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| <a href="http://www.boost.org"><img style="border:0" src="../../../boost.png" alt="Boost" width="277" height="86"/></a> |
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| <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> |
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| <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 --> |
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| <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> |
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