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  26 <a name="boost.contract.specify_except"></a><div class="titlepage"></div>
  27 <div class="refnamediv">
  28 <h2><span class="refentrytitle">Class specify_except</span></h2>
  29 <p>boost::contract::specify_except &#8212; Allow to specify exception guarantees. </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.specify_hpp" title="Header &lt;boost/contract/core/specify.hpp&gt;">boost/contract/core/specify.hpp</a>&gt;
  33
  34 </span>
  35 <span class="keyword">class</span> <a class="link" href="specify_except.html" title="Class specify_except">specify_except</a> <span class="special">{</span>
  36 <span class="keyword">public</span><span class="special">:</span>
  37   <span class="comment">// <a class="link" href="specify_except.html#boost.contract.specify_exceptconstruct-copy-destruct">construct/copy/destruct</a></span>
  38   <a class="link" href="specify_except.html#idm45394999256816-bb"><span class="special">~</span><span class="identifier">specify_except</span></a><span class="special">(</span><span class="special">)</span><span class="special">;</span>
  39
  40   <span class="comment">// <a class="link" href="specify_except.html#idm45394999264384-bb">public member functions</a></span>
  41   <span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> F<span class="special">&gt;</span> <a class="link" href="specify_nothing.html" title="Class specify_nothing">specify_nothing</a> <a class="link" href="specify_except.html#idm45394999263824-bb"><span class="identifier">except</span></a><span class="special">(</span><span class="identifier">F</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  42 <span class="special">}</span><span class="special">;</span></pre></div>
  43 <div class="refsect1">
  44 <a name="idm45707995553584"></a><h2>Description</h2>
  45 <p>Allow to specify the functor this library will call to check exception guarantees. This object is internally constructed by the library when users specify contracts calling <code class="computeroutput"><a class="link" href="function.html" title="Function function">boost::contract::function</a></code> and similar functions (that is why this class does not have a public constructor).</p>
  46 <p><span class="bold"><strong>See Also:</strong></span></p>
  47 <p> <a class="link" href="../../boost_contract/tutorial.html#boost_contract.tutorial.exception_guarantees" title="Exception Guarantees"> Exception Guarantees</a> </p>
  48 <p>
  49 </p>
  50 <p>
  51 </p>
  52 <div class="refsect2">
  53 <a name="idm45707995549152"></a><h3>
  54 <a name="boost.contract.specify_exceptconstruct-copy-destruct"></a><code class="computeroutput">specify_except</code>
  55         public
  56        construct/copy/destruct</h3>
  57 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  58 <pre class="literallayout"><a name="idm45394999256816-bb"></a><span class="special">~</span><span class="identifier">specify_except</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre>Destruct this object. <p><span class="bold"><strong>Throws:</strong></span> This is declared <code class="computeroutput">noexcept(false)</code> since C++11 to allow users to program failure handlers that throw exceptions on contract assertion failures (not the default, see  <a class="link" href="../../boost_contract/advanced.html#boost_contract.advanced.throw_on_failures__and__noexcept__" title="Throw on Failures (and noexcept)">
  59             Throw on Failure</a>). </p>
  60 </li></ol></div>
  61 </div>
  62 <div class="refsect2">
  63 <a name="idm45707995539920"></a><h3>
  64 <a name="idm45394999264384-bb"></a><code class="computeroutput">specify_except</code> public member functions</h3>
  65 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  66 <pre class="literallayout"><span class="keyword">template</span><span class="special">&lt;</span><span class="keyword">typename</span> F<span class="special">&gt;</span> <a class="link" href="specify_nothing.html" title="Class specify_nothing">specify_nothing</a> <a name="idm45394999263824-bb"></a><span class="identifier">except</span><span class="special">(</span><span class="identifier">F</span> <span class="keyword">const</span> <span class="special">&amp;</span> f<span class="special">)</span><span class="special">;</span></pre>Allow to specify exception guarantees. <p>
  67
  68 </p>
  69 <div class="variablelist"><table border="0" class="variablelist compact">
  70 <colgroup>
  71 <col align="left" valign="top">
  72 <col>
  73 </colgroup>
  74 <tbody>
  75 <tr>
  76 <td><p><span class="term">Parameters:</span></p></td>
  77 <td><div class="variablelist"><table border="0" class="variablelist compact">
  78 <colgroup>
  79 <col align="left" valign="top">
  80 <col>
  81 </colgroup>
  82 <tbody><tr>
  83 <td><p><span class="term"><code class="computeroutput">f</code></span></p></td>
  84 <td><p>Nullary functor called by this library to check exception guarantees <code class="computeroutput">f()</code>. Assertions within this functor are usually programmed using  <code class="computeroutput"><code class="computeroutput"><a class="link" href="../../BOOST_CONTRACT_ASSERT.html" title="Macro BOOST_CONTRACT_ASSERT">BOOST_CONTRACT_ASSERT</a></code></code>, but any exception thrown by a call to this functor indicates a contract assertion failure (and will result in this library calling  <code class="computeroutput"><code class="computeroutput"><a class="link" href="except_failure.html" title="Function except_failure">boost::contract::except_failure</a></code></code>). This functor should capture variables by (constant) references (to access the values they will have at function exit).</p></td>
  85 </tr></tbody>
  86 </table></div></td>
  87 </tr>
  88 <tr>
  89 <td><p><span class="term">Returns:</span></p></td>
  90 <td><p>After exception guarantees have been specified, the object returned by this function does not allow to specify any additional contract. </p></td>
  91 </tr>
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  93 </table></div>
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