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<h1>Boost Exception</h1>
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<!-- 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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<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&lt;&lt;</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 &lt;<span class="RenoLink"><a href="boost_exception_all_hpp.html">boost/exception/all.hpp</a></span>&gt;
#include &lt;iostream&gt;

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> &amp; e )
        {
        std::cerr &lt;&lt; <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&lt;struct _iobuf&gt; __cdecl my_fopen(const char *,const char *)
Dynamic exception type: class boost::exception_detail::clone_impl&lt;struct fopen_error&gt;
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>
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See also: <span class="RenoPageList"><a href="boost-exception.html">Boost Exception</a></span>
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<small>Copyright (c) 2006-2009 by Emil Dotchevski and Reverge Studios, Inc.<br/>
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