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<title>exception_ptr</title>
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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"><h3>exception_ptr</h3>
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</div>
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<div class="RenoIncludeDIV"><p><span class="RenoEscape">#<!--<wiki>`#</wiki>--></span>include <<span class="RenoLink"><a href="boost_exception_ptr_hpp.html">boost/exception_ptr.hpp</a></span>></p>
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<pre>namespace
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boost
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{
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<span class="RenoIncludeSPAN"> typedef ---unspecified--- <span class="RenoLink">exception_ptr</span>;</span>
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}</pre>
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</div><p>The <span class="RenoLink">exception_ptr</span> type can be used to refer to a copy of an exception object. It is Default Constructible, Copy Constructible, Assignable and Equality Comparable; <span class="RenoLink">exception_ptr</span>'s operations do not throw.</p>
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<p>The referenced object remains valid at least as long as there is an <span class="RenoLink">exception_ptr</span> object that refers to it.</p>
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<p>Two instances of <span class="RenoLink">exception_ptr</span> are equivalent and compare equal if and only if they refer to the same exception.</p>
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<p>The default constructor of <span class="RenoLink">exception_ptr</span> produces the null value of the type. The null value is equivalent only to itself.</p>
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<h4>Thread safety</h4>
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<div><ul><li> It is legal for multiple threads to hold <span class="RenoLink">exception_ptr</span> references to the same exception object.</li>
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<li> It is illegal for multiple threads to modify the same <span class="RenoLink">exception_ptr</span> object concurrently.</li>
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<li> While calling <span class="RenoLink"><a href="current_exception.html">current_exception</a></span> makes a copy of the current exception object, it is still possible for the two copies to share internal state. Therefore, in general it is not safe to call <span class="RenoLink"><a href="rethrow_exception.html">rethrow_exception</a></span> concurrently to throw the same exception object into multiple threads.</li>
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</ul></div>
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<h4>Nesting of exceptions:</h4>
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<p>An <span class="RenoLink">exception_ptr</span> can be added as <span class="RenoLink"><a href="error_info.html">error_info</a></span> to any boost::<span class="RenoLink"><a href="exception.html">exception</a></span>. This is a convenient way to nest exceptions. There is no limit on the depth of the nesting, however cyclic references result in undefined behavior.</p>
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</div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div>
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<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="boost_exception_ptr_hpp.html">boost/exception_ptr.hpp<br/>
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</a><a href="copy_exception.html">copy_exception<br/>
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</a><a href="current_exception.html">current_exception<br/>
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</a><a href="diagnostic_information.html">diagnostic_information<br/>
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</a><a href="enable_current_exception.html">enable_current_exception<br/>
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</a><a href="frequently_asked_questions.html">Frequently Asked Questions<br/>
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</a><a href="original_exception_type.html">original_exception_type<br/>
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</a><a href="rethrow_exception.html">rethrow_exception<br/>
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</a><a href="unknown_exception.html">unknown_exception<br/>
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</a></div>
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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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<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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