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[SVN r47250]
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Emil Dotchevski
2008-07-09 00:18:09 +00:00
parent 044d5767e2
commit d7722921a7
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doc/tutorial_enable_error_info.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: Integrating Boost Exception in Existing Exception Class Hierarchies</title>
<title>tutorial: integrating boost exception in existing exception class hierarchies</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>Integrating Boost Exception in Existing Exception Class Hierarchies</h2>
<p>Some exception hierarchies can not be modified to make boost::<span class="RenoLink"><a href="exception.html">exception</a></span> a base type. For this case, the <span class="RenoLink"><a href="enable_error_info.html">enable_error_info</a></span> function template can be used to make exception objects derive from boost::<span class="RenoLink"><a href="exception.html">exception</a></span> anyway. Here is an example:</p>
<div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h2>Tutorial: Integrating Boost Exception in Existing Exception Class Hierarchies</h2>
</div>
<p>Some exception hierarchies can not be modified to make boost::<span class="RenoLink"><a href="exception.html">exception</a></span> a base type. In this case, the <span class="RenoLink"><a href="enable_error_info.html">enable_error_info</a></span> function template can be used to make exception objects derive from boost::<span class="RenoLink"><a href="exception.html">exception</a></span> anyway. Here is an example:</p>
<pre>#include &lt;<span class="RenoLink"><a href="exception_hpp.html">boost/exception.hpp</a></span>&gt;
#include &lt;stdexcept&gt;
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};
</pre>
<p>The call to <span class="RenoLink"><a href="enable_error_info.html">enable_error_info</a></span>&lt;T&gt; gets us an object of <i>unspecified type</i> which is guaranteed to derive from both boost::<span class="RenoLink"><a href="exception.html">exception</a></span> and T. This makes it possible to use <span class="RenoLink"><a href="operator_shl_exception.html">operator&lt;&lt;</a></span> to store additional information in the exception object. The exception can be intercepted as T &amp;, so existing exception handling will not break. It can also be intercepted as boost::<span class="RenoLink"><a href="exception.html">exception</a></span> &amp;, so that <span class="RenoLink"><a href="tutorial_transporting_data.html">more information can be added to the exception at a later time</a></span>.</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></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) -->