72 lines
4.3 KiB
HTML
72 lines
4.3 KiB
HTML
<!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN'
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'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'>
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<html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'>
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<head>
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<meta http-equiv='Content-Type' content='text/html; charset=utf-8'/>
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<title>integrating boost exception in existing exception class hierarchies</title>
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<link href='reno.css' type='text/css' rel='stylesheet'/>
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</head>
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<body>
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<div class="body-0">
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<div class="body-1">
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<div class="body-2">
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<div>
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<div id="boost_logo">
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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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</div>
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<h1>Boost Exception</h1>
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</div>
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<!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. -->
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<!-- Distributed under the Boost Software License, Version 1.0. (See accompanying -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h2>Integrating Boost Exception in Existing Exception Class Hierarchies</h2>
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</div>
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<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>
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<pre>#include <<span class="RenoLink"><a href="boost_exception_all_hpp.html">boost/exception/all.hpp</a></span>>
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#include <stdexcept>
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typedef boost::<span class="RenoLink"><a href="error_info.html">error_info</a></span><struct tag_std_range_min,size_t> std_range_min;
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typedef boost::<span class="RenoLink"><a href="error_info.html">error_info</a></span><struct tag_std_range_max,size_t> std_range_max;
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typedef boost::<span class="RenoLink"><a href="error_info.html">error_info</a></span><struct tag_std_range_index,size_t> std_range_index;
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template <class T>
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class
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my_container
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{
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public:
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size_t size() const;
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T const &
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operator[]( size_t i ) const
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{
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if( i > size() )
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throw boost::<span class="RenoLink"><a href="enable_error_info.html">enable_error_info</a></span>(std::range_error("Index out of range")) <<
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std_range_min(0) <<
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std_range_max(size()) <<
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std_range_index(i);
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//....
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}
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};
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</pre>
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<p>The call to <span class="RenoLink"><a href="enable_error_info.html">enable_error_info</a></span><T> 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="exception_operator_shl.html">operator<<</a></span> to store additional information in the exception object. The exception can be intercepted as T &, so existing exception handling will not break. It can also be intercepted as boost::<span class="RenoLink"><a href="exception.html">exception</a></span> &, 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>
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</div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div>
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See also: <span class="RenoPageList"><a href="boost-exception.html">Boost Exception</a> | <a href="motivation.html">Motivation</a></span>
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</div>
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<!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. -->
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<!-- Distributed under the Boost Software License, Version 1.0. (See accompanying -->
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<!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) -->
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<div id="footer">
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<p>
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<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>
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<small>Copyright (c) 2006-2009 by Emil Dotchevski and Reverge Studios, Inc.<br/>
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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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</p>
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</div>
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</div>
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</div>
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</div>
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</body>
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</html>
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