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  28 <h2><span class="refentrytitle">Function old_failure</span></h2>
  29 <p>boost::contract::old_failure &#8212; Call failure handler for old values copied at body. </p>
  30 </div>
  31 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  32 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../reference.html#header.boost.contract.core.exception_hpp" title="Header &lt;boost/contract/core/exception.hpp&gt;">boost/contract/core/exception.hpp</a>&gt;
  33
  34 </span>
  35 <span class="keyword">void</span> <span class="identifier">old_failure</span><span class="special">(</span><span class="identifier">from</span> where<span class="special">)</span><span class="special">;</span></pre></div>
  36 <div class="refsect1">
  37 <a name="idm45707995751120"></a><h2>Description</h2>
  38 <p>This is often called only internally by this library.</p>
  39 <p><span class="bold"><strong>Throws:</strong></span> This can throw in case programmers specify a failure handler that throws exceptions on contract assertion failures (not the default).</p>
  40 <p>
  41 </p>
  42 <p><span class="bold"><strong>See Also:</strong></span></p>
  43 <p> <a class="link" href="../../boost_contract/advanced.html#boost_contract.advanced.throw_on_failures__and__noexcept__" title="Throw on Failures (and noexcept)"> Throw on Failure</a>,  <a class="link" href="../../boost_contract/advanced.html#boost_contract.advanced.old_values_copied_at_body" title="Old Values Copied at Body"> Old Values Copied at Body</a> </p>
  44 <p>
  45 </p>
  46 <p>
  47 </p>
  48 <div class="variablelist"><table border="0" class="variablelist compact">
  49 <colgroup>
  50 <col align="left" valign="top">
  51 <col>
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  53 <tbody><tr>
  54 <td><p><span class="term">Parameters:</span></p></td>
  55 <td><div class="variablelist"><table border="0" class="variablelist compact">
  56 <colgroup>
  57 <col align="left" valign="top">
  58 <col>
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  60 <tbody><tr>
  61 <td><p><span class="term"><code class="computeroutput">where</code></span></p></td>
  62 <td><p>Operation that failed the old value copy (e.g., this might be useful to program failure handler functors that never throw from destructors, not even when they are programmed by users to throw exceptions instead of terminating the program).</p></td>
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  70 <td align="left"></td>
  71 <td align="right"><div class="copyright-footer">Copyright &#169; 2008-2019 Lorenzo Caminiti<p>
  72         Distributed under the Boost Software License, Version 1.0 (see accompanying
  73         file LICENSE_1_0.txt or a copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
  74       </p>
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