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[SVN r47250]
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Emil Dotchevski
2008-07-09 00:18:09 +00:00
parent 044d5767e2
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doc/tutorial_diagnostic_information.html
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<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>Tutorial: Diagnostic Information</title>
<title>tutorial: diagnostic information</title>
<link href='reno.css' type='text/css' rel='stylesheet'/>
</head>
<body>
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<!-- Copyright (c) 2006-2008 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"><h2>Diagnostic Information</h2>
<div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h2>Tutorial: Diagnostic Information</h2>
</div>
<p>Class boost::<span class="RenoLink"><a href="exception.html">exception</a></span> provides a virtual member function <span class="RenoLink"><a href="exception_diagnostic_information.html">diagnostic_information</a></span>, with a signature similar to the familiar std::exception::what function. The default implementation returns a string value that 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="exception_hpp.html">boost/exception.hpp</a></span>&gt;
#include &lt;iostream&gt;
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}
}</pre>
<p>The <span class="RenoLink"><a href="exception_diagnostic_information.html">diagnostic_information</a></span> member function iterates over all data objects stored in the boost::<span class="RenoLink"><a href="exception.html">exception</a></span> through <span class="RenoLink"><a href="operator_shl_exception.html">operator&lt;&lt;</a></span>. The returned string is constructed by converting each data object to string and then concatenating these strings together.</p>
<p>When the <span class="RenoLink"><a href="error_info.html">error_info</a></span>&lt;Tag,T&gt; template is instantiated, the system attempts overload resolution for an unqualified call to to_string(x), where x is of type T. If this is successful, the to_string overload is used to convert objects of type T to string.</p>
<p>When the <span class="RenoLink"><a href="error_info.html">error_info</a></span>&lt;Tag,T&gt; template is instantiated, the system attempts overload resolution for an unqualified call to to_string(x), where x is of type T. If this is successful, the to_string overload is expected to return std::string and is used to convert objects of type T to string.</p>
<p>Otherwise, the system attempts overload resolution for s &lt;&lt; x, where s is a std::ostringstream and x is of type T. If this is successful, the operator&lt;&lt; overload is used to convert objects of type T to string.</p>
<p>Otherwise the system is unable to convert objects of type T to string, and an unspecified stub string value is used without issuing a compile error.</p>
</div><h3>See also:</h3>
</div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div>
<h3>See Also:</h3>
<div class="RenoPageList"><a href="boost-exception.html">Boost Exception<br/>
</a><a href="exception_diagnostic_information.html">exception::diagnostic_information<br/>
</a></div>
</div>
<!-- Copyright (c) 2006-2008 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) -->