost Exception</h1> </div> <!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. --> <!-- Distributed under the Boost Software License, Version 1.0. (See accompanying --> <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> <div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h2>Diagnostic Information</h2> </div> <p>Boost Exception provides a namespace-scope function <span class="RenoLink"><a href="diagnostic_information.html">diagnostic_information</a></span> which takes a boost::<span class="RenoLink"><a href="exception.html">exception</a></span>. The returned string contains:</p> <div><ul><li>the string representation of all data objects added to the boost::<span class="RenoLink"><a href="exception.html">exception</a></span> through <span class="RenoLink"><a href="exception_operator_shl.html">operator<<</a></span>;</li> <li>the output from std::exception::what;</li> <li>additional platform-specific diagnostic information.</li> </ul></div> <p>The returned string is not presentable as a friendly user message, but because it is generated automatically, it is useful for debugging or logging purposes. Here is an example:</p> <pre>#include <<span class="RenoLink"><a href="boost_exception_all_hpp.html">boost/exception/all.hpp</a></span>> #include <iostream> void f(); //throws unknown types that derive from boost::<span class="RenoLink"><a href="exception.html">exception</a></span>. void g() { try { f(); } catch( boost::<span class="RenoLink"><a href="exception.html">exception</a></span> & e ) { std::cerr << <span class="RenoLink"><a href="diagnostic_information.html">diagnostic_information</a></span>(e); } }</pre> <div class="RenoIncludeDIV"><h4>Example:</h4> <p>this is a possible output from the <span class="RenoLink"><a href="diagnostic_information.html">diagnostic_information</a></span> function, as used in <i>libs/exception/example/example_io.cpp:</i></p> <pre>example_io.cpp(70): Throw in function class boost::shared_ptr<struct _iobuf> __cdecl my_fopen(const char *,const char *) Dynamic exception type: class boost::exception_detail::clone_impl<struct fopen_error> std::exception::what: example_io error [struct boost::<span class="RenoLink"><a href="errinfo_api_function.html">errinfo_api_function</a></span>_ *] = fopen [struct boost::<span class="RenoLink"><a href="errinfo_errno.html">errinfo_errno</a></span>_ *] = 2, "No such file or directory" [struct boost::<span class="RenoLink"><a href="errinfo_file_name.html">errinfo_file_name</a></span>_ *] = tmp1.txt [struct boost::<span class="RenoLink"><a href="errinfo_file_open_mode.html">errinfo_file_open_mode</a></span>_ *] = rb</pre> </div></div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div> See also: <span class="RenoPageList"><a href="boost-exception.html">Boost Exception</a></span> </div> <!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. --> <!-- Distributed under the Boost Software License, Version 1.0. (See accompanying --> <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> <div id="footer"> <p> <a class="logo" href="http://jigsaw.w3.org/css-validator/check/referer"><img class="logo_pic" src="valid-css.png" alt="Valid CSS" height="31" width="88"/></a> <a class="logo" href="http://validator.w3.org/check?uri=referer"><img class="logo_pic" src="valid-xhtml.png" alt="Valid XHTML 1.0" height="31" width="88"/></a> <small>Copyright (c) 2006-2009 by Emil Dotchevski and Reverge Studios, Inc.<br/> Distributed under the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Version 1.0</a>.</small> </p> </div> </div> </div> </div> </body> </html>