projects / ceph.git / blame
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| 7c673cae FG |
1 | <!DOCTYPE html PUBLIC '-//W3C//DTD XHTML 1.0 Strict//EN' |
| 2 | 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd'> | |
| 3 | <html xmlns='http://www.w3.org/1999/xhtml' xml:lang='en' lang='en'> | |
| 4 | <head> | |
| 5 | <meta http-equiv='Content-Type' content='text/html; charset=utf-8'/> | |
| 6 | <title>current_exception</title> | |
| 7 | <link href='reno.css' type='text/css' rel='stylesheet'/> | |
| 8 | </head> | |
| 9 | <body> | |
| 10 | <div class="body-0"> | |
| 11 | <div class="body-1"> | |
| 12 | <div class="body-2"> | |
| 13 | <div> | |
| 14 | <div id="boost_logo"> | |
| 15 | <a href="http://www.boost.org"><img style="border:0" src="../../../boost.png" alt="Boost" width="277" height="86"/></a> | |
| 16 | </div> | |
| 17 | <h1>Boost Exception</h1> | |
| 18 | </div> | |
| 19 | <!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. --> | |
| 20 | <!-- Distributed under the Boost Software License, Version 1.0. (See accompanying --> | |
| 21 | <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> | |
| 22 | <div class="RenoIncludeDIV"><div class="RenoAutoDIV"><h3>current_exception</h3> | |
| 23 | </div> | |
| 24 | <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> | |
| 25 | <pre>namespace | |
| 26 | boost | |
| 27 | { | |
| 28 | <span class="RenoIncludeSPAN"> <span class="RenoLink"><a href="exception_ptr.html">exception_ptr</a></span> <span class="RenoLink">current_exception</span>();</span> | |
| 29 | }</pre> | |
| 30 | </div><h4>Requirements:</h4> | |
| 31 | <p>The <span class="RenoLink">current_exception</span> function must not be called outside of a catch block.</p> | |
| 32 | <p>In addition, to safely copy an exception from one thread to another, if the exception object is copied by <span class="RenoLink">current_exception</span> or <span class="RenoLink"><a href="copy_exception.html">copy_exception</a></span>, the two copies must not have shared state. Exceptions that have value-type semantics (as well as the boost::<span class="RenoLink"><a href="exception.html">exception</a></span> type itself) satisfy this requirement.</p> | |
| 33 | <h4>Returns:</h4> | |
| 34 | <div><ul><li> An <span class="RenoLink"><a href="exception_ptr.html">exception_ptr</a></span> that refers to the currently handled exception or a copy of the currently handled exception.</li> | |
| 35 | <li> If the function needs to allocate memory and the attempt fails, it returns an <span class="RenoLink"><a href="exception_ptr.html">exception_ptr</a></span> that refers to an instance of std::bad_alloc.</li> | |
| 36 | </ul></div> | |
| 37 | <h4>Throws:</h4> | |
| 38 | <p>Nothing.</p> | |
| 39 | <h4>Notes:</h4> | |
| 40 | <div><ul><li> It is unspecified whether the return values of two successive calls to <span class="RenoLink">current_exception</span> refer to the same exception object.</li> | |
| 41 | <li> Correct implementation of <span class="RenoLink">current_exception</span> may require compiler support, unless <span class="RenoLink"><a href="enable_current_exception.html">enable_current_exception</a></span> was used at the time the currently handled exception object was passed to throw. Whenever <span class="RenoLink">current_exception</span> fails to properly copy the current exception object, it returns an <span class="RenoLink"><a href="exception_ptr.html">exception_ptr</a></span> to an object of type that is as close as possible to the original exception type, using <span class="RenoLink"><a href="unknown_exception.html">unknown_exception</a></span> as a final fallback. All such types derive from boost::<span class="RenoLink"><a href="exception.html">exception</a></span>, and:<div><ul><li> if the original exception object derives from boost::<span class="RenoLink"><a href="exception.html">exception</a></span>, then the boost::<span class="RenoLink"><a href="exception.html">exception</a></span> sub-object of the object referred to by the returned <span class="RenoLink"><a href="exception_ptr.html">exception_ptr</a></span> is initialized by the boost::<span class="RenoLink"><a href="exception.html">exception</a></span> copy constructor;</li> | |
| 42 | <li> if available, the exception contains the std::type_info of the original exception object, accessible through <span class="RenoLink"><a href="get_error_info.html">get_error_info</a></span><<span class="RenoLink"><a href="original_exception_type.html">original_exception_type</a></span>>.</li> | |
| 43 | </ul></div> | |
| 44 | </li> | |
| 45 | </ul></div> | |
| 46 | </div><div class="RenoAutoDIV"><div class="RenoHR"><hr/></div> | |
| 47 | See also: <span class="RenoPageList"><a href="boost-exception.html">Boost Exception</a> | <a href="boost_exception_ptr_hpp.html">boost/exception_ptr.hpp</a> | <a href="copy_exception.html">copy_exception</a> | <a href="enable_current_exception.html">enable_current_exception</a> | <a href="frequently_asked_questions.html">Frequently Asked Questions</a> | <a href="original_exception_type.html">original_exception_type</a> | <a href="unknown_exception.html">unknown_exception</a></span> | |
| 48 | </div> | |
| 49 | <!-- Copyright (c) 2006-2009 Emil Dotchevski and Reverge Studios, Inc. --> | |
| 50 | <!-- Distributed under the Boost Software License, Version 1.0. (See accompanying --> | |
| 51 | <!-- file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) --> | |
| 52 | <div id="footer"> | |
| 53 | <p> | |
| 54 | <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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| 56 | <small>Copyright (c) 2006-2009 by Emil Dotchevski and Reverge Studios, Inc.<br/> | |
| 57 | Distributed under the <a href="http://www.boost.org/LICENSE_1_0.txt">Boost Software License, Version 1.0</a>.</small> | |
| 58 | </p> | |
| 59 | </div> | |
| 60 | </div> | |
| 61 | </div> | |
| 62 | </div> | |
| 63 | </body> | |
| 64 | </html> |