forked from boostorg/exception
a1c08eb8e0
In other libraries, watch for compile error referring to throw_exception_assert_compatibility in boost::throw_exception. Resolve by throwing an exception that derives from std::exception. This is not a new requirement but it is being enforced now. [SVN r46818]
68 lines
4.2 KiB
HTML
68 lines
4.2 KiB
HTML
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<title>Tutorial: Diagnostic Information</title>
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<a href="http://www.boost.org"><img style="border:0" src="http://www.boost.org/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) 2006-2008 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"><h2>Diagnostic Information</h2>
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<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>
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<pre>#include <<span class="RenoLink"><a href="exception_hpp.html">boost/exception.hpp</a></span>>
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#include <iostream>
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void f(); //throws unknown types that derive from boost::<span class="RenoLink"><a href="exception.html">exception</a></span>.
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void
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g()
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{
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try
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{
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f();
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}
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catch(
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boost::<span class="RenoLink"><a href="exception.html">exception</a></span> & e )
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{
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std::cerr << e.<span class="RenoLink"><a href="exception_diagnostic_information.html">diagnostic_information</a></span>();
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}
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}</pre>
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<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<<</a></span>. The returned string is constructed by converting each data object to string and then concatenating these strings together.</p>
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<p>When the <span class="RenoLink"><a href="error_info.html">error_info</a></span><Tag,T> 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>
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<p>Otherwise, the system attempts overload resolution for s << x, where s is a std::ostringstream and x is of type T. If this is successful, the operator<< overload is used to convert objects of type T to string.</p>
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<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>
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</div><h3>See also:</h3>
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<div class="RenoPageList"><a href="boost-exception.html">Boost Exception<br/>
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</a><a href="exception_diagnostic_information.html">exception::diagnostic_information<br/>
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</a></div>
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<!-- Copyright (c) 2006-2008 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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<small>Copyright (c) 2006-2008 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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