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  28 <h2><span class="refentrytitle">Macro BOOST_CONTRACT_ASSERT_AUDIT</span></h2>
  29 <p>BOOST_CONTRACT_ASSERT_AUDIT &#8212; Preferred way to assert contract conditions that are computationally expensive, at least compared to the computational cost of executing the function body. </p>
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  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.assert_hpp" title="Header &lt;boost/contract/assert.hpp&gt;">boost/contract/assert.hpp</a>&gt;
  33
  34 </span>BOOST_CONTRACT_ASSERT_AUDIT(cond)</pre></div>
  35 <div class="refsect1">
  36 <a name="idm45707998472192"></a><h2>Description</h2>
  37 <p>The asserted condition will always be compiled and validated syntactically, but it will not be checked at run-time unless  <code class="computeroutput"><a class="link" href="BOOST_CONTRACT_AUDITS.html" title="Macro BOOST_CONTRACT_AUDITS">BOOST_CONTRACT_AUDITS</a></code> is defined (undefined by default). This macro is defined by code equivalent to:</p>
  38 <pre class="programlisting"><span class="preprocessor">#ifdef</span> <span class="identifier">BOOST_CONTRACT_AUDITS</span>
  39     <span class="preprocessor">#define</span> <span class="identifier">BOOST_CONTRACT_ASSERT_AUDIT</span><span class="special">(</span><span class="identifier">cond</span><span class="special">)</span> \
  40         <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="identifier">cond</span><span class="special">)</span>
  41 <span class="preprocessor">#else</span>
  42     <span class="preprocessor">#define</span> <span class="identifier">BOOST_CONTRACT_ASSERT_AUDIT</span><span class="special">(</span><span class="identifier">cond</span><span class="special">)</span> \
  43         <span class="identifier">BOOST_CONTRACT_ASSERT</span><span class="special">(</span><span class="keyword">true</span> <span class="special">||</span> <span class="identifier">cond</span><span class="special">)</span>
  44 <span class="preprocessor">#endif</span>
  45 </pre>
  46 <p> <code class="computeroutput"><a class="link" href="BOOST_CONTRACT_ASSERT.html" title="Macro BOOST_CONTRACT_ASSERT">BOOST_CONTRACT_ASSERT</a></code>, <code class="computeroutput"><a class="link" href="BOOST_CO_idm45395000817520.html" title="Macro BOOST_CONTRACT_ASSERT_AUDIT">BOOST_CONTRACT_ASSERT_AUDIT</a></code>, and <code class="computeroutput"><a class="link" href="BOOST_CO_idm45395027441616.html" title="Macro BOOST_CONTRACT_ASSERT_AXIOM">BOOST_CONTRACT_ASSERT_AXIOM</a></code> are the three assertion levels predefined by this library. If there is a need, programmers are free to implement their own assertion levels defining macros similar to the one above.</p>
  47 <p><span class="bold"><strong>See Also:</strong></span></p>
  48 <p> <a class="link" href="boost_contract/extras.html#boost_contract.extras.assertion_levels" title="Assertion Levels"> Assertion Levels</a>,  <a class="link" href="boost_contract/extras.html#boost_contract.extras.no_macros__and_no_variadic_macros_" title="No Macros (and No Variadic Macros)"> No Macros</a></p>
  49 <p>
  50 </p>
  51 <p>
  52
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  54 <div class="variablelist"><table border="0" class="variablelist compact">
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  60 <td><p><span class="term">Parameters:</span></p></td>
  61 <td><div class="variablelist"><table border="0" class="variablelist compact">
  62 <colgroup>
  63 <col align="left" valign="top">
  64 <col>
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  66 <tbody><tr>
  67 <td><p><span class="term"><code class="computeroutput">cond</code></span></p></td>
  68 <td><p>Boolean contract condition to check. (This is not a variadic macro parameter so any comma it might contain must be protected by round parenthesis and <code class="computeroutput">BOOST_CONTRACT_ASSERT_AUDIT((cond))</code> will always work.) </p></td>
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