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<title>Macro BOOST_CONTRACT_INVARIANT_VOLATILE</title>
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<h2><span class="refentrytitle">Macro BOOST_CONTRACT_INVARIANT_VOLATILE</span></h2>
<p>BOOST_CONTRACT_INVARIANT_VOLATILE &#8212; Program volatile class invariants that can be completely disabled at compile-time. </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<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_macro_hpp" title="Header &lt;boost/contract_macro.hpp&gt;">boost/contract_macro.hpp</a>&gt;

</span>BOOST_CONTRACT_INVARIANT_VOLATILE(...)</pre></div>
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<a name="idm45707992639632"></a><h2>Description</h2>
<p><code class="computeroutput">BOOST_CONTRACT_INVARIANT_VOLATILE</code>({ ... }) expands to code equivalent to the following (note that no code is generated when  <code class="computeroutput"><a class="link" href="BOOST_CO_idm45394999622032.html" title="Macro BOOST_CONTRACT_NO_INVARIANTS">BOOST_CONTRACT_NO_INVARIANTS</a></code> is defined):</p>
<pre class="programlisting"><span class="preprocessor">#ifndef</span> <span class="identifier">BOOST_CONTRACT_NO_INVARIANTS</span>
    <span class="keyword">void</span> <span class="identifier">BOOST_CONTRACT_INVARIANT_FUNC</span><span class="special">(</span><span class="special">)</span> <span class="keyword">const</span> <span class="keyword">volatile</span> <span class="special">{</span>
        <span class="special">...</span>
    <span class="special">}</span>
<span class="preprocessor">#endif</span>
</pre>
<p>Where:</p>
<div class="itemizedlist"><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem"><p><span class="bold"><strong>{ ... }</strong></span> is the definition of the function that checks class invariants for volatile public functions (see <code class="computeroutput"><a class="link" href="BOOST_CONTRACT_INVARIANT.html" title="Macro BOOST_CONTRACT_INVARIANT">BOOST_CONTRACT_INVARIANT</a></code> and  <code class="computeroutput"><a class="link" href="BOOST_CO_idm45394998621472.html" title="Macro BOOST_CONTRACT_STATIC_INVARIANT">BOOST_CONTRACT_STATIC_INVARIANT</a></code>). The curly parenthesis are mandatory. Assertions within this function are usually programmed using  <code class="computeroutput"><a class="link" href="BOOST_CONTRACT_ASSERT.html" title="Macro BOOST_CONTRACT_ASSERT">BOOST_CONTRACT_ASSERT</a></code>, but any exception thrown by a call to this function indicates a contract assertion failure (and will result in this library calling either  <code class="computeroutput"><a class="link" href="boost/contract/entry_invariant_failure.html" title="Function entry_invariant_failure">boost::contract::entry_invariant_failure</a></code> or  <code class="computeroutput"><a class="link" href="boost/contract/exit_invariant_failure.html" title="Function exit_invariant_failure">boost::contract::exit_invariant_failure</a></code>). (This is a variadic macro parameter so it can contain commas not protected by round parenthesis.)</p></li></ul></div>
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<p><span class="bold"><strong>See Also:</strong></span></p>
<p> <a class="link" href="boost_contract/extras.html#boost_contract.extras.disable_contract_compilation__macro_interface_" title="Disable Contract Compilation (Macro Interface)">
        Disable Contract Compilation</a>,  <a class="link" href="boost_contract/extras.html#boost_contract.extras.volatile_public_functions" title="Volatile Public Functions">
        Volatile Public Functions</a> </p>
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<td align="right"><div class="copyright-footer">Copyright &#169; 2008-2019 Lorenzo Caminiti<p>
        Distributed under the Boost Software License, Version 1.0 (see accompanying
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